| zonal means, selective TOTAL(), etc. [message #11246] |
Wed, 18 March 1998 00:00 |
Craig Markwardt
Messages: 1869
Registered: November 1996
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Senior Member |
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I have also had the need for totalling over selective dimensions
(sometimes more than one dimension), and also MIN/MAX.
Check out my IDL web page for CMAPPLY(), which can apply quite a
number of operations to selected dimensions of an array. You can do
this to more than one dimension at a time using a *list* of dimensions
(similar to the DIMENSIONS parameter to MAKE_ARRAY or to REFORM).
http://astrog.physics.wisc.edu/~craigm/idl/idl.html
CMAPPLY supports more than just addition; it does:
'+' addition '*' multiplication
'AND' logical AND 'OR' logical OR
'MAX' maximum 'MIN' minimum
Where possible I avoid loops to improve performance, but your mileage
may vary depending on the detailed use. [ For example, for small
arrays, your own loop may be faster ].
Craig
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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@astrog.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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