operations on single precision numbers unstable in matlab 7.1 (64bit ) vesions and higher
Jan Mathijs Schoffelen
Jan.Schoffelen at FCDONDERS.RU.NL
Tue Nov 28 14:12:28 CET 2006
Dear Ali,
What about temporarily converting your data into double precision, and doing
your stuff?
data = struct2double(data);
DO YOUR STUFF HERE
data = struct2single(data);
Yours,
JM
-----Original Message-----
From: FieldTrip discussion list [mailto:FIELDTRIP at NIC.SURFNET.NL] On Behalf
Of Ali Mazaheri
Sent: Tuesday, November 28, 2006 1:55 PM
To: FIELDTRIP at NIC.SURFNET.NL
Subject: [FIELDTRIP] operations on single precision numbers unstable in
matlab 7.1 (64bit ) vesions and higher
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=single(a);
b=single(b);
>> 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.
regards
Ali
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