How to solve undefined functions or variables in matlab

#How to solve undefined functions or variables in matlab?

The error page that appeared:

#The first time I came into contact with MATLAB, I thought the function was wrongly written when an error occurred. After checking, I found that it was not the case. I went online. After looking for a way

If the written file is not placed in the current running directory, this error will also occur

After checking the directory, I found that the path is correct

Finally, I found , please pay attention to the naming of the M file written.

The written file name needs to be consistent with the function name,

That is, if the written function is: function [rt,f,g] = twodsin(A,u0,v0,M,N)

Then the file name needs to be set to twodsin.m

Wrong naming method:

The operation after modification is correct:

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