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Plotting vectors [message #12249]

Fri, 24 July 1998 00:00

Vap User
Messages: 31
Registered: April 1998

Member

Hi;

I posted something on this subject yesterday, but it seems the
article got waylaid, so I'm reposting. If you see two messages on
vector plotting in IDL, forgive the duplication.

I have a request for a new functionality in IDL. I would like to see
something like the following.

Use usersym to define a symbol, in my case, an arrow. Then plot it
using

plots, x,y, psym=8, orientation=orientation

where orientation is an array having the same dimensionality as X/Y
and gives the orientation in degrees (or maybe radians?) away from
some axis, most likely the X axis.

At the moment I'm forced to loop through the vectors, and all good IDL
programmers abhor loops, constructing the actual symbol by a
complicated call to plots. Back in the days when I only had to plot
24000 vectors for each swath of data this was tiresome but not
terminal, but now I'm working on a project where each swath contains
124K vectors, with 14 swaths per day, each one taking ~30 seconds to
plot using a customized version of velovect.pro. 7 mins to wait to see
a days data.

Waddya think?

--
I don't speak for JPL, it doesn't speak for me.
Well, not all the time, at least.
William Daffer <vapuser@haifung.jpl.nasa.gov>

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[Message index]

		Plotting vectors By: Vap User on Fri, 24 July 1998 00:00
		Re: Plotting vectors By: Chris[2] on Thu, 05 October 2006 19:57
		Re: Plotting vectors By: Andy Heaps on Thu, 05 October 2006 02:56

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