matplotlib-users

[Matplotlib-users] subplots of matshow

[TheSaint 5. <the...@ho...>]

I am trying to create subplots with matshow. However, my code seems to be 
displaying only the last matshow image and two blank plots in separate 
figures. Can someone tell me what I am doing wrong?

from matplotlib.pylab import *

def SliceMat(N, i):
    slice = zeros( (N, N) )
    for j in range(N):
        for k in range(N):
            val = 0 # black
            if(i>j>k and ((i+j+k)%3==1)):
                val=1 # red
            if(j>k>i and ((i+j+k)%3==2)):
                val=2 # yellow
            if (k>i>j and ((i+j+k)%3==0)):
                val=3 # white
            slice[j,k] = val
    return slice

N=8


subplot(121)
slice = SliceMat(N, 2)
matshow(slice, cmap=cm.hot, origin='lower')



subplot(122)
slice = SliceMat(N, 5)
matshow(slice, cmap=cm.hot, origin='lower')

show()

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Re: [Matplotlib-users] subplots of matshow

[Eric F. <ef...@ha...>]

def matshow(*args,**kw):
     """Display an array as a matrix in a new figure window.


Matshow simply is not designed to work with subplots; it is a wrapper 
around imshow() that creates a new figure.  You should be able to do 
what you want by using imshow() directly in place of matshow with 
something like this:

nr, nc = Z.shape
extent = [-0.5, nc-0.5, nr-0.5, -0.5]
imshow(Z, extent=extent, origin='upper')

This should display the matrix with the same orientation as it has when 
printed, and with the axis ticks matching the indices.

Change or add kwargs to imshow as needed.  aspect is 'equal' by default, 
which may or may not be what you want, but it is part of what matshow 
tries to do if the matrix aspect ratio is not too far from unity.

Eric




TheSaint 555 wrote:
> I am trying to create subplots with matshow. However, my code seems to be 
> displaying only the last matshow image and two blank plots in separate 
> figures. Can someone tell me what I am doing wrong?
> 
> from matplotlib.pylab import *
> 
> def SliceMat(N, i):
>     slice = zeros( (N, N) )
>     for j in range(N):
>         for k in range(N):
>             val = 0 # black
>             if(i>j>k and ((i+j+k)%3==1)):
>                 val=1 # red
>             if(j>k>i and ((i+j+k)%3==2)):
>                 val=2 # yellow
>             if (k>i>j and ((i+j+k)%3==0)):
>                 val=3 # white
>             slice[j,k] = val
>     return slice
> 
> N=8
> 
> 
> subplot(121)
> slice = SliceMat(N, 2)
> matshow(slice, cmap=cm.hot, origin='lower')
> 
> 
> 
> subplot(122)
> slice = SliceMat(N, 5)
> matshow(slice, cmap=cm.hot, origin='lower')
> 
> show()
> 
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Re: [Matplotlib-users] subplots of matshow

[TheSaint 5. <the...@ho...>]

That worked. Thanx a lot Eric. I just had to also add 
interpolation='nearest' in imshow() and it worked just like matshow did.


>From: Eric Firing <ef...@ha...>
>To: TheSaint 555 <the...@ho...>
>CC: mat...@li...
>Subject: Re: [Matplotlib-users] subplots of matshow
>Date: Mon, 04 Dec 2006 14:42:20 -1000
>
>def matshow(*args,**kw):
>     """Display an array as a matrix in a new figure window.
>
>
>Matshow simply is not designed to work with subplots; it is a wrapper 
>around imshow() that creates a new figure.  You should be able to do what 
>you want by using imshow() directly in place of matshow with something like 
>this:
>
>nr, nc = Z.shape
>extent = [-0.5, nc-0.5, nr-0.5, -0.5]
>imshow(Z, extent=extent, origin='upper')
>
>This should display the matrix with the same orientation as it has when 
>printed, and with the axis ticks matching the indices.
>
>Change or add kwargs to imshow as needed.  aspect is 'equal' by default, 
>which may or may not be what you want, but it is part of what matshow tries 
>to do if the matrix aspect ratio is not too far from unity.
>
>Eric
>
>
>
>
>TheSaint 555 wrote:
>>I am trying to create subplots with matshow. However, my code seems to be 
>>displaying only the last matshow image and two blank plots in separate 
>>figures. Can someone tell me what I am doing wrong?
>>
>>from matplotlib.pylab import *
>>
>>def SliceMat(N, i):
>>     slice = zeros( (N, N) )
>>     for j in range(N):
>>         for k in range(N):
>>             val = 0 # black
>>             if(i>j>k and ((i+j+k)%3==1)):
>>                 val=1 # red
>>             if(j>k>i and ((i+j+k)%3==2)):
>>                 val=2 # yellow
>>             if (k>i>j and ((i+j+k)%3==0)):
>>                 val=3 # white
>>             slice[j,k] = val
>>     return slice
>>
>>N=8
>>
>>
>>subplot(121)
>>slice = SliceMat(N, 2)
>>matshow(slice, cmap=cm.hot, origin='lower')
>>
>>
>>
>>subplot(122)
>>slice = SliceMat(N, 5)
>>matshow(slice, cmap=cm.hot, origin='lower')
>>
>>show()
>>
>>_________________________________________________________________
>>Connect with your friends who use Yahoo! Messenger with Voice. Click! 
>>http://www.msnspecials.in/wlmyahoo/index.asp
>>
>>
>>-------------------------------------------------------------------------
>>Take Surveys. Earn Cash. Influence the Future of IT
>>Join SourceForge.net's Techsay panel and you'll get the chance to share 
>>your
>>opinions on IT & business topics through brief surveys - and earn cash
>>http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
>>_______________________________________________
>>Matplotlib-users mailing list
>>Mat...@li...
>>https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>

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