Description:
IDL and PV-Wave language discussions.
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SPLINE function
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Just wondering what type of spline the built in IDL SPLINE function
actually solves?
In the help it just says 'cubic spline interpolation', however there
are a lot of different types of spline that are based on a cubic
spline or reduce to a cubic spline depending on the parameters chosen.
I'd kind of assumed it was a standard cubic spline with natural... more »
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read a C written binary file with IDL
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Hi,
I am having a problem with reading a C written binary file with IDL.
It may come from differences of type definitions between C and IDL but
I could not really figure out from Google...
In C, it writes a structure containing the following variable types:
struct MyStruct
{
int a;
long long b;... more »
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Difficulty with N_ELEMENTS command
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Hi.
I'm trying to create an array of the number of elements that satisfy a
certain criterion as below.
FOR m=0,nyears-1 DO BEGIN
exceed_freq(m)=N_ELEMENTS(WHER E(precip_day(m,*) gt smoothed(*)))
ENDFOR
The problem I have is that for some years in my program there are no
elements that satisfy this criterion, however the value returned in... more »
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Counting Clicks in List Widgets
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Folks,
I ran into an interesting little, uh, feature
today. In the Coyote Library there is a small
dialog widget called a List_Selector. It just allows the user to specify items in a list and
select one or more of them, returning the selected
items to the user.
selectedItems = List_Selector(['cow', 'dog', 'coyote'])... more »
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finding cluster boundary
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Hi, Folks
I've got a collection of 2D points that have already been identified
as a cluster. Is there a quick way to extract the boundary points of
the cluster? I understand the easiest way is to use TRIANGULATE
procedure to get the boundary points in counterclockwise order.
However, the points returned are like a convex envelope of the cluster... more »
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!NULL in IDL 7.1 vs. 8.0
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Hey all,
I'm debugging some IDL code and I noticed some odd behavior with the
system variable !NULL in IDL 7.1, curious if others had seen this....I
suspect it's a bug and I can avoid it in IDL 8.
In IDL 7.1 if I do a
IDL>print,!NULL
I get % Not a legal system variable: !NULL.
In IDL 8 it properly returns !NULL. Have others observed this?... more »
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