| Re: I'm a beginner, IDL question plot, max_value [message #81892 is a reply to message #81802] |
Fri, 26 October 2012 13:00  |
chris_torrence@NOSPAM
Messages: 528
Registered: March 2007
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Senior Member |
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On Thursday, October 25, 2012 5:06:18 PM UTC-6, David Fanning wrote:
> Mati writes:
>
>
>
>> I've got an ascii file with lots of rows and columns, I must select 2 columns,x and y,plot them and set max and min value to exclude bad data points.
>
>> Here is what I've made(it works,but I don't know if it's the best way to do it):
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>>
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>> data=read_ascii('')
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>> x=data.field01[6,*]
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>> y=data.field01[14,*]
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>> plot,x,y,max_value=40,min_value=0
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>>
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>> the problem is: max_value and min_value gives extremes to pick up data only for y variable...how can I do to set also max_value and min_value for x???
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>
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> You typically set the XRange keyword to change the x values
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> that are plotted on the plot. You have to be careful, though,
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> since IDL will "autoscale" the axes. This is sometimes what
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> you want and sometimes not. If you want to turn it off, you
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> also have to set the [XY]Style keywords:
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>
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> cgPlot, x, y, XRANGE=[20,64], YRANGE=[0,40], XSTYLE=1, YSTYLE=1
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>
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> Sometimes, it is easier to just do this interactively by
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> drawing a rubberband box around the part of the plot you
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> want to "zoom into":
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>
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> cgZPlot, x, y
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> Cheers,
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>
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> David
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>
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>
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> --
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> David Fanning, Ph.D.
>
> Fanning Software Consulting, Inc.
>
> Coyote's Guide to IDL Programming: http://www.dfanning.com/
>
> Sepore ma de ni thue. ("Perhaps thos speakest truth.")
Or, in new graphics:
p = plot(findgen(100), randomu(seed,100), xrange=[10,90], yrange=[0.2,0.8])
:-)
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