Re: [Matplotlib-users] How adjust colors for color plots to different ranges?

[<seb...@sp...>]

I'm using pcolor.  All z values looked the same color.  It may
be a my fault (my bug) if you say colors should be different.
I'll try your customizations too.

Does clim work with pcolor?

CS

On Mon, Dec 13, 2004 at 09:23:51AM -0600, John Hunter wrote:
> >>>>> "seberino" == seberino  <seb...@sp...> writes:
>
>     seberino> The z-axis values that I want to denote with color on
>     seberino> this plot range from something like 57000 to 66000.
>
>     seberino> I think I somehow need to tell Matplotlib what these
>     seberino> minimum and maximum values are so that my color spectrum
>     seberino> can range over desired colors for my specific plotting
>     seberino> range.
>
>     seberino> How do this?  (How make 57000 be one color extreme and
>     seberino> make 66000 be my other color extreme?)
>
> What plotting function are you using, imshow, pcolor, scatter, etc?
> The matplotlib color mapping and scaling will handle this
> automatically.  It assigns 57000 to the first color on your colormap
> and 66000 to the last color, with interpolation between.  There are a
> variety of ways to customize this
>
>   # vmin is 57000 but vmax is changed
>   >>> imshow(X, vmax=70000)
>
>   # vmin is 66000 but vmin is changed
>   >>> imshow(X, vmin=50000)
>
>
>   # vmin and vmax both customized
>   >>> imshow(X, vmax=50000, vmax=70000)
>
> Once you've plotted your data, you can use the clim function to set
> the color limits
>
>   >>> clim(55000, 60000)
>
> Should help,
> JDH
>

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Christian Seberino, Ph.D.
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Phone: (619) 553-9973
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Email: seb...@sp...
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