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Re: Over-plotting problem... [message #9423 is a reply to message #9309]

Fri, 27 June 1997 00:00

Jim O'connor
Messages: 7
Registered: March 1996

Junior Member

Gregory Grason <grason@jhuapl.edu> writes:

> Specifically what is a user symbol and why would I need one to
> over-plot? I've never encountered this error before:
>
> % OPLOT: No user symbol defined.
>

A user symbol (basically a user-supplied polygon) is useful if you
want to use a period as a plotting symbol, but want to make the period
larger than a vanishingly small dot. You might figure SYMSIZE would
work with PSYM=3, the built-in period symbol, but it doesn't. Thus:

Wave> x = findgen(100)/99.*2*!Pi*3
Wave> plot,x,sin(x),psym=3,symsize=4

does not make large dots. However, if you define a user symbol like
this:

Wave> r0=1.0 & inc=16
Wave> a=FINDGEN(inc) * (!PI * 2 /inc)
Wave> a = [a,a(0)] ;close the symbol
Wave> USERSYM, r0*cos(a),r0*sin(a),/fill ;creates a filled symbol

you can now get big dots with this:
Wave> plot,x,sin(x),psym=8,symsize=4

--
Jim

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[Message index]

		Over-plotting problem... By: Gregory Grason on Wed, 25 June 1997 00:00
		Re: Over-plotting problem... By: Jim O'connor on Fri, 27 June 1997 00:00

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