log2(0)=-inf problem

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Nikolaos
Nikolaos 2011-10-5
Hallo,
my problem is that i want to set the quantity log2(0), so as log2(0)==0 {normally it is log2(0)==-inf}. is there a simple way to do this?
Thanks you in advance.

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回答（1 个）

Sean de Wolski
Sean de Wolski 2011-10-5
Write your own log2 and call it:
function out = mylog2(in)
out = log2(in);
out(~in) = 0;
end
Add the F/E output options if desired.
It would be very dangerous to overload this function since it's probably used elsewhere.
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Matt Tearle
Matt Tearle 2011-10-5
y(isinf(y)&~isinf(x)) = 0
Sean de Wolski
Sean de Wolski 2011-10-5
I'm holding to ~x, logical and foolproof, no, doh! can't convert nan to logical arghh...
x==0

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