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//POW2DB Power to dB conversion
//YDB = POW2DB(Y) convert the data Y into its corresponding dB value YDB
//Example:
//Calculate ratio of 2000W to 2W in decibels
//y1 = pow2db(2000/2) //Answer in db
//Author : Debdeep Dey
function [ydb]=pow2db(y)
rhs = argn(2)
if(rhs~=1)
error("Wrong number of input arguments.")
end
[r,c]=size(y);
if (find(real(y(:))<0))==[] then
if abs(y(:))>=0 then
for i=1:r
for j=1:c
if abs(y(i,j))>0 then
ydb(i,j)=10*log10(y(i,j));
else
ydb(i,j)=-%inf;
end
end
end
end
else
error("The power value must be non-negative")
end
endfunction
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