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# Matlab log base e

### How can I write log(e) in MATLAB? - MATLAB Answers

• g languages use log() to indicate log base 10. Excel is the only one I have been able to find. log() or Log[] seems to represent natural log in nearly all languages
• logarithm of base other than e,10 and 2. Follow 590 views (last 30 days) Show older comments. shahid khan on 29 Jul 2012. Vote. 0. ⋮ . Vote. 0. Commented: Stephen Cobeldick on 18 Apr 2020 Accepted Answer: James Tursa. Note that for many MATLAB versions log10 itself called log2 internally.
• Logarithm values, returned as a scalar, vector, matrix, or multidimensional array. For positive real values of X in the interval (0, Inf), Y is in the interval (-Inf,Inf).For complex and negative real values of X, Y is complex. The data type of Y is the same as that of X
• Find the mantissa and exponent of a base-2 logarithm of an input X.The mantissa F and the exponent E satisfy the relation X = F ⋅ 2 E.. Create a symbolic variable a and assume that it is real. Create a symbolic vector X that contains symbolic numbers and expressions. Find the exponent and mantissa for each element of X
• One of the nice things about the Matlab doc, it that at the bottom of the page there are links to similar functions, so if Google gets you to exp, the 'See Also' gets to to log and log10. I'm sorry if I sounded a bit snarky btw
• In Matlab, we use a log plot to plot the graphs in logarithmic scales in both horizontal and vertical axes. There are various syntaxes that are used to plot the numbers based on their nature whether it is a real or complex number. Start Your Free Data Science Course

Any base can be used for logarithm, though most common are 10, e and 2. Applications of Log Scale Plot. Log scale plots are efficiently used in analyzing earthquakes, PH of solution and audio signals. These plots help us to see large range quantities in a small plane. Types of log plots in MATLAB. There are two types of log plots in MATLAB: Log. In this Tutorial I will explain how to write solve Exponential and Logarithmic Functions using exp() and log() command.For Arithmetic operations and examples..

The natural logarithm of a number is its logarithm to the base of the mathematical constant e, where e is an irrational and transcendental number approximately equal to 2.718281828459. The natural logarithm of x is generally written as ln x, log e x, or sometimes, if the base e is implicit, simply log x In Matlab, we use real log function to find the natural logarithm of each element present in an array. Please find the below example depicting how natural logarithm is used in arrays: X= reallog(y) Here y is the input argument which is an array and X gives the natural logarithm of each element present in y

### logarithm of base other than e,10 and 2 - MATLAB Answers

The MATLAB M-file used to create this plot is experr.m. X-axis log scale. To create a plot with a linear scale on the x-axis and a log (base 10) scale on the x-axis you can use the function semilogx. Log scale on both axes. To create a plot using a log (base 10) scale for both the x-axis and and the y-axis you can use the function loglog I used Wolfram Alpha to solve the equation, and the result is: a = b-x*W (- ( (c-d)*exp (d/x-c/x))/x) where W is the is the product log function (Lambert W function). It might be easier to see it at the Wolfram Alpha page. I used the Matlab's built-in lambertW function to solve the equation. This is rather slow, and is the bottleneck in my script

The natural logarithm function in MATLAB is log (). To calculate the natural logarithm of a scalar, vector or array, A, enter log (A). Log (A) calculates the natural logarithm of each element of A when A is a vector or array. The natural logarithm has base e, which is approximately 2.718. Applying the log () function to a number, A, solves the. There are other functions such as ' semilogx ' and ' semilogy ' which have one axis in linear scale and the other axis in logarithmic scale. 1.-. Create a plot using a logarithmic scale for both the x-axis and the y-axis (loglog): clear; clc; close all. % Define your independent variable. t = 0 : 2*pi/360 : 2*pi; % Define values along your x-axis The natural logarithm of a number is its logarithm to the base of the mathematical constant e, which is an irrational and transcendental number approximately equal to 2.718 281 828 459.The natural logarithm of x is generally written as ln x, log e x, or sometimes, if the base e is implicit, simply log x. Parentheses are sometimes added for clarity, giving ln(x), log e (x), or log(x) log base 10, log base 10 matlab, log base 2, log base e, matlab log base 10, python log base 2. Recent posts. April 26, 2018 B cell subsets in the lungs: What are they? April 26, 2018 Explore 10X Visium Spatial Transcriptomics data at ease with BioTuring Browser April 26, 2018 A tiny world inside non-small cell lung cancer revealed by single.

