MATLAB: Converting “twos complement” – decimal to actual twos complement and back to decimal

binaryconverttwo's complement

Hello there
I've been working on a god damn binary-decimal conversion for at least three hours now so please help me out.
I imported a very large .csv file where the columns represent 32bit twos complement but are actual decimal values. So the very first element for example is 4.294.721.774 instead of an awful lot of ones and zeros.
In order to convert this number to the actual real value I tried the following:
% q object for 32bit precision
q = quantizier([32 31]);
% test with first element
num = 4294721774;
bin = de2bi(num, 'left-msb');
% convert binary array to string
str_bin = mat2str(bin);
% cut lead, tail and spaces
str_bin = str_bin(2:end-1);
str_bin = strrep(str_bin, ' ', '');
% convert back
output = bin2num(q, str_bin);
But not only is this highly inefficient, it also doesn't work… Any suggestions?

Best Answer

Ah. Try:
 typecast(uint32(4294721774),'int32')
I'm sure someone mentioned a faster version was in file exchange somewhere.
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