operations on single precision numbers unstable in matlab 7.1 (64bit ) vesions and higher

Ali Mazaheri ali.mazaheri at FCDONDERS.RU.NL
Tue Nov 28 13:55:05 CET 2006

Dear all,
The long subject captions says it all.
I just recently discovered that solutions to the  low level functions in
matlab7.1 and  higher run on a 64 bit platform  become unstable when
using single precision.
This problem does not appear to be  present on matlabs running on a 32
bit platform.

A simple example of this problem is as follows

 a=[1 2]
b=[1 2];

 >> a/b
ans = 1

NOW in single precision

 >> a/b
ans = 1.9074 e-05

the problem of course become much more compounded when doing more higher
level functions such as detrend. I am completely unable to do a linear
detrend on
single precious data.


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