can someone explain to me what is this entire code means?
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ptotdB = dbp(ptot);
in another file:
function y=dbp(x)
y = -Inf*ones(size(x));
nonzero = x~=0;
y(nonzero) = 10*log10(abs(x(nonzero)));
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the cyclist
el 22 de Mzo. de 2013
Editada: the cyclist
el 22 de Mzo. de 2013
Looks like it's converting any non-zero input to decibels ( http://en.wikipedia.org/wiki/Decibel ), and zero input to negative infinity.
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Walter Roberson
el 24 de Mzo. de 2013
It depends what you mean by "declare". In order to use the function, you need to pass in an input value to the function, but the variable name you use in the calling function does not need to be named "x".
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Ahmed A. Selman
el 24 de Mzo. de 2013
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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