Math Tutor Series for Matlab Programming MATLAB Function Reference : log2. Base 2 logarithm and dissect floating-point numbers into exponent and mantissa. Syntax. Y = log2(X) [F,E] = log2(X) Description. Y = log2(X) computes the base 2 logarithm of the elements of X. [F,E] = log2(X) returns arrays F and E. Argument F is an array of real values, usually in the range 0.5 <= abs(F) < 1 A), or if you analogously directly define the matrix logarithm with base 2 via an eigendecomposition with the standard logarithm of base 2 applied eigenvalue-wise, then you can obtain a corresponding base 2 matrix logarithm by dividing by log (2): A = logm (B) ./ log (2) Share. Improve this answer. answered Jan 8 '17 at 1:08 View MATLAB Command. Dissect several numbers into the exponent and mantissa. These operations all follow standard IEEE® arithmetic. Create a vector X that contains several test values. Calculate the exponent and mantissa for each number. X = [1 pi -3 eps realmax realmin]; format rat [F,E] = log2 (X) F = Columns 1 through 5 1/2 355/452 -3/4 1/2. Octave / MATLAB Computing logarithms In MATLAB (and Octave) log() computes natural logarithms. >> e = exp(1) e = 2.7183 >> log(e) ans = 1 >> syms x t >> int(1/t, 1, x) ans = log(x) >> diff( log(x) ) ans = 1/x If you need to compute a common (base 10) log use log10(). >> log10( 100 ) ans = E is defined as a mathematical constant (2.718281828459). The nomenclature for the natural logarithm of x is usually written as ln x, log e x.. The natural logarithm of x, is the power to which e would have been raised to, in order to generate that original number. All positive real numbers have a natural logarithm function logarithm of base other than e,10 and 2. Follow 610 views (last 30 days) Show older comments. shahid khan on 29 Jul 2012. Vote. 0. ⋮ . Vote. 0. Commented: Stephen Cobeldick on 18 Apr 2020 Accepted Answer: James Tursa. Note that for many MATLAB versions log10 itself called log2 internally. logarithm of base other than e,10 and 2. Follow 650 views (last 30 days) Show older comments. shahid khan on 29 Jul 2012. Vote. 0. ⋮ . Vote. 0. Commented: Stephen Cobeldick on 18 Apr 2020 Accepted Answer: James Tursa. Note that for many MATLAB versions log10 itself called log2 internally.

Input matrix, specified as a scalar, vector, matrix, or multidimensional array. For floating-point number dissection [F,E] = log2 (X) , any zeros in X produce F = 0 and E = 0. Input values of Inf , -Inf, or NaN are returned unchanged in F with a corresponding exponent of E = 0. Data Types: single | double Exp() will only be an inverse of Log() if Log() is the natural logarithm. If your Log() is using a different base (base 2, base 10, any other arbitrary base), then you will need to use the different base in place of e in Exp() The number e frequently occurs in mathematics (especially calculus) and is an irrational constant (like π).Its value is e = 2.718 281 828. Apart from logarithms to base 10 which we saw in the last section, we can also have logarithms to base e.These are called natural logarithms.. We usually write natural logarithms using `ln`, as follows: `ln x` to mean `log_e x` (that is, `log x` to. In this article. Returns a Double specifying the natural logarithm of a number.. Syntax. Log(number). The required number argument is a Double or any valid numeric expression greater than zero.. Remarks. The natural logarithm is the logarithm to the base e.The constant e is approximately 2.718282.. You can calculate base-n logarithms for any number x by dividing the natural logarithm of x by.

### Natural logarithm - MATLAB lo

1. 10.4 Matrix Exponential 505 10.4 Matrix Exponential The problem x′(t) = Ax(t), x(0) = x0 has a unique solution, according to the Picard-Lindel¨of theorem. Solve the problem n times, when x0 equals a column of the identity matrix, and write w1(t) wn(t) for the n solutions so obtained.Deﬁne th
2. The natural logarithm function in MATLAB is log (). To calculate the natural logarithm of a scalar, vector or array, A, enter log (A). Log (A) calculates the natural logarithm of each element of A when A is a vector or array. The natural logarithm has base e, which is approximately 2.718. Applying the log () function to a number, A, solves the.
3. MATLAB TUTORIAL- How MATLAB log10 gives base 10 logarith
4. DO 5. (25 points) The natural logarithm (with base e) has Maclaurin series X2 X3 In(1 + x) = X - + 2 3 = 1 You are asked to write your own user defined function to compare Matlab built-in natural log function. The Matlab built-in function is: Yexact = log (1+x) a
5. The mode is the point of global maximum of the probability density function. In particular, by solving the equation (⁡) ′ =, we get that: ⁡ [] =. Since the log-transformed variable = ⁡ has a normal distribution, and quantiles are preserved under monotonic transformations, the quantiles of are = + = (),where () is the quantile of the standard normal distribution
6. base e made the normal logarithm a natural logarithm. Therefore, to quench the curiosity of many others like me, I will show through this paper that why e is the correct choice for the base of exponential and natural logarithm functions. I shall also be exploring the most important property of e, via this paper
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### Base-2 logarithm of symbolic input - MATLAB log

