| Plotting a long vector on PV-WAVE [message #10468] |
Mon, 01 December 1997 00:00 |
Christos Siopis
Messages: 1
Registered: December 1997
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Junior Member |
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Greetings,
I have a long real-number vector (of more than 10,000 elements) that
I would like to plot (e.g., versus time). However, if I plot the
whole thing the display gets crammed... The best way I can think of
to view the data is to see it as a time series: plot only a few data
points at a time and "pan" (scroll) the viewing window to the right.
I tried to do something like that, using the Z buffer to avoid the
flickering, but the program runs very slow (it takes about 1/3 or 1/2
of a second between consecutive frames on a Pentium/Linux machine).
Is this normal? Here is the procedure I used (PV-WAVE):
PRO pan, x, n, win, stp
; x = fltarr(n)
; n = number of datapoints (e.g., 10000)
; win = viewing window size (e.g., 100 data points at a time)
; stp = how much to shift to the right between successive
; snapshots (e.g., 10)
thisdev = !D.Name
for i = 0, n-win-1 do begin
set_plot, 'z'
plot, x(i:i+win), psym=-2
snap = tvrd(0,0,640,512)
set_plot, thisdev
tv, snap
if (get_kbrd(0) ne "") then return
endfor
END
What's also funny is that the "TV, snap" command worked
instantaneously on a low-end Sun workstation but it would need half a
second or more to "unroll" on a much faster DEC Alpha machine. Could
it be that the Alpha's display holds more information?
Thank you,
Christos
--
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/ Christos Siopis | Voice : (352) 374-6833 (home) \
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