How to calculate expm of a matrix?

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Omar B.
Omar B. 2020-6-21
评论： madhan ravi 2020-6-22
Hi all, I am trying to run the following but I got an erorr
Error in expm
if ~all(isfinite(A),'all')
How can I fix that error?
H=[ 0.650 0.202 0 0 0 0 0 0 0;0.202 0.650 -0.164 0.066 0 0 0 0 0;0 -0.168 0.779 0.165 0 0 0 0 0;0 0.066 0.165 0.648 -0.164 0.064 0 0 0;0 0 0 -0.164 0.776 0.164 0 0 0;0 0 0 0.064 0.164 0.649 0.168 0.051 0;0 0 0 0 0 0.168 0.547 0.168 0;0 0 0 0 0 0.051 0.168 0.650 -0.168;0 0 0 0 0 0 0 -0.168 0.547];
w=expm(H)
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Walter Roberson
Walter Roberson 2020-6-22
Having that error message earlier would have helped a lot.

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采纳的回答

Steven Lord
Steven Lord 2020-6-22
You've written your own script all.m that's being called instead of the all function built into MATLAB. Rename or remove your file /Users/jga/Documents/MATLAB/all.m so MATLAB can call the built-in function.

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madhan ravi
madhan ravi 2020-6-21
clear expm
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Walter Roberson
Walter Roberson 2020-6-22
In MATLAB, when an error occurs, you are given an indication of which routine the error occurred in.
When the error occurs in a built-in function or a .p function or inside Simulink, then the error message just tells you which function the problem occurred in, and in that case always excludes the line of code that triggered the error.
When the error occurs in .m code, then (except for some cases involving caught errors that are re-thrown) the error always includes the line of code that the problem occurred on and includes an indication showing the line number in the code.
You show us a line of code that apparently triggered the error. In such a case, you would have been told the line number of the error. But you claim that you have shown us the entire error message.
Either you are mistaken about what you posting being the entire error message, or else your MATLAB is badly corrupted and needs to be reinstalled.
Omar B.
Omar B. 2020-6-22
I understand, it was working before I update Matlab from 2017 to 2020. I do not know where is the problem.

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