| Re: contour & why pv-wave? [message #1362] |
Wed, 03 November 1993 08:46  |
paul
Messages: 22
Registered: June 1991
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Junior Member |
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In article <2b438m$94q@tali.hsc.colorado.edu>, mtadams@news.Colorado.EDU (Matthew T. Adams) writes:
> Hi all,
>
> I was wondering 2 things:
>
> 1) I've had to hack a bit around the contour procedure. Is there a contour
> *function* that will return to me an array of contour points or a structure that
> has contour headers and points (without my having to write the points to a file &
> then read the file (this was my hack))?
In IDL, use
contour, data, PATH_FILENAME=file_name, . . .
This writes the each contour path to the data file, and can be
read back in. The IDL Reference Guide for Version 3.1 describes this
on page 1-48. NOTE: The was tye data is written to the file
changed in release 3.1!!! so routines are not backward compatible.
It caused us more grief than it seems worth.
Also consider the /CLOSE parameter if you are trying to fill
contours. There is a bug in 3.1 which sometimes puts the wrong
value into the HIGH value of the contour_header. (3.5beta works
much better).
Once the data file is created, it can be read in with
openr, iu , file_name , /GET_LUN
hdr = {contour_header, type:0B, high:0B, level:0, num:0, value:0.0 }
release = FLOAT(!Version.release)
while not EOF(iu) begin
readu, iu, hdr
if ( release ge 3.1 ) then begin
x = fltarr( hdr.num )
y = fltarr( hdr.num )
readu, iu, x,y
endif else begin
d = fltarr( 2, hdr.num)
readu, iu, d
x = reform( d(0,*) )
y = reform( d(1,*) )
endelse
; The x and y values are in normalized coordinates
end
>
> 2) Is PV Wave a subset of IDL functions, or is it its own product? What does it
> have to do with IDL? Does it share the syntax or something?
>
> thanks,
>
> matthew
>
> ____________________
> mtadams@columbine.hsc.colorado.edu
> Matthew T. Adams
> University of Colorado Health Sciences Center
> Denver, CO
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