| Bar coordinate shift with cgBarPlot [message #87738] |
Tue, 25 February 2014 12:51  |
Federico Tosi
Messages: 4
Registered: February 2014
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Junior Member |
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Hi all,
I am using Coyote's cgBarPlot to plot some vertical bars, but I'm having hard times to shift the bars of a given quantity in the horizontal direction. The BAROFFSET parameter does not do the job, because I need the bars not to be centered on a thick (i.e., I need to change their X coordinate), while BARCOORDS is an output parameter.
Is there any easy way to do that?
Thanks,
Federico
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| Re: Bar coordinate shift with cgBarPlot [message #87749 is a reply to message #87739] |
Tue, 25 February 2014 23:30  |
Federico Tosi
Messages: 4
Registered: February 2014
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Junior Member |
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I have data separated for angle range: 0°-10°, 10°-20°, 20°-30°, 30°-40°, etc.. In the Y-coordinate is the number of observed data. When cgBarPlot is used, the vertical bars are centered on: 0°, 10°, 20°, 30°, while I would like them to be centered around: 5°, 15°, 25°, etc., so that the width of the bar is representative of the range of abscissa of my data.
I'm afraid that, when the bars are cumulative (i.e., when multiple cgBarPlot are overplotted), drawing them one by one is unfeasible.
Federico
> The easiest way is probably just to draw the darn things yourself. But,
>
> I really don't understand what you are trying to do. :-)
>
> 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: Bar coordinate shift with cgBarPlot [message #87752 is a reply to message #87749] |
Wed, 26 February 2014 02:09 |
Helder Marchetto
Messages: 520
Registered: November 2011
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Senior Member |
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On Wednesday, February 26, 2014 8:30:21 AM UTC+1, Federico Tosi wrote:
> I have data separated for angle range: 0°-10°, 10°-20°, 20°-30°, 30°-40°, etc.. In the Y-coordinate is the number of observed data. When cgBarPlot is used, the vertical bars are centered on: 0°, 10°, 20°, 30°, while I would like them to be centered around: 5°, 15°, 25°, etc., so that the width of the bar is representative of the range of abscissa of my data.
>
>
>
> I'm afraid that, when the bars are cumulative (i.e., when multiple cgBarPlot are overplotted), drawing them one by one is unfeasible.
>
>
>
> Federico
>
>
>
>
>
>> The easiest way is probably just to draw the darn things yourself. But,
>
>>
>
>> I really don't understand what you are trying to do. :-)
>
>>
>
>> 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.")
I don't see a problem in doing this. If you read the documentation David has provided, then this is how I would do it: you will find two keywords you can use: barcoords and barnames (only if you want to show these).
How's this for you:
cgBarPlot, findgen(10), barcoords=findgen(10)*10.0, barnames=string(findgen(10)*10.0,format='(f0.1)')
Or if you want it centered in the middle, just change that to
cgBarPlot, findgen(10)+1.0, barcoords=findgen(10)*10.0+5.0, barnames=string(findgen(10)*10.0+5.0,format='(f0.1)')
What you have to figure out is what you give as input to cgBarPlot. If for the range 0-10 you give 0 or 10. Ideally you will want to use (low+high)/2.0. How you calculate that, depends on the input you have.
Cheers,
h
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| Re: Bar coordinate shift with cgBarPlot [message #87753 is a reply to message #87752] |
Wed, 26 February 2014 03:15 |
Federico Tosi
Messages: 4
Registered: February 2014
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Junior Member |
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Helder,
what you suggest is a clever way to get around the problem. However, I understand that BARCOORDS is an output parameter, rather than an input one, hence I don't see how you can use BARCOORDS to determine the placement of the bars on the X axis.
Even in the two examples you suggested, there is always one tick below the bar, while I really would love the bar to be placed in between two ticks. And, I cannot draw the bars one by one. That's my real issue.
Cheers,
Federico
Il giorno mercoledì 26 febbraio 2014 11:09:30 UTC+1, Helder ha scritto:
> I don't see a problem in doing this. If you read the documentation David has provided, then this is how I would do it: you will find two keywords you can use: barcoords and barnames (only if you want to show these).
>
>
>
> How's this for you:
>
> cgBarPlot, findgen(10), barcoords=findgen(10)*10.0, barnames=string(findgen(10)*10.0,format='(f0.1)')
>
>
>
> Or if you want it centered in the middle, just change that to
>
>
>
> cgBarPlot, findgen(10)+1.0, barcoords=findgen(10)*10.0+5.0, barnames=string(findgen(10)*10.0+5.0,format='(f0.1)')
>
>
>
> What you have to figure out is what you give as input to cgBarPlot. If for the range 0-10 you give 0 or 10. Ideally you will want to use (low+high)/2.0. How you calculate that, depends on the input you have.
>
>
>
> Cheers,
>
> h
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| Re: Bar coordinate shift with cgBarPlot [message #87758 is a reply to message #87753] |
Wed, 26 February 2014 05:31 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Federico Tosi writes:
> what you suggest is a clever way to get around the problem. However, I
understand that BARCOORDS is an output parameter, rather than an input
one, hence I don't see how you can use BARCOORDS to determine the
placement of the bars on the X axis.
>
> Even in the two examples you suggested, there is always one tick below the bar, while I really would love the bar to be placed in between two ticks. And, I cannot draw the bars one by one. That's my real issue.
You are not going to be able to do anything about the ticks, but maybe
something like this will work for you:
tickNames = StrArr(5)
FOR j=0,4 DO tickNames[j] = StrTrim(j*10,2) + '-' + StrTrim(j*10+10,2)
cgBarPlot, findgen(5)+1.0, barnames=ticknames
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: Bar coordinate shift with cgBarPlot [message #87763 is a reply to message #87758] |
Wed, 26 February 2014 08:52 |
Federico Tosi
Messages: 4
Registered: February 2014
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Junior Member |
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Thanks for the reply, David. In fact this works, although it is graphically inelegant when you have many bars and they are close to each other.
I wonder whether an alternative approach could exist, perhaps removing the X-axis and redesigning it (with the AXIS command) taking care of defining the ticks. However, I'm not sure this can be done in conjunction with cgBarPlot.
> You are not going to be able to do anything about the ticks, but maybe
>
> something like this will work for you:
>
>
>
> tickNames = StrArr(5)
>
> FOR j=0,4 DO tickNames[j] = StrTrim(j*10,2) + '-' + StrTrim(j*10+10,2)
>
> cgBarPlot, findgen(5)+1.0, barnames=ticknames
>
>
>
> 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: Bar coordinate shift with cgBarPlot [message #87764 is a reply to message #87763] |
Wed, 26 February 2014 09:04 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Federico Tosi writes:
> Thanks for the reply, David. In fact this works, although it is graphically inelegant when you have many bars and they are close to each other.
>
> I wonder whether an alternative approach could exist, perhaps removing the X-axis and redesigning it (with the AXIS command) taking care of defining the ticks. However, I'm not sure this can be done in conjunction with cgBarPlot.
I think I have said here several times that one of the worst programming
decisions I ever made was to do a direct translation of BarPlot to
cgBarPlot. So, yes, we have to live with our past.
If I were doing this, I would simply suppress the tick labels and add
them myself, rotated at, say, a 45 degree angle so they will fit. You
can do this with cgText. You can find code that does exactly this in the
cgBoxPlot program.
Should this feature be added to cgBarPlot. Probably. Am I going to do
it? No, not right now, unless someone is offering money. Then, I'd try
to fit it in. :-)
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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