Description. Y = log10 (X) returns the common logarithm of each element in array X . The function accepts both real and complex inputs. For real values of X in the interval (0, Inf ), log10 returns real values in the interval ( -Inf , Inf ). For complex and negative real values of X, the log10 function returns complex values I need to calculate 'log base e(ln)' in matlab.how to use it ?. Thanks in advance. 0 Comments. Show Hide -1 older comments. Sign in to comment. Sign in to answer this question. Answers (1) the cyclist on 18 Jan 2013. Vote. 2. Link • ln0(z) —Returns the natural logarithm (base e) of z, but returns -1×10 307 at z = 0. Arguments • z is a dimensionless scalar (real, complex, or imaginary), or a vector of scalars. For functions log and ln, z cannot be zero. If z is a vector, then none of its elements can be a zero

semilogx (X,Y) plots x - and y -coordinates using a base-10 logarithmic scale on the x -axis and a linear scale on the y -axis. To plot a set of coordinates connected by line segments, specify X and Y as vectors of the same length. To plot multiple sets of coordinates on the same set of axes, specify at least one of X or Y as a matrix exp(x) Exponential (base e) log(x) Logarithm (base e) log10(x) Logarithm (base10) Operators and programming with MATLAB. Most programming scripts make frequent use of if statements. Every if statement must be followed by the end keyword Then log[B](x) = log[e](x) * log[e](B) which is a constant multiple relative to log[e] . The constant multiple would alter how much height the graph would need, but as a magnification, not as a change to the shape of the graph. And the size available to plot into is fixed, so MATLAB is just going to rescale anyhow.. Solve this problem in both MATLAB and EXCEL. 20 points for MATLAB solution, 10 points for Excel solution. Prove that the log of a product is equal to the sum of the logs. Prove this for the natural logarithm [base e). Do not use an approximation for e, use the exact value. Your proof should use at least 10 different values of a and b

### How to calculate the value of natural log 'e' in Matlab

1. Prove this for the natural logarithm [base e]. Do not use an approximation for e, use the exact value. Your proof should use at least 10 different values of a and b. Question: Question 3 30 pts Solve this problem in both MATLAB and EXCEL. 20 points for MATLAB solution, 10 points for Excel solution. Prove that the log of a product is equal to.
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3. MATLAB TUTORIAL- How MATLAB log function gives natural logarithm (ln
4. The basic idea. A logarithm is the opposite of a power. In other words, if we take a logarithm of a number, we undo an exponentiation. Let's start with simple example. If we take the base b = 2 and raise it to the power of k = 3, we have the expression 2 3. The result is some number, we'll call it c, defined by 2 3 = c
5. Getting Help 1. The help Command This is the easiest way to find out more about specific Matlab commands. The command help name > gives information about the Matlab command name > . help sin % Information about sine.help i % Information about i.help log % Information about log (base e) By itself, help gives a list of topics in Matlab. To explore the topic 'elementary functions', use the.
6. Prove that the log of a product is equal to the sum of the logs. Prove this for the natural logarithm [base e]. Do not use an approximation for e, use the exact value. Your proof should use at least 10 different values of a and b. In(ab) = In(a) + ln(b) For the EXCEL solution, explain on the worksheet how you solved this problem
7. MATLAB Function Reference : log. Natural logarithm. Syntax. Y = log(X) Description. The log function operates element-wise on arrays. Its domain includes complex and negative numbers, which may lead to unexpected results if used unintentionally. Y = log(X) returns the natural logarithm of the elements of X

