| Updates to Markwardt Library [message #78838] |
Wed, 21 December 2011 18:38  |
Craig Markwardt
Messages: 1869
Registered: November 1996
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Senior Member |
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Hi Folks--
These days I don't promote my IDL library of software on the news
group much any more, but seeing David put out some update notices got
me motivated. I added a bunch of new routines that people might find
interesting. For newer readers who don't know me very well, I
specialize in the numerical and astronomical, but also in getting IDL
to do interesting tricks. Here are some of the new ones:
FLORMAT - Format a string with named format variables. This is an
interesting twist that brings Python-like format strings to IDL
(Python calls it "variable interpolation"). The key is that you can
use named variables to make your format strings more readable instead
of the impenetrable gobbledygook of normal IDL format strings. [*]
http://www.physics.wisc.edu/~craigm/idl/io.html#FLORMAT
GAPNAN - Insert NANs in time series gaps to facilitate plotting. It
handles the case where you want to plot a time series with gaps, but
don't want to connect the dots across gaps.
http://www.physics.wisc.edu/~craigm/idl/arrays.html#GAPNAN
PXPERFECT - Get 'pixel perfect' Postscript output which matches the on-
screen version. I figured out all the pixel scaling and font sizing
factors so that you don't have to. If you use this routine, your
Postscript output (processed by Ghostscript) should match almost pixel-
for-pixel with the on-screen direct graphics version. (fingers
crossed!)
http://www.physics.wisc.edu/~craigm/idl/graphics.html#PXPERF ECT
MPPROPERR - based on a user request, this routine provides a way to
estimate the uncertainty in your model function values due to
parameter uncertainties. Basically it answers the question of how
sensitive your model is to parameter variations. (you will need to
upgrade MPFIT to version 1.79 too)
http://www.physics.wisc.edu/~craigm/idl/fitting.html#MPFIT
TZOFFSET - Compute timezone offset from GMT for any date. If you've
ever wanted to convert between local and UTC time values, this routine
should help.
http://www.physics.wisc.edu/~craigm/idl/ephem.html#TZOFFSET
FILE_COMPILE - compiles an arbitrary procedure or function stored on
disk. It deals with all the difficulties of using RESOLVE_ROUTINE,
resetting your path, and catching errors, so you don't have to.
http://www.physics.wisc.edu/~craigm/idl/introspect.html#FILE _COMPILE
There are some other more minor changes. For more information, you
can see here
http://www.physics.wisc.edu/~craigm/idl/news.html
Best wishes for the holiday season!
Craig Markwardt
[*] - It's hard to explain. You can click through to the
documentation to read more about FLORMAT.
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