problem with undefined function or variable

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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
  1 Comment
Stephen23 on 13 May 2017
@best16 programmer: please edit your question and show us the complete error message. This means all of the red text.

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Answers (1)

Star Strider
Star Strider on 13 May 2017
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.
x = 'name of function';
What are you doing with it?
Star Strider
Star Strider on 13 May 2017
I cannot determine what ‘peak’ is with respect to length:
YValue(j) = time(Location)
The problem is that it will return a (1x2) vector for the result of the size call.
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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