### Log Plot Matlab Examples to Use Log and semilogx in Matla

MATLAB will execute the above statement and return the following result − ans = 0.8147 0.9134 0.2785 0.9649 0.9572 0.9058 0.6324 0.5469 0.1576 0.4854 0.1270 0.0975 0.9575 0.9706 0.800 In a semilogarithmic graph, one axis has a logarithmic scale and the other axis has a linear scale.. In log-log graphs, both axes have a logarithmic scale.. The idea here is we use semilog or log-log graph axes so we can more easily see details for small values of y as well as large values of y.. You can see some examples of semi-logarithmic graphs in this YouTube Traffic Rank graph %e Format as a floating point value in scientific notation. %g Format in the most compact form: %f or %e. \n Insert a new line in the output string. \t Insert a tab in the output string. Numeric Display Formats format short Four decimal digits (default). format long 16 decimal digits. format short eFive digits plus exponent Let's make the plot from x = 0.1 to x = 5 in steps of 0.1 (remembering that in MATLAB the command for the natural logarithm is log) x = .1:.1:5; plot(x,x-2-log(x)) From the plot, it is clear that the curve x-2-ln(x) crosses zero at two points in the range of x values being displayed. Zooming into the plot (using the magnifying glass icon.

### MATLAB Log Plot: Loglog and Everything You Need to Know

In MATLAB the function exp(x) gives the value of the exponential function e x. Likewise, what is LN equal to? The natural logarithm of a number is its logarithm to the base of the mathematical constant e, where e is an irrational and transcendental number approximately equal to 2.718281828459 The polynomials, exponential function e x, and the trigonometric functions sine and cosine, are examples of entire functions. Examples of functions that are not entire include the square root, the logarithm, the trigonometric function tangent, and its inverse, arctan. For these functions the Taylor series do not converge if x is far from b The natural logarithm of a number is its logarithm to the base of the mathematical constant e, where e is an irrational and transcendental number approximately equal to 2.718 281 828 459.The natural logarithm of x is generally written as ln x, log e x, or sometimes, if the base e is implicit, simply log x. Parentheses are sometimes added for clarity, giving ln(x), log e (x), or log(x) How do you do Ln in Matlab? The function for ln in matlab is just log. So ln(2) is just log(2). There are some other functions for other bases such as log10, for the usual log base 10. I think for bases other than e, 10, and 2 you have to use the change of base formula. How do you separate real and imaginary parts

### MATLAB Tutorial#3 How to solve Exponential and Logarithmic

• Tag Archives: matlab log base 10. April 26, 2018 November 9, 2020 By biomembers. Log base 2 or e or 10? # Data visualization and analysis. When your data span a large range, the graphs tend to get ugly. Values either crowd at the bottom or spread out at the top — a problem called poor resolution. The rate of changes is hard to display, since.
• Basic properties of the logarithm and exponential functions • When I write log(x), I mean the natural logarithm (you may be used to seeing ln(x)). If I specifically want the logarithm to the base 10, I'll write log 10. • If 0 < X < ∞, then -∞< log(X) < ∞. You can't take the log of a negative number

MATLAB: Least squares Exponential fit using polyfit exponential least squares polyfit Let's say I'm given x=[11,60,150,200] and y=[800,500,400,90] These are just random numbers (but imagine the solution is in the form of y=a*exp(b*t Logarithm Base Change. If the logarithm to the base a is known, then the logarithm to the base b can be obtained by the base change relationship: This can be proved from the definition and combination rules for logarithms. If . then . and rearranging gives. The most common base changes are from the natural log to base 10 log or vice versa lnN - ln N o = Kt - 0, or ln(N/N o) = Kt, or N = N o e Kt. We can calculate the constant K by considering the time interval over which N o has doubled. This time is the doubling time, t D. For that condition: N/N o = 2 = e KtD. Taking the natural logarithm of both sides: ln2=Kt D, or K=ln2/t D, exactly as above. In summary

1. The difference between log and ln is that log is defined for base 10 and ln is denoted for base e.For example, log of base 2 is represented as log 2 and log of base e, i.e. log e = ln (natural log). A natural logarithm can be referred to as the power to which the base 'e' that has to be raised to obtain a number called its log number
2. LaTeX forum ⇒ Math & Science ⇒ Logarithm with Base 10. Information and discussion about LaTeX's math and science related features (e.g. formulas, graphs). 6 posts • Page 1 of 1. ghostanime2001 Posts: 402 Joined: Fri May 20, 2011 7:41 am. Logarithm with Base 10
3. Compute the base-10 logarithm of each element of x. See also: log, log2, logspace, exp. Mapping Function: log2 (x) Mapping Function: [f, e] = log2 (x) Compute the base-2 logarithm of each element of x. If called with two output arguments, split x into binary mantissa and exponent so that 1/2 <= abs(f) < 1 and e is an integer. If x = 0, f = e = 0

