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plot position keyword [message #89402]

Tue, 07 October 2014 12:46

Mark Quigley
Messages: 8
Registered: August 2009

Junior Member

I haven't found this in the documentation so I thought I'd post it here, my apologies is this is old news.

I have a routine that creates an array of position vectors, something like what is done with !p.multi=[0,2,2], with a few bells and whistles which don't matter here. For example:

pos = sub_multipos(2,3)
plot,findgen(10),pos = pos[*,NN] ;where NN is 0 to 5.

What I want to do to use the pos array if it exists, or the position defined by !p.multi if is doesn't.

It turns out that this works:

!p.multi=[0,2,2] at some point earlier....

pro something, arr,pos

;pos not defined
pos = n_elements(pos) eq 0 ? [!null,!null,!null,!null] : pos
plot,arr,pos=pos

arr is plotted where it should be according to !p.multi.

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