how to find number of bytes in a row of a matrix

I have a matrix with 4431 rows and 102 columns. Each column is of different length(1st column is 4 bytes and precision is unsigned integer32, 2nd column is 2 bytes and precision is unsigned inter 16 etc) Total bytes in a row is 5822. how to read from a specific byte in a row?

Answer 1

[Azzi Abdelmalek]

Look at this example

a=num2cell(uint16(randi(4,1,4)))
b=num2cell(uint32(randi(4,1,4)))
c=[a b]
d=c(randperm(8))

% d is a cell array containing uint32 and uint16 numbers

idx=cellfun(@(x) isequal(class(x),'uint32'),d) % Find indices of uint32 numbers
out=d(idx)