Details. Log is a mathematical function, suitable for both symbolic and numerical manipulation. Log gives exact rational number results when possible. For certain special arguments, Log automatically evaluates to exact values. Log can be evaluated to arbitrary numerical precision The Natural Logarithm. The common logarithm is used in many scientific applications, such as the Richter scale. In mathematics, the most commonly used base for logarithms is the number e = 2.718281828... log e is abbreviated to ln (read lin) though Matlab uses log for this function. Thus, by definition y = e x ln y =

At first one should know that log stands for Common Logarithm with a base 10, whereas ln stands for Natural Logarithm with the base e The following problems involve the integration of exponential functions. We will assume knowledge of the following well-known differentiation formulas : , where , and. , where a is any positive constant not equal to 1 and is the natural (base e) logarithm of a . These formulas lead immediately to the following indefinite integrals Ln is just log with a base of e. For example, ln(e²) = 2, because e raised to the second power gives you e². Log could have any base as long as it's specified. This is usually represented by a subscript under the log. Unfortunately, I don't have t.. I am trying to find the syntax for ln(x) in matlab but nothing works. Anyone has an idea? You can calculate a log for any base with log(x)/log(base). Since log calculates the natural logarithm, log(exp(1)) is 1. So the comment is correct, it is just needlessly convoluted The logarithm of a product is the sum of the logarithms of the factors. log a xy = log a x + log a y. Quotient Rule The logarithm of a quotient is the logarithm of the numerator minus the logarithm of the denominator. log a = log a x - log a y. Power Rule ; log a x n = nlog a x. Change of Base Rule ; where x and y are positive, and a > 0, a ≠

### MATLAB Lesson 10 - More on plot

• Purplemath. There is one other log rule, but it's more of a formula than a rule. You may have noticed that your calculator only has keys for figuring the values for the common (that is, the base-10) log and the natural (that is, the base-e) log.There are no keys for any other bases
• y = C e-kt, k > 0. Features. Asymptotic to y = 0 to right; Passes through (0,C) C is the initial value; Decreasing, but bounded below by y=0; Notes. Exponential decay and be used to model radioactive decay and depreciation. Exponential decay models decrease very rapidly, and then level off to become asymptotic towards the x-axis
• Compute the base-2 logarithm of each element of x . If called with two output arguments, split x into binary mantissa and exponent so that 1/2 <= abs (f) < 1 and e is an integer. If x = 0, f = e = 0 . See also: pow2, log, log10, exp . pow2 (x) pow2 (f, e) With one input argument, compute 2 .^ x for each element of x

Calculate the natural logarithm with math. natural logarithm can be calculated using the python module called math: >>> import math >>> math.e 2.718281828459045 >>> e = math.e >>> math.log(e) 1.0 Calculate the natural logarithm with nump Math. Advanced Math. Advanced Math questions and answers. 4a) How do we ensure trigonometric functions compute values appropriately? 4b) Explain the difference between the commands or log base 10 as a function of x and log base e as a function of x in Matlab. Include the commands. I R/S-Plus MATLAB/Octave Description; help.search('plot') lookfor plot: Search help files: apropos('plot') Find objects by partial name: library() help: List available. MATLAB Function Reference : log10. Common (base 10) logarithm. Syntax. Y = log10(X) Description. The log10 function operates element-by-element on arrays. Its domain includes complex numbers, which may lead to unexpected results if used unintentionally. Y = log10(X) returns the base 10 logarithm of the elements of X

