problem with undefined function or variable

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best16 programmer 2017-5-13

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评论： Star Strider 2017-5-13

i have this problem i don't know if matlab going mad :

Undefined function or variable 'name of function'

for the first time it works perfectly but after i close matlab and re-open it ,it gives that error.

can you help me with that

thank you

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Stephen23 2017-5-13

@best16 programmer: please edit your question and show us the complete error message. This means all of the red text.

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Star Strider 2017-5-13

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Without seeing your code, it is not possible to determine the problem. If 'name of function' is a variable (character array), there should be no problem.

Example:

x = 'name of function';

What are you doing with it?

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best16 programmer 2017-5-13

thanks for the answers,but that same code works for the first time

Star Strider 2017-5-13

在 MATLAB Online 中打开

I cannot determine what ‘peak’ is with respect to length:

            YValue(j) = time(Location)
            value=YValue'

The problem is that it will return a (1x2) vector for the result of the size call.

So:

peak = 1:42;
v = 10:size(peak)-4
v =
  1×0 empty double row vector

That will not work, since plot expects vector arguments, and ‘empty’ vectors do not fulfill that requirement.

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