| correct way to use INTERPOLATE function [message #55983] |
Fri, 21 September 2007 11:00 |
rchughes
Messages: 26
Registered: April 2006
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Junior Member |
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Hi All,
I want to plot two arrays of different sizes so I am trying to use
INTERPOLATE on the smaller array to make it the same size as the large
one. I can't seem to use the INTERPOLATE function correctly and there
isn't very much documentation on how to generalize it's use. I need
help in generalizing its use. All I get as a result is the first
element repeated (the same result I would get if I used the REPLICATE
function). I want to do this in the general case because I need to do
it a few times. Here is a simpler version of what I am doing:
smallarray = [10.3, 9.6, 9.2, 8.5, 7.7, 6.9, 5.8, 5.4, 4.7, 4.1]
largearray = FINDGEN(1000)*0.5
smsize = N_ELEMENTS(smallarray)
lasize = N_ELEMENTS(largearray)
interpped = INTERPOLATE(smallarray, smsize/(lasize-1)*FINDGEN(lasize))
PLOT, interpped, largearray
One feature of the small array is that it is decreasing throughout and
has approximately 100 elements. The large array has several thousand
elements. I believe there is an error in the equation I have in the
second argument.
Thanks,
Ryan.
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