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matlabtype-conversionintegersigned

printing scalar as int32 in Matlab

I'm trying to print scalar as it would look like if it was int32. That is, if I have 2532063508, if I write it in 4 bytes and read as int32, I would read -1762903788.

using int32 function in Matlab didn't work, because the way it works is, values outside the range [-2^31,2^31-1] map to the nearest endpoint.

So I tried to use typecast: 

typecast(uint32(2532063508), 'int32')

works perfectly, but if I write e.g. -1 there, uint32() returns 0 so it fails.

P.S. I want it to work for signed integers as input as well, that is, for -1 it should return -1

any suggestions?

Solution

  • You can do calculations in int64 then convert to uint32:

    f = @(x)typecast(uint32(mod(int64(x),int64(2)^32)),'int32');

    Or

    function y = f(x)
    y = typecast(uint32(mod(int64(x),int64(2)^32)),'int32');
end

    So f([-1, 2532063508]) returns [-1, -1762903788].