Converting "twos complement" - decimal to actual twos complement and back to decimal
164 views (last 30 days)
Show older comments
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?
0 Comments
Accepted Answer
Iain
on 29 Aug 2014
Ah. Try:
typecast(uint32(4294721774),'int32')
I'm sure someone mentioned a faster version was in file exchange somewhere.
See Also
Categories
Find more on Data Type Conversion in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!