| Re: Alternate plot scales [message #13881] |
Thu, 07 January 1999 00:00 |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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Brad Gom (gombg@uleth.ca) writes:
> On second thought, heres the plot. Does anyone have any idea
> how to reproduce it in IDL?
>
> [image/jpeg]
Can you supply a *link* to this image. My newsreader downloaded
*something*, but then threw it away and left me with what you
see above. :-(
Thanks,
David
--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Progamming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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| Re: Alternate plot scales [message #13882 is a reply to message #13881] |
Thu, 07 January 1999 00:00  |
Brad Gom
Messages: 49
Registered: August 1997
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Member |
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David Fanning wrote:
> I don't see any problem. The AXIS command will accept the normal
> XTICKS, XTICKV, etc. keywords. You can make the axis as elaborate
> and as tightly spaced as you like. Just remember to set the SAVE
> keyword on the call so subsequent OPLOTS will use the new axis.
>
Its funny that someone posted an almost identical question below. I think
Sebastien is wanting to do the same thing I am. Your suggested program,
however, is not what I need; in the plot, the axis ticks are regularly spaced
and there are two plot lines. What I need is one plot line, but with two
different scales that you can read values off.
For example, you can plot the Planck Blackbody curve as a function of
wavelength, wavenumber, or frequency. Ideally, I want to plot one line, and
have three axis that I can read the values off in the proper units.
(wavenumber is reciprocal wavelength, and frequency is c divided by the
wavelength). The three axis will necessarily have different spacings- ie one
may be linear and another logarithmic.
I can include a scan of a plot that I want to duplicate if I haven't
explained myself well enough.
thanks
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| Re: Alternate plot scales [message #13887 is a reply to message #13881] |
Wed, 06 January 1999 00:00 |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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Brad Gom (gombg@uleth.ca) writes:
> I'm looking for a way to draw a secondary plot scale. The problem is
> that I want the second axis scale to be a function of the first.
>
> For example, the lower x-axis is a standard linear scale, and the upper
> x-axis is the square of the lower axis. Now the tricky part: I want the
> tickmarks for the second axis to occur at regular -numeric- (not
> graphical) intervals.
>
> eg. if the lower scale had ticks at [4,5,6,7,8], then it would be
> trivial to have the upper axis with the corresponding ticks labeled
> [16,25,36,49,64]. What I want is for the ticks on the upper axis to
> occur at some interval like [20,25,30,35,40,45,50,55,60] so that their
> spacing on the plot gets tighter but the numeric interval is constant.
I don't see any problem. The AXIS command will accept the normal
XTICKS, XTICKV, etc. keywords. You can make the axis as elaborate
and as tightly spaced as you like. Just remember to set the SAVE
keyword on the call so subsequent OPLOTS will use the new axis.
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Progamming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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