segmentation of a signal

i have a nx3 matrix of a signal and i want to make small segments of 0.3 ms of this signal. using the following code i can make those segments but i am unable to store all the segments like frame1,frame2...last frame. i dont understand what am i missing in this code. and lastly i get the error"Warning: Integer operands are required for colon operator when used as index" when i use this code. the matrix name is prblm and it is 81920x3

fs=2048;
frame_duration=0.3;
frame_samples_length=(frame_duration*fs);
n= length(prblm);
number_of_frames=floor(n/frame_samples_length);
for k = 1:number_of_frames
    frame = prblm((k-1)*frame_samples_length+1:frame_samples_length*k,:);
end

[Priyanka Shanmuga Raja]

frame = prblm((k-1)*frame_samples_length+1:frame_samples_length*k,:);

I guess, here you are trying to index from 1 to a decimal. May be try using floor()

Answer 1

[Ameer Hamza]

In your code, 'frame_samples_length' can be a floating-point number. Also, 81920 is not evenly divided by frame_samples_length. You are also not saving the output of loop operations.

Try mat2cell()

prblm = rand(81920, 3); % for example

fs=2048;
frame_duration=0.3;
frame_samples_length = floor(frame_duration*fs);
n = size(prblm, 1);
number_of_frames=floor(n/frame_samples_length);
frame_lengths = [frame_samples_length*ones(1, number_of_frames) n-number_of_frames*frame_samples_length];

parts = mat2cell(prblm, frame_lengths, 3)

'parts' is a cell array. Access it using brace indexing

parts{1} % first portion
parts{2} % second portion
..
..
parts{end} % last portion

Answer 2

[KSSV]

fs=2048;
frame_duration=0.3;
frame_samples_length=(frame_duration*fs);
n= length(prblm);
number_of_frames=floor(n/frame_samples_length);
frame = zeros(number_of_frames,3) ; 
for k = 1:number_of_frames
    frame(k,:) = prblm((k-1)*frame_samples_length+1:frame_samples_length*k,:);
end

Answer 3

[Rida Alfonso]

clc

clear

fs=2048;

windowSize = fs*0.3; % Number of samples required for 200ms window

stepSize = fs*0.05; % Number of samples required for 50ms overlap

Nwind = floor((size(prblm,1) - windowSize) / stepSize + 1);

for i = 1:Nwind

startsample = 1+(i-1)*stepSize; % Start sample of window

endsample = (i-1)*stepSize + windowSize; %End sample of window

iterations = prblm(startsample:endsample, :) % but i get errors in this one

%store values of each iterations

end

Thank you very much for all your replies, i really appreciate your help. The earlier part was disjoint segmentation and you people solved that, but my actual problem is to perform overlapping segmentation , like the next window should start from 0.05 seconds overlap of 1st window and then go on... i was able to create a loop for this but i am again stuck in saving the iterations as i would need them in the later step of feature extraction.