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Re: Adding straight lines to a plot [message #73555 is a reply to message #73474]

Fri, 12 November 2010 06:59

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Paul van Delst writes:

>
> David Fanning wrote:
>> fgg writes:
>>
>>> Is there a function in IDL to add a straight line through an existing
>>> plot? Something like the 'abline' function in R, where all you need is
>>> to specify the y-value for a horizontal line (or the x-value for a
>>> vertical line).
>>
>> Here you go.
>>
>> PRO ABLine, value, $
>> VERTICAL=vertical, $
>> LINESTYLE=linestyle, $
>> THICK=thick, $
>> COLOR=color
>>
>> IF N_Elements(color) EQ 0 THEN color = 'white'
>>
>> IF Keyword_Set(Vertical) THEN BEGIN
>> PLOTS, [value, value], [!Y.CRange[0], !Y.CRange[1]], $
>
> why not simply
> PLOTS, [value, value], !Y.CRange, $
>
>> LINESTYLE=linestyle, THICK=thick, $
>> COLOR=FSC_Color(String(color))
>> ENDIF ELSE BEGIN
>> PLOTS, [!X.CRange[0], !X.CRange[1]], [value, value], $
>
> and similarly
> PLOTS, !X.CRange, [value, value], $
>
> ?

Pedantry. :-)

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Adding straight lines to a plot By: fgg on Thu, 11 November 2010 14:28
		Re: Adding straight lines to a plot By: David Fanning on Fri, 12 November 2010 06:59
		Re: Adding straight lines to a plot By: Gray on Fri, 12 November 2010 06:37

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