Re: axes labels on errorbar plots

[taltman]

Hi Przemek,

I've been thinking about the same think recently. As much as people
would like to deny it, more and more benefits can be won from using
symbolic programming approaches for numerical applications (
otherwise, this would be a Fortran list ;-) ). I'd like to write a
suite of programs that could trade-off speed for additional
calculation, such as:

* numerical error propagation.

* measurement error propagation.

Also, my dream-package would also allow for arbitrary precision
calculations.

~Tomer



On Nov 21, 2003 at 12:30pm, Przemek Klosowski wrote:

przeme >Date: Fri, 21 Nov 2003 12:30:14 -0500 (EST)
przeme >From: Przemek Klosowski <address@hidden>
przeme >To: address@hidden, address@hidden
przeme >Subject: Re: axes labels on errorbar plots
przeme >Resent-Date: Fri, 21 Nov 2003 11:30:15 -0600
przeme >Resent-From: address@hidden
przeme >
przeme >
przeme >Re. errorbar plots, here's my pet peeve. I would like there to be
przeme >an octave-like system whose basic data type is 'data with errors', and
przeme >all operations calculate proper error estimates. This requires
przeme >changing the basic ops, which is not that hard, but it also requires
przeme >rewriting all the algorithms, because e.g. the error estimate of a
przeme >matrix inversion, as determined by propagating errors via individual
przeme >operations like multiply/add, is, I think, very overly pessimistic. A
przeme >realistic, smaller estimate is obtained by looking at the algorithm as
przeme >a whole.
przeme >
przeme >NB, errorbar plots can always use gplot directly
przeme >
przeme >    tmp=[(1:10)',sqrt(1:10)',sqrt(sqrt(1:10))'];
przeme >    gplot tmp with errorbars
przeme >
przeme >
przeme >
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przeme >
przeme >



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Octave is freely available under the terms of the GNU GPL.

Octave's home on the web:  http://www.octave.org
How to fund new projects:  http://www.octave.org/funding.html
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