On 05/01/2012 10:54 PM, Russ P. wrote:
On May 1, 11:52 am, someone<newsbo...@gmail.com> wrote:
On 04/30/2012 03:35 AM, Nasser M. Abbasi wrote:
What's the limit in matlab (on the condition number of the matrices), by
the way, before it comes up with a warning ???
The threshold of acceptability really depends on the problem you are
trying to solve. I haven't solved linear equations for a long time,
but off hand, I would say that a condition number over 10 is
questionable.
Anyone knows the threshold for Matlab for warning when solving x=A\b ? I
tried "edit slash" but this seems to be internal so I cannot see what
criteria the warning is based upon...
A high condition number suggests that the selection of independent
variables for the linear function you are trying to fit is not quite
right. For a poorly conditioned matrix, your modeling function will be
very sensitive to measurement noise and other sources of error, if
applicable. If the condition number is 100, then any input on one
particular axis gets magnified 100 times more than other inputs.
Unless your inputs are very precise, that is probably not what you
want.
Or something like that.
Ok. So it's like a frequency-response-function, output divided by input...
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