### logarithm - Matlab: Solving a logarithmic equation - Stack

• The change of base rule. We can change the base of any logarithm by using the following rule: Created with Raphaël. Notes: When using this property, you can choose to change the logarithm to any base . As always, the arguments of the logarithms must be positive and the bases of the logarithms must be positive and not equal to in order for this.
• E.g., if P transition matrix for 1 year, P(1=12) = e 12 1 logP P1=12 is matrix for 1 month. Problem: logP, P1=k may have wrong sign patterns ) regularize. University of Manchester Nick Higham Matrix Logarithm 18 / 4
• Natural Logarithms: Base e Another base that is often used is e (Euler's Number) which is about 2.71828. This is called a natural logarithm. Mathematicians use this one a lot. On a calculator it is the ln button. It is how many times we need to use e in a multiplication, to get our desired number
• You can enter the function log with base b using either the 1-D or 2-D calling sequence. The base can be entered as an index or as the second argument. Similarly, e can also be entered as exp(1) in 1-D. See exp for more about the exponential function
• g long symbolic expressions to use in matlab ode45? Recent Insights Ha hecho clic en un enlace que corresponde a este comando de MATLAB: Ejecute el comando introduciéndolo en la ventana de comandos de MATLAB. Los navegadores web no admiten comandos de MATLAB Exponents and Logarithms. Exponential, logarithm, power, and root functions. In addition to common functions like exp and log, MATLAB ® has several other related functions to allow flexible numerical calculations. The expm1 and log1p functions compensate for numerical round-off errors in small arguments, while the reallog, realpow, and. What is MATLAB? MATLAB abbreviated form of 'Matrix Laboratory' is proprietary software, widely used by students, engineers, scientists, etc. for various types of mathematical computations. It has been developed by MathWorks. The most important aspect of this software is MATLAB programming language which is a matrix-based language. Like any other high-level programming language, MATLAB also. The Euler-Mascheroni constant (also called Euler's constant) is a mathematical constant recurring in analysis and number theory, usually denoted by the lowercase Greek letter gamma (γ).. It is defined as the limiting difference between the harmonic series and the natural logarithm, denoted here by : = → (⁡ + =) = (+ ⌊ ⌋). Here, ⌊ ⌋ represents the floor function I know it's an old question but as I didn't find a good answer when I was trying to do it so I will write my solution for others. First there is no implemented function to do ln operation in matlab, but we can make it. just remember that the chang..

The Box-Cox transformation is a family of power transformations. The logarithm is the natural logarithm (log base e). The algorithm calls for finding the λ value that maximizes the Log-Likelihood Function (LLF). The search is conducted using fminsearch. [transdat,lambda] = boxcox (data) transforms the data vector data using the Box-Cox. Description. newfts = log2 (tsobj) calculates the base 2 logarithm of the data series in a financial time series object tsobj. It returns another time series object newfts containing the logarithms. Run the command by entering it in the MATLAB Command Window. Web browsers do not support MATLAB commands

The Matlab Hilbert transform operates on one-dimensional data. For the work described here, it is necessary to adapt the HT to two-dimensional data. I do this by analogy to the two-dimensional Fourier Transform (strictly, the discrete Fourier Transform). Basic equations (e.g. Lim, 1990) show that the two-dimensional discrete Fourie Logarithms A logarithm is fundamentally an exponent applied to a specific base to yield the argument .That is, .The term ``logarithm'' can be abbreviated as ``log''. The base is chosen to be a positive real number, and we normally only take logs of positive real numbers (although it is ok to say that the log of 0 is ).The inverse of a logarithm is called an antilogarithm or antilog; thus, is. Log[ z ] (565 formulas) Visualizations (228 graphics, 1 animation) Plotting : Evaluatio Quaternion toolbox for Matlab is a toolbox that extends Matlab to handle matrices of quaternions with real and complex components. Many Matlab operators and functions are overloaded to work for real quaternion and complexified quaternion matrices. Version 2 of the toolbox adds support for octonions. Version 3 adds symbolic computation with.

1. log (a, (Base)) : This function is used to compute the natural logarithm (Base e) of a. If 2 arguments are passed, it computes the logarithm of desired base of argument a, numerically value of log (a)/log (Base). Syntax : math.log (a,Base) Parameters : a : The numeric value Base : Base to which the logarithm has to be computed You can calculate a log for any base with log(x)/log(base). Since log calculates the natural logarithm, log(exp(1)) is 1. So the comment is correct, it is just needlessly convoluted Anti-logarithm calculator. In order to calculate log-1 (y) on the calculator, enter the base b (10 is the default value, enter e for e constant), enter the logarithm value y and press the = or calculate button: = Calculate × Rese Returns the natural logarithm of x. The natural logarithm is the base-e logarithm: the inverse of the natural exponential function ( exp ). For common (base-10) logarithms, see log10. C99. C++98. C++11. Header <tgmath.h> provides a type-generic macro version of this function. This function is overloaded in <complex> and <valarray> (see complex. MATLAB can store values in variables. Variables are case sensitive and some variables are reserved by MATLAB (e.g. pi stores 3.1416), Variable Editor can be used to enter or manipulate matrices, The coefficients of simultaneous linear equations and polynomials are used to form a row vector. MATLAB then can be used to solve the equations     