Concatenating cell arrays with a different number of columns

I have a 64x1 cell array that looks like this, I would like to vertically concatenate the cells in this array, and pad the rows with less columns with zeros

Answer 1

[Guillaume]

maxcols = max(cellfun('size', NonC_tRNAs, 2));  %get the number of columns of the widest array
padded = cellfun(@(m) [m, zeros(size(m, 1), maxcols - size(m, 2))], NonC_tRNAs, 'UniformOutput', false);  %pad each array
NonC_tRNAs_Reference  = vertcat(padded{:})

[Sumara]

This results in an error in the first line:

error using cellfun

cellfun only works on cells

[madhan ravi]

Read the answer once again. The way Guillaume showed yourcellarray is the name of your cell array. Since you beautifully cropped the screenshot, hence thy name was shown for an example.

[Sumara]

Apologies, I just did a screengrab because inputting all of the manipulations to get to this output would be cumbersome.

I did in fact put my cell array in for yourcellarray

maxcols = max(cellfun('size',2,NonC_tRNAs))
padded = cellfun(@(m) [m, zeros(size(m,1),maxcols - size(m,2))], NonC_tRNAs, 'UniformOutput', false)
NonC_tRNAs_Reference = vertcat(padded{:})

[Guillaume]

I had the inputs to cellfun('size', ...) in the wrong order. Fixed now.

[Sumara]

The correction worked wonderfully! Thank you!!!!

[mmfjerstad]

Sorry if this is a dumb question, but what is "m" in this instance?

padded = cellfun(@(m) [m, zeros(size(m, 1), maxcols - size(m, 2))], NonC_tRNAs, 'UniformOutput', false); %pad each array

[Guillaume]

" what is "m" in this instance?"

An arbitrary name for the input variable of the anonymous function called by cellfun. It will be in turn each element of the same array.