log2(0)=-inf problem

2011 10 5

1 个回答

4 次查看（30 天）

1 个投票

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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Sean de Wolski 2011-10-5

1 个投票

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.

Matt Tearle 2011-10-5

y(isinf(y)&~isinf(x)) = 0

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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