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This code finds log10 of the values of some vector (x). The line:
y = -Inf*ones(size(x));
is meaningless in this part of the code because it is overridden later by:
y(nonzero) = 10*log10(abs(x(nonzero)));
There could be more lines in this function that need the variable (nonzero). A much simpler code is:
function y=dbp(x) y = 10*log10(abs(x(:)))';
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