Error while using cellfun with a function

I am using cellfun to apply a function on train and test variables for feature extraction. The function works absolutely fine when used without cellfun but with cellfun it gives an error. The code which I'm running:

RRTrain1 = cellfun(@(x)[rrvec] == RRfeatures(x),XTrain,'UniformOutput',false);

And this is the error which is appearing,

Unrecognized function or variable 'rrvec'.

Error in @(x)[rrvec]==RRfeatures(x)

However, rrvec is already declared within RRfeatures function. Can anyone please suggest how to solve this issue?

Answer 1

[Star Strider]

Try this instead —

RRTrain1 = cellfun(@(x)RRfeatures(x),XTrain,'UniformOutput',false);

I have no idea if that will do what you want.

More importantly, if the function works fine on its own, is there a specific reason for using cellfun?

[Arkaniva Sarkar]

The RRfeatures function generates a 1xn array as output whose value I'm pulling inside rrvec. That's why I'm using rrvec here.

I'm using cellfun as I'm working with around 5000 signals stored in a cell array and I think cellfun will help me apply the function to each signal inside the cell array.

[Star Strider]

First, you did not say if the change I proposed did what you wanted.

Second,.using a loop with the original function would likely be easier and more efficient, since you already know that the function would work in that context.

[Arkaniva Sarkar]

I solved the issue. It did not work that way. I had to use a counter instead of a loop. That served my purpose. Thank you for your help.

[Star Strider]

As always, my pleasure!