How to check the algorithm of the internal functions?

Hello,

I am trying to figure out the internal algorithm of "stft()". I typed "edit stft" at command window. Then I got the whole script of "stft()". However, there is another internal function called "computeDFT" (as showed in the picture 1). With the help of the command "edit computeDFT" I can not get access of this function (as showed in the picture 2). Does anybody know how to check the whole script of the function "computeDFT()" here?

(picture 1)

(picture 2)

Many Thanks!

Yuantong

[KALYAN ACHARJYA]

It's perfectly OK in my case (MATLAB 2020a)

[Image Analyst]

use set path on the home tab of the tool ribbon to set a path to that folder

[Yuantong Li]

Thanks for your answers!

I tried again, and I got this warning. stft() is a built-in function. In stft(), there is also a built-in function called computeDFT() (red in picture). In the documentation I can not find it. Or there is no way for user to get the script for computeDFT()?

@ KALYAN ACHARJYA: I am very grateful, if you could upload a screenshot for the script of computeDFT(). However, I do not know how you get it.

[KALYAN ACHARJYA]

[Yuantong Li]

By right klicking on "computeDFT" I got the code I wanted. Thanks for your all helping!

Answer 1

[Steven Lord]

computeDFT is a private function in the same directory as the stft.m file. As such it is intended only be called by code in that same directory. If you select the call in that file, right-click on it, and select to open the file MATLAB will look for that function "in the context of stft" which is in the directory that can access the private function.

If you were hoping to call computeDFT in your code that is not possible unless it is in the toolbox directory, and I strongly recommend against you putting your own code in the toolbox directory (or indeed any directory under matlabroot.) This private function is not intended to be called by users directly.

[Yuantong Li]

Thank you very much! Right klick on "computeDFT" --> "open "computeDFT"" --> I got the script!