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Re: Top 10 IDL Requests [message #20651 is a reply to message #20650] Mon, 17 July 2000 00:00 Go to previous messageGo to previous message
landsman is currently offline  landsman
Messages: 93
Registered: August 1991
Member
Here are my wishes for math updates in IDL:

1. My longtime wish is to update the "Numerical Recipes" which call a
user-specified function (e.g. QROMB, LMFIT) and currently require the
user function to accept a scalar argument and return a scalar value.
This goes against the spirit of IDL and makes the routines unacceptably
slow for most real-life applications. (I wonder if it is a problem
with the licensing agreement with Numerical Recipes that prevents
modifying the routines to make them more IDL compatible.)


2. Median filtering is a non-linear operation which cannot be easily
vectorized, so I would like to see more capabilities in the MEDIAN
function:

1. Allow separate specification of the X and Y filter size (e.g. im1 =
median(im,[15,3]), which would be useful, for example, in removing bad
columns. 2. For 2 or 3 dimenional images, allow MEDIAN to work over a
specified dimension, e.g. for removing cosmic rays from a stack of images in
a 3 dimensional array. (This capability would also be useful in MIN and
MAX.) 3. Allow the user to specify a "kernel" (as with CONVOL) specifying
weights to be assigned to pixels within the filter size. One such
application of a such a generalized median is described at
http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1995 PASP..107..496S&d
b_key=AST&high=38aaedbba709215

--Wayne Landsman landsman@mpb.gsfc.nasa.gov


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