MATLAB: Speeding up comparison using strcmp

reducing the code execution timestring comparison

Hello! I have a list of approximately 2 million records and I would like to compare the records with a list of devices which generates those records. My code is as follows where "c" is the list of records and "device" is the list for distinct devices:
for ii = 1:length(device)
idx = ( strcmp(c,device(ii,:)) );
lidx = find(idx);
devid{ii} = lidx;
end
The problem is the above code takes too long time (more than an hour). Would you please tell me know how to reduce execution time?
Many thanks!

Best Answer

Hi,
I would convert device to a cell array (using cellstr) and then call ismember without the loop, something like
cellDevice = cellstr(device);
[~, devid] = ismember(cellDevice, records);
Titus