Hi all,I want to use matlab to calculate the exponential integral,I know that the official function ExpIntegralE in Mathematica can calculate it.
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As shown in the title, I want to find a relatively authoritative code to calculate exponential integral
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Paul
le 31 Août 2022
ExpIntegralE in Mathematica seems to be the same as the two-argument form of expint in the Symbolic Math Toolbox.
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Paul
le 4 Sep 2022
"there is no official matlab function that is used like expint(n,x), in matlab "
Using the function at the doc page for expint linked above in this Answer
expint(sym(3),sym(5.5))
Get the decimal representation
vpa(expint(sym(3),sym(5.5)))
which is the same result using ExpIntegalE in Mathematica link
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John D'Errico
le 30 Août 2022
Modifié(e) : John D'Errico
le 30 Août 2022
Is there a reason why you would not just use expint?
help expint
Probably you did not look for it. And that was what you did wrong. When you don't know how to do something in MATLAB, LEARN TO USE LOOKFOR. In my case, this identified many possible things, but do you see the 6th item on the list?
lookfor exponential
expmdemo1 - Matrix exponential via Pade approximation.
expmdemo2 - Matrix exponential via Taylor series.
expmdemo3 - Matrix exponential via eigenvalues and eigenvectors.
exp - Exponential.
expm - Matrix exponential.
expint - Exponential integral function.
...
Any guesses what expint would do? The point is, USE LOOKFOR.
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Walter Roberson
le 4 Sep 2022
https://www.mathworks.com/help/symbolic/expint.html is not part of MATLAB???
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