| Axis issues, cgSurf and cgContour [message #90381] |
Fri, 27 February 2015 10:40  |
sam.tushaus
Messages: 14
Registered: February 2015
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Junior Member |
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Hello! I've been attempting to plot contour data and data on a surface using cgContour and cgSurf, respectively. In both cases I've had issues with the axes. The general form of each command is as follows:
cgContour, data, x, y
cgSurf, data, x, y
Unfortunately, actually inserting something for x and y above hasn't been working out for me. In cgContour, I get a jumbled mess of contours that only vaguely resembles the actual data; in cgSurf, I get only a thin cylinder in the middle of the plot. Plotting without using x and y creates the proper plots, but requires forcing my axes, which can be tedious to program when handling large quantities of data and large numbers of plots (which I need to automate).
Does anyone have experience with this issue? Any fixes? I've tried switching x and y, switching the dimensions of my x and y arrays, using vectors vs 2D arrays...but I've gotten nowhere so far.
Thanks for your help!
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| Re: Axis issues, cgSurf and cgContour [message #90382 is a reply to message #90381] |
Fri, 27 February 2015 10:48  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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sam.tushaus@gmail.com writes:
> Hello! I've been attempting to plot contour data and data on a surface using cgContour and cgSurf, respectively. In both cases I've had issues with the axes. The general form of each command is as follows:
> cgContour, data, x, y
> cgSurf, data, x, y
> Unfortunately, actually inserting something for x and y above hasn't been working out for me. In cgContour, I get a jumbled mess of contours that only vaguely resembles the actual data; in cgSurf, I get only a thin cylinder in the middle of the plot. Plotting without using x and y creates the proper plots, but requires forcing my axes, which can be tedious to program when handling large quantities of data and large numbers of plots (which I need to automate).
>
> Does anyone have experience with this issue? Any fixes? I've tried switching x and y, switching the dimensions of my x and y arrays, using vectors vs 2D arrays...but I've gotten nowhere so far.
I have no idea what "forcing my axes" means, but if the commands work
when you don't specify X and Y values, I presume this means when you do
provide them you are doing so incorrectly. But, I really can't tell from
the evidence you have presented.
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")
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| Re: Axis issues, cgSurf and cgContour [message #90384 is a reply to message #90381] |
Fri, 27 February 2015 11:00 |
wlandsman
Messages: 743
Registered: June 2000
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Senior Member |
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On Friday, February 27, 2015 at 1:41:01 PM UTC-5, sam.t...@gmail.com wrote:
> cgContour, data, x, y
> cgSurf, data, x, y
> Unfortunately, actually inserting something for x and y above hasn't been working out for me. In cgContour, I get a jumbled mess of contours that only vaguely resembles the actual data;
If your x,y values are not monotonic, it would screw up the appearance of the contour.
If your x,y values are monotonic try a couple of diagnostic tests:
1. Does cgContour work with a simple example?
IDL> cgcontour,dist(20),indgen(20)+50,indgen(20)-100
2. Try replacing cgContour with Contour and see if you still have the problem
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| Re: Axis issues, cgSurf and cgContour [message #90385 is a reply to message #90382] |
Fri, 27 February 2015 11:09 |
sam.tushaus
Messages: 14
Registered: February 2015
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Junior Member |
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On Friday, February 27, 2015 at 12:48:25 PM UTC-6, David Fanning wrote:
>
>
>> Hello! I've been attempting to plot contour data and data on a surface using cgContour and cgSurf, respectively. In both cases I've had issues with the axes. The general form of each command is as follows:
>> cgContour, data, x, y
>> cgSurf, data, x, y
>> Unfortunately, actually inserting something for x and y above hasn't been working out for me. In cgContour, I get a jumbled mess of contours that only vaguely resembles the actual data; in cgSurf, I get only a thin cylinder in the middle of the plot. Plotting without using x and y creates the proper plots, but requires forcing my axes, which can be tedious to program when handling large quantities of data and large numbers of plots (which I need to automate).
>>
>> Does anyone have experience with this issue? Any fixes? I've tried switching x and y, switching the dimensions of my x and y arrays, using vectors vs 2D arrays...but I've gotten nowhere so far.
>
> I have no idea what "forcing my axes" means, but if the commands work
> when you don't specify X and Y values, I presume this means when you do
> provide them you are doing so incorrectly. But, I really can't tell from
> the evidence you have presented.
>
> Cheers,
>
> David
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
> Sepore ma de ni thue. ("Perhaps thou speakest truth.")
Sorry - by forcing the axes, I mean that I need to suppress them and then specify axis labels. This can get pretty tedious since I want to automate the process, and I don't often have whole numbers to use on the axis. Here's what I want to plot using cgSurf:
data = elevation [25,320]
x = longitude [25,320]
y = latitude [25,320]
I've tried "cgSurf, data, x, y" and "cgSurf, data, y, x", as well as something to the effect of "cgSurf, data, x[1,*], y[1,*]"...but as I type that out, I'm realizing that I was thinking about it wrong. I needed to do "cgSurf, data, x[*,1], y[1,*]" to match dimensions.
However, I still have issues with cgContour. In that case, I've got:
data = reflectivity [1440,31]
x = time [1440]
y = height [1440,31] (or [31] if I just use one row of data)
I've tried everything I can think of to plot this, but I've had no luck.
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| Re: Axis issues, cgSurf and cgContour [message #90390 is a reply to message #90385] |
Fri, 27 February 2015 12:00 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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sam.tushaus@gmail.com writes:
> Sorry - by forcing the axes, I mean that I need to suppress them and then specify axis labels. This can get pretty tedious since I want to automate the process, and I don't often have whole numbers to use on the axis. Here's what I want to plot using cgSurf:
>
> data = elevation [25,320]
> x = longitude [25,320]
> y = latitude [25,320]
>
> I've tried "cgSurf, data, x, y" and "cgSurf, data, y, x", as well as something to the effect of "cgSurf, data, x[1,*], y[1,*]"...but as I type that out, I'm realizing that I was thinking about it wrong. I needed to do "cgSurf, data, x[*,1], y[1,*]" to match dimensions.
>
> However, I still have issues with cgContour. In that case, I've got:
>
> data = reflectivity [1440,31]
> x = time [1440]
> y = height [1440,31] (or [31] if I just use one row of data)
>
> I've tried everything I can think of to plot this, but I've had no luck.
Are you sure your [31] array is a row vector and not a column vector
[1,31], which would NOT work. That seems to be the simplest explanation,
because what you SAY you are doing would work perfectly well. :-)
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")
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| Re: Axis issues, cgSurf and cgContour [message #90397 is a reply to message #90381] |
Fri, 27 February 2015 14:05 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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sam.tushaus@gmail.com writes:
> Unfortunately no luck to that end, I just get a plot that looks striated and constant in x.
Well, my gut tells me there is nothing wrong with the code. It has been
working for people for over 25 years. We would have heard about it by
now if there was a problem.
I'm guessing you are making assumptions about your data that are just
not true. I'd start questioning and testing everything, so you are
certain you know what you are doing.
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")
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