add missing matlab functions

function [floatv, integer, Q] = toInt16(float)

maxV = max(max(abs(float)));

Q = 15;

for i = 15:-1:0

    if maxV * 2^i <= 2^15

        Q=i;

        break

    end

end

integer = floor(float * 2^Q);

floatv = integer * 2^-Q;

end

function [floatv, integer, Q] = toInt32(float)

maxV = max(max(abs(float)));

Q = 31;

for i = 31:-1:0

    if maxV * 2^i <= 2^31

        Q=i;

        break

    end

end

integer = floor(float * 2^Q);

floatv = integer * 2^-Q;

end