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formatting y-axis when plotting relative frequency using cgHistoplot [message #91230]

Thu, 18 June 2015 13:23

Steve Super
Messages: 13
Registered: August 2014

Junior Member

I'm trying to determine if there is a simple way to control the y-axis labels when using the relative frequency keyword with cgHistoplot.

I know IDL format codes can be used with the ytickformat keyword, however what I am hoping to do is display the relative frequency as a percentage instead of in decimal form. (e.g. 1.5% versus 0.015)

The simplest option would be a keyword to set the y axis to be in %, however it doesn't appear that's possible. Does anyone know if there a way to output the label values used to an array? That way they can be converted to a percentage and then be explicitly set using the yticknames keyword?

-Steve

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Re: formatting y-axis when plotting relative frequency using cgHistoplot [message #91231 is a reply to message #91230]

Thu, 18 June 2015 13:42

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Steve Super writes:

> I'm trying to determine if there is a simple way to control the y-axis labels when using the relative frequency keyword with cgHistoplot.
>
> I know IDL format codes can be used with the ytickformat keyword, however what I am hoping to do is display the relative frequency as a percentage instead of in decimal form. (e.g. 1.5% versus 0.015)
>
> The simplest option would be a keyword to set the y axis to be in %, however it doesn't appear that's possible. Does anyone know if there a way to output the label values used to an array? That way they can be converted to a percentage and then be explicitly set using the yticknames keyword?

Have you tried the usual method of setting the YTickFormat keyword to
the name of a function you write to format the axis is any way you see
fit?

See the documentation for the [XYZ]Tickformat graphics keyword for
examples.

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: formatting y-axis when plotting relative frequency using cgHistoplot [message #91232 is a reply to message #91230]

Thu, 18 June 2015 13:53

Yngvar Larsen
Messages: 134
Registered: January 2010

Senior Member

On Thursday, 18 June 2015 22:23:05 UTC+2, Steve Super wrote:
> I'm trying to determine if there is a simple way to control the y-axis labels when using the relative frequency keyword with cgHistoplot.
>
> I know IDL format codes can be used with the ytickformat keyword, however what I am hoping to do is display the relative frequency as a percentage instead of in decimal form. (e.g. 1.5% versus 0.015)
>
> The simplest option would be a keyword to set the y axis to be in %, however it doesn't appear that's possible.

You can do that with YTICKFORMAT.

plot, dindgen(100), ytickformat='(I0, "%")'

(or something very similar with cgHistoPlot, since I assume it supports the same keywords as PLOT.)

Does anyone know if there a way to output the label values used to an array? That way they can be converted to a percentage and then be explicitly set using the yticknames keyword?

plot, dindgen(100), ytick_get=yvalues

But you don't need to do that, see above.

--
Yngvar

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Re: formatting y-axis when plotting relative frequency using cgHistoplot [message #91236 is a reply to message #91230]

Fri, 19 June 2015 06:22

Steve Super
Messages: 13
Registered: August 2014

Junior Member

Great, thanks for the tips on using format functions.

-Steve

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