How do i select the datafile with the smallest lenght?

I've got a 5x5 matrix (data_stair_rise), and each cell is a struct. Each struct contains a datafile called 'VideoSignals'. I need to select the datafile which has the smallest length. How do I do this?

When I open 'data_stair_rise' it looks like this: data_stair_rise(1, 1). Now there is an overview of datafiles and 'VideoSignals' is one of them.

Answer 1

[Image Analyst]

Why not just use dir() to select the file with the fewest number of bytes in it?

fileInfo = dir(filename);
bytesInFile = fileInfo.bytes;

[Sam]

fileInfo = dir(data_sts)

Error using dir Function is not defined for 'struct' inputs.

[Image Analyst]

I said to pass it a filename , not a structure, like dir('yourMatFile.mat') or whatever.

Answer 2

[Guillaume]

Your question is a bit confusing because you're not using the proper terminology. A structure does not contain datafile. A structure is made of fields.

Length can also have several meaning. Matlab's own length function returns the size of the largest dimension (and thus is best avoided). I'll assume here you want the matrix / vector with least number of elements, so I'll use numel instead.

One way to do what you want:

data1d = data_stair_rise(:); %reshape data_stair_rise as a 1D array to make the rest easier
signallengths = arrayfun(@(elem) numel(elem.VideoSignals), data1d);
[~, idx] = min(signallengths);
smallestsignal = data1d(idx).VideoSignals;