Trying to use for loop for 2D cell array of {1X4}(1X11}

for tr=2:ntr

Deman_EMG{tr}=cellfun(@minus,RawEMG{1,4}{tr},cellfun(@mean,RawEMG{1,4}{tr}));

end

Errorr: Error using cellfun

Input #3 expected to be a cell array, was double instead.

Answer 1

[Walter Roberson]

cellfun() requires a function handle for the first parameter (with some obscure exceptions.)

cellfun() requires a cell array for its second parameter.

cellfun() can have trailing name, value pairs, such as 'UniformOutput', 0

Between the second parameter and the start of name/value pairs, there can be any number of additional cell arrays.

cellfun(@minus,RawEMG{1,4}{tr},cellfun(@mean,RawEMG{1,4}{tr}))

The parameters of a function are evaluated before the function is called. It is not immediately obvious what the datatype of RawEMG{1,4}{tr} is, but for the moment we can examine the call under the hypothesis that RawEMG{1,4}{tr} is a cell array.

The third parameter, cellfun(@mean,RawEMG{1,4}{tr}) must be evaluated in order to determine what value to pass as the third parameter to the outputer cellfun() call.

Again we do not know what datatype RawEMG{1,4}{tr} is but a second again we supposed it might be a cellfun, so let us continue with that idea. So suppose cellfun(@mean) is being called on a cell array. mean() applies to numeric values and returns a numeric value, and 'uniformoutput' was not specified, so that inner cellfun() is going to return a numeric array.

So now we have the outer cellfun() call with the parameters being a function handle, a (hypothetical) cell array... and a numeric array. But that is not permitted: all arrays passed must be cell arrays.

My guess is that what you want is

cellfun(@(C) C - mean(C), RawEMG{1,4}{tr}, 'uniform', 0)

[Kiran Isapure]

Thanks for detailed explaination.

Yes, its a cell array of {1X4}{1X11} size.

Its still showing error as Error using cellfun Input #2 expected to be a cell array, was double instead.

[Walter Roberson]

I suspect:

for tr=2:ntr
    REt = RawEMG{1,4}{tr};
    Deman_EMG{tr} = Ret - mean(REt);
end 

or, no loop and

Deman_EMG = cellfun(@(C) C - mean(C), RawEMG{1,4}, 'uniform', 0);

except that this also takes the mean for RawEmg{1,4}{1}

[Kiran Isapure]

Thanks that worked but it only iteration for one cell, its not iterating for remaing 10 array cell.

ntr =11;

[Walter Roberson]

We are going to need example data with the exact same structure as your existing data to test with, as it sounds as if your actual data does not match the structure of data you described.

[Kiran Isapure]

I have a nested cell array pos{1X4} >> {6830X1}{6824X1}{6834X1}{6826X1}{6842X1}{6840X1}{6836X1}{6844X1}{6837X1}{6833X1}.

Thanks