The log function does exactly what you want.
log(14 - y)
If you want a base 10 log, you use log10. There is also a log2 function, which gives a base 2 log. Other bases are achieved using the simple relation
log(X)/log(b)
produces a log to the base b. You could write a function for it as:
logb = @(X,b) log(X)/log(b);
logb(9,3)
ans =
2
which is as expected.
Finally, there is the reallog function, which also does the natural log, but it produces an error when the log would have been a complex number.
log(-2)
ans =
0.693147180559945 + 3.14159265358979i
reallog(-2)
Error using reallog
Reallog produced complex result.
But for the more normal case, reallog does the same thing as log.
log(2)
ans =
0.693147180559945
reallog(2)
ans =
0.693147180559945 Answer from John D'Errico on mathworks.com
Quora
quora.com › How-can-I-implement-log-ln-and-e-in-MATLAB
How to implement log, ln, and e in MATLAB - Quora
MATLAB already provides the standard ... environments), here are concise, reliable approaches. ... Natural log: log(x) returns ln(x) (base e)....
Videos
MathWorks
mathworks.com › matlabcentral › answers › 1465394-how-do-i-calculate-a-logarithm-of-a-variable-base
How do I calculate a logarithm of a variable base? - MATLAB Answers - MATLAB Central
October 2, 2021 - I saw that calculating log of the base of 10 or e is possible. for an example: after typing log (a,b) - I recieve an ERROR message. I'd like to use "a" as a varying number and change it using a loop until I'll get a good result. "a" can be for an example - 1.05, 1.003.... ... Too many input arguments. ... Sign in to comment. Sign in to answer this question. ... https://www.mathworks.com/matlabcentral/answers/1465394-how-do-i-calculate-a-logarithm-of-a-variable-base#answer_800204
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Matlab log | Learn the different examples of Matlab log
March 8, 2023 - This is how our input and output will look like in the Matlab command window: ... As we can see in the output, we have the log of 4 to the base “e” as 1.3863, which is the same as expected by us.
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Exponents and Logarithms - MATLAB & Simulink
This example shows an interesting graphical approach for discovering whether e^pi is greater than pi^e. You clicked a link that corresponds to this MATLAB command:
MathWorks
mathworks.com › matlabcentral › answers › 59158-how-to-represent-ln-in-matlab
how to represent ln in matlab? - MATLAB Answers - MATLAB Central
January 18, 2013 - The log() function is base-e log. So, to take log of x [mathematicians would usually say ln(x)], just do ... Say more. Does it error (and if so what is the FULL text of the error message)?
MathWorks
mathworks.com › matlabcentral › answers › 431232-how-to-calculate-the-value-of-natural-log-e-in-matlab
How to calculate the value of natural log 'e' in Matlab? - MATLAB Answers - MATLAB Central
November 21, 2018 - https://www.mathworks.com/matl...f-natural-log-e-in-matlab#comment_640660 ... Thanks. It worked. God bless you. ... Sign in to comment. Sign in to answer this question. Find more on Google in Help Center and File Exchange ... Find the treasures in MATLAB Central and discover how the community can help you! Start Hunting! ... Choose a web site to get translated content where available and see local events and offers. Based on your location, ...
Quora
quora.com › How-do-I-use-natural-logarithm-ln-in-matlab
How to use natural logarithm (ln) in matlab - Quora
Answer (1 of 18): 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.
Top answer 1 of 2
4
The natural log in MATLAB is simply log(x). You're mixing the two:
- log in MATLAB
- log in MuPAD
The error message you get is because the function is not defined. You'll get the same error for this line:
bogus_function(1.23)
??? Undefined function or method 'bogus_function' for input arguments
of type 'double'.
2 of 2
0
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 change formula for log base is
log b (X)= log a (X)/log a (B)
you can check this easily.
if you want to calculate log 2 (8) then what you need to do is to calculate log 10 (8)/log 10 (2) you can find that: log 2 (8) = log 10 (8)/log 10 (2) = 3 So easily if you want to calculate ln(x), all you need is to change the base to the e.
ln(x) = log 10 (x)/log 10 (e)
so, just write that code in matlab
my_ln= log 10 ( number ) / log 10 ( exp(1) );
you can also make it as a function and call it whenever you need it,
function [val] = ln_fun(number)
val = log 10 (number)/ log 10 ( exp(1) );
end
*remember the log general formula → log base (number)
MathWorks
mathworks.com › matlab › mathematics › elementary math › exponents and logarithms
log - Natural logarithm - MATLAB
This MATLAB function returns the natural logarithm ln(x) of each element in array X.
Brainly
brainly.com › mathematics › high school › match the following matlab command to its mathematical meaning:
1. log(x)
- a. log base e of x
2. log10(x)
- b. log base 10 of x
3. not a valid matlab command
- c. (log base d of x)/(log base d of b)
[FREE] Match the following MATLAB command to its mathematical meaning: 1. log(x) - A. log base e of x 2. - brainly.com
January 31, 2023 - ... In MATLAB, the command 'log(x)' represents the natural logarithm (log base e), 'log10(x)' represents the common logarithm (log base 10), and the option indicating 'Not a valid MATLAB command' correctly relates to a logarithmic formula.