Problem with findpeaks - error message of 'undefined variable "coder"'

Question

Seth 2014-8-28

2
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/152692-problem-with-findpeaks-error-message-of-undefined-variable-coder

评论： Image Analyst 2014-8-29

I am trying to use the findpeaks function out of the signal processing toolbox. When I enter something like...

data = [1 15 4 2]
[pks,local] = findpeaks(data)

...I get

Undefined variable "coder" or class "coder.target".
Error in findpeaks>parse_inputs (line 99)
if coder.target('MATLAB')
Error in findpeaks (line 71)
[X,Ph,Pd,Th,Np,Str,infIdx] = parse_inputs(Xin,varargin{:});
99  if coder.target('MATLAB')

I am running Matlab 2014a with signal & stats & mapping toolboxes & have confirmed that I am pointing to the correct findpeaks function via "which -all findpeaks"

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Answer 1

AJ von Alt 2014-8-29

1
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https://ww2.mathworks.cn/matlabcentral/answers/152692-problem-with-findpeaks-error-message-of-undefined-variable-coder#answer_150210

在 MATLAB Online 中打开

This looks like it might be a path issue. Try:

restore defaultpath
savepath
rehash toolboxcache

and restart MATLAB.

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Seth 2014-8-29

That worked; thanks, AJ!!!

Image Analyst 2014-8-29

I'm really baffled as to why that worked since you said you "have confirmed that I am pointing to the correct findpeaks function via "which -all findpeaks"" Did you ever find out why that worked? Did you have your own function you wrote called coder()????

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Answer 2

Star Strider 2014-8-28

0
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https://ww2.mathworks.cn/matlabcentral/answers/152692-problem-with-findpeaks-error-message-of-undefined-variable-coder#answer_150129

在 MATLAB Online 中打开

I’m a bit concerned about ‘...something like...’.

What returns when you run:

ac = class(data)

where ‘data’ is your argument to findpeaks.

If that comes back as double, I’m out of ideas and I’ll delete this.

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Seth 2014-8-28

ac = class(data) (where data = [1 10 2 6 5 11])

does come back as double. Thanks anyway!

Star Strider 2014-8-28

It may be time to put in a Support Request to TMW.

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Answer 3

Image Analyst 2014-8-29

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/152692-problem-with-findpeaks-error-message-of-undefined-variable-coder#answer_150139

在 MATLAB Online 中打开

For me it runs fine and gives:

data =
     1    15     4     2
pks =
    15
local =
     2

Try putting a "clear all" before your code and try again. I don't have the mapping toolbox, or the MATLAB Coder toolbox either. What toolboxes are listed when you do "ver"?