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2 cent tip: Faster way to plot millions of points [message #9497]

Fri, 11 July 1997 00:00

Liam Gumley
Messages: 473
Registered: November 1994

Senior Member

Sometimes we need to plot spectra which contain millions of points. It
appears to be faster to use PLOTS (rather then PLOT).

Try the following:

n = 1000000L
x = lindgen(n)
y = sin(2.0*!pi*findgen(n)/(n-1))
t0 = systime(1.0) & plot,x,y & print,systime(1.0)-t0
t0 = systime(1.0) & plot,x,y,/nodata & plots,x,y & print,systime(1.0)-t0

On my SGI Power Indigo running IDL 5.0, it takes 21.43 sec for the first
plot, and 12.46 sec for the second plot. I observe similar speedups on
Linux (IDL 5.0) and Windows NT 3.51 (IDL 4.0.1).

Cheers,
Liam.

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2 cent tip: Faster way to plot millions of points

By: Liam Gumley on Fri, 11 July 1997 00:00

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