| contour...pathfile problem in WAVE [message #9651] |
Fri, 01 August 1997 00:00 |
Fred Wolf
Messages: 1
Registered: August 1997
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Junior Member |
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hi,
I have a problem with the contour routine in pv-wave.
I would like to directly access the contour-paths that
the contour program calculates.
E.G. The comand
contour,x,levels=[0],PATH_FILENAME="cont", /FOLLOW
is suposed to write the 0-contours of x in the file
"cont". Any indiviudal contour-data-set starts with
a header of the structure
h = {CONTOUR_HEADER, TYPE : 0B, HIGH : 0B, LEVEL : 0, $
NUM : 0L, VALUE : 0.0}
followed by NUM floating coordinate pairs.
When I try to read the file cont, I get junk.
The main problem is that h.num appears to contain a
fantasie number instead of the number of contour points.
A minor problem is that any closed contour-path begins
with the coordinates (0,0).
The following sequence of comands ilustrates the problem:
x = shift(dist(20),10,10)^2-16
contour,x,levels=[0],PATH_FILENAME="cont", /FOLLOW, /noerase
h = {CONTOUR_HEADER, TYPE : 0B, HIGH : 0B, LEVEL : 0, $
NUM : 0L, VALUE : 0.0}
y = fltarr(2,34)
openr,1,"cont"
readu,1,h
readu,1,y
close,1
print,h
plot,y(0,*),y(1,*)
print,h gives "{ 1 0 0141733920768 0.00000}"
while the contour-path however actualy contains only 34 but not
141733920768 entries.
Is this a bug? Does anybody know how to reveal the true number of
contour-path entries?
Thanks a lot in advance
Fred
************************************************************ ************
Fred Wolf E-Mail: fred@chaos.uni-frankfurt.de
Max-Planck-Institut
f. Stromungsforschung
Bunsenstr. 10 Tel: 0551/5176-423
D-37073 Gottingen Fax: (49)551/5176-402
Germany
************************************************************ ************
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