matplotlib-users

[Matplotlib-users] imshow with different axes

[Jeffery D. C. <Jef...@ve...>]

Is there a (convenient) matplotlib(v0.60.2) equivalent to the matlab 
imshow(x,y,A), where x and y are 2-tuples consisting of the bounds of the x 
and y axes, respectively?  I have done some limited axis manipulation using 
the set_xticklabels and set_yticklabels methods, but that results in an 
unattractive plot.

Thanks!
-- 
Jeff

Re: [Matplotlib-users] imshow with different axes

[John H. <jdh...@ac...>]

>>>>> "Jeffery" == Jeffery D Collins <Jef...@ve...> writes:

    Jeffery> Is there a (convenient) matplotlib(v0.60.2) equivalent to
    Jeffery> the matlab imshow(x,y,A), where x and y are 2-tuples
    Jeffery> consisting of the bounds of the x and y axes,
    Jeffery> respectively?  I have done some limited axis manipulation
    Jeffery> using the set_xticklabels and set_yticklabels methods,
    Jeffery> but that results in an unattractive plot.

If I am understanding you correctly

  >>> imshow(A, extent=(xmin, ymin, xmax, ymax))

See also http://matplotlib.sf.net/matplotlib.matlab.html#-imshow and
http://matplotlib.sf.net/examples/image_demo2.py.

Hope this helps,
JDH

Re: [Matplotlib-users] imshow with different axes

[Jeffery D. C. <Jef...@ve...>]

On Thursday 22 July 2004 12:03 pm, John Hunter wrote:
> >>>>> "Jeffery" == Jeffery D Collins <Jef...@ve...> writes:
>
>     Jeffery> Is there a (convenient) matplotlib(v0.60.2) equivalent to
>     Jeffery> the matlab imshow(x,y,A), where x and y are 2-tuples
>     Jeffery> consisting of the bounds of the x and y axes,
>     Jeffery> respectively?  I have done some limited axis manipulation
>     Jeffery> using the set_xticklabels and set_yticklabels methods,
>     Jeffery> but that results in an unattractive plot.
>

I'm getting an unexpected keyword error on 'extent'.  Is this keyword 
available in the latest release or just in CVS?

> If I am understanding you correctly
>
>   >>> imshow(A, extent=(xmin, ymin, xmax, ymax))
>
> See also http://matplotlib.sf.net/matplotlib.matlab.html#-imshow and
> http://matplotlib.sf.net/examples/image_demo2.py.
>
> Hope this helps,
> JDH

-- 
-----------------------------------------------------------------
Jeffery D. Collins, Ph.D.                      Vexcel Corp.
Sr. Engineer                                   1690 38th St.
Voice: (303)583-0228                           Boulder, CO 80301
Fax:   (303)583-0246                           vexcel.com

Re: [Matplotlib-users] imshow with different axes

[John H. <jdh...@ac...>]

>>>>> "Jeffery" == Jeffery D Collins <Jef...@ve...> writes:

    Jeffery> I'm getting an unexpected keyword error on 'extent'.  Is
    Jeffery> this keyword available in the latest release or just in
    Jeffery> CVS?

I must be getting soft in the head.  I thought this was in the 0.60.2
release, but you're right, it is not.  Just checked the CHANGELOG.
There is a way to do it in 0.60.2, but it is deprecated in CVS.
Arggg.

Your choices

  * wait for 0.61 (next week)

  * build from CVS - best solution.  Fixes some problems with image
    extent plus image.origin='lower' reported earlier on
    matplotlib-users.

  * use the (deprecated in CVS/0.61)
    
     im = imshow(A)
     gca().set_image_extent(0, 25, 0, 25)

Sorry for the confusions,
JDH    
    

Re: [Matplotlib-users] imshow with different axes

[Jeffery D. C. <Jef...@ve...>]

I grabbed the CVS version and it works fine.  Thanks for the help!


On Thursday 22 July 2004 12:45 pm, John Hunter wrote:
> >>>>> "Jeffery" == Jeffery D Collins <Jef...@ve...> writes:
>
>     Jeffery> I'm getting an unexpected keyword error on 'extent'.  Is
>     Jeffery> this keyword available in the latest release or just in
>     Jeffery> CVS?
>
> I must be getting soft in the head.  I thought this was in the 0.60.2
> release, but you're right, it is not.  Just checked the CHANGELOG.
> There is a way to do it in 0.60.2, but it is deprecated in CVS.
> Arggg.
>
> Your choices
>
>   * wait for 0.61 (next week)
>
>   * build from CVS - best solution.  Fixes some problems with image
>     extent plus image.origin='lower' reported earlier on
>     matplotlib-users.
>
>   * use the (deprecated in CVS/0.61)
>
>      im = imshow(A)
>      gca().set_image_extent(0, 25, 0, 25)
>
> Sorry for the confusions,
> JDH

-- 
-----------------------------------------------------------------
Jeffery D. Collins, Ph.D.                      Vexcel Corp.
Sr. Engineer                                   1690 38th St.
Voice: (303)583-0228                           Boulder, CO 80301
Fax:   (303)583-0246                           vexcel.com