round numeric 0

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Pinco
Pinco on 17 Jan 2012
Hi everyone! I have a matrix like this:
A=[ 1 , .3*10^-8 , .2*10^-8 , .2*10^-8;
. 3*10^-8; 1; .2*10^-8;
.2*10^-8, .2*10^-8, 1];
I want 0 (real or integer) where i have a very very very small value. How can I do it?
I know I can use logical mask
A(A<10^-7=0)
but i'm looking for a matlab function that can do automatically. This is a typical numeric problem...
Thanks a lot for you answer.
Pippo

Accepted Answer

Andreas Goser
Andreas Goser on 17 Jan 2012
This is actually done automatically if it is very very very small. But it looks the veryveryvery is different for you. The
eps
Function return what MATLAB sees as small enough to be rounded to zero.
Besides your own suggestion (probably think also of negative small values, you may use all kinds of rounding and formatting like
round
sprintf
depending on your needs.

More Answers (1)

Jaap
Jaap on 17 Jan 2012
your best option:
A(A<small_value) = 0
you can also try:
A = A(bsxfun(@lt,A,1E-7))
I doubt its quicker.
  1 Comment
Jaap
Jaap on 17 Jan 2012
you get the point

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