Undefined function periodgram for input arguments of type double?

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nines 2022-6-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1742740-undefined-function-periodgram-for-input-arguments-of-type-double

评论： Star Strider 2022-6-18

采纳的回答： Star Strider

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Hello!

I am trying to use the function periodgram in order to plot a timeseries (x) which was an 100x4 matrix.

Fs = 400
x = x(:,1)
[PSD, normalized_frequency] = periodgram(x,Fs)

I am getting the following error:

Error in periodogram (line 202)
if any([signal.internal.sigcheckfloattype(x1,'single','periodogram','X')...
 
Undefined function 'periodgram' for input arguments of type 'double'.
      
end

when I went to go look at the documentation, I got this message:

Input X in periodogram must be double/single, instead it was char.

Which seems to be giving mixed messages.

I tried the following:

%1) converting double to single
x = x(:,1);
x = single(x);
[PSD, norm_frequency] = periodgram(x, Fs)

Do you have any suggestions?

Thanks so much.

采纳的回答

Star Strider 2022-6-17

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1742740-undefined-function-periodgram-for-input-arguments-of-type-double#answer_987865

It would be nice to know what ‘x’ is.

If it is a table, the reference should be:

x{:,1}

(note the curly braces {}) instead.

I would just like to send along a huge thank you -- honestly, my thesis would be not nearly where it is without your help and all of the nice senior people at matlab answers. I was reading a lot of your answers on matlab and am just so impressed and so grateful at all of your time and dedication to this; thanks a ton. :)