| Re: How to restrict region for !p.multi? [message #971] |
Wed, 21 April 1993 07:10 |
Jackel
Messages: 30
Registered: April 1993
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In article <20APR199309583254@stars.gsfc.nasa.gov>
fireman@stars.gsfc.nasa.gov (Gwyn F. Fireman) writes:
> From: fireman@stars.gsfc.nasa.gov (Gwyn F. Fireman)
> Subject: How to restrict region for !p.multi?
> Date: Tue, 20 Apr 1993 13:58:00 GMT
> Hello, IDL users -
>
> I'm using !p.multi to make a grid of 1-d plots under VMS IDL 2.4.0. In
> order to have the plots stack perfectly, I set !x.margin and !y.margin to 0.
> Unfortunately, this leaves no margin around the grid for annotation.
>
> I tried setting !p.region, but this seems to override the !p.multi
> settings. How do I restrict the output of !p.multi to a certain region?
> __.
> / | , , , , , ,_ Gwyn F. Fireman
> (__/|/(_(_)(_/|/| |_/ Computer Sciences Corporation
> /| /| IUEGTC::FIREMAN IUE Observatory
> (_/ (_/ fireman@iuegtc.dnet.nasa.gov (301) 794-1560
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Although I don't know of any elegant way of solving this problem, there
is an interesting way to do it by using negative values for the margins.
Here's an example using 3 sets of data plotted in a vertical stack:
x= randomn(seed,50,3) ;dummy data
null= replicate(' ',30) ;empty labels
ymargin0= [0,2] ;vertical margins for each
ymargin1= [2,0] ;plot. Note that ymargins
ymargin2= [4,-2] ;are [lower,upper]
!p.multi= [0,1,3]
plot,x(*,0),YMARGIN=ymargin0,XTICKNAME=null
plot,x(*,1),YMARGIN=ymargin1,XTICKNAME=null
plot,x(*,2),YMARGIN=ymargin2
The basic ideas are that:
-the total value of the upper and lower margins must be the same for each plot
-the total of the current upper margin and the previous lower margin must be
zero, in order to keep the plots adjacent. However, you will probably need
a non-zero upper margin to start with, and a non-zero lower margin to end with.
Also, it is usually necessary to mess with YTICKV and YTICKNAME, so that
the highest y-label on the current plot isn't in the same place as the
lowest y-label on the previous plot ie. if all the y-axes go from -4 to 4,
you would only want to label -3 to 3.
Anybody else have a better idea?
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