matplotlib-users

[Matplotlib-users] Multiplot with one colorbar

[Dyah r. m. <dya...@gm...>]

Hello all,

I make multi plot with colorbars. I need help, how do make only one
colorbar for six panels? I also want to show only lowest x-axis. I copy my
recent code and  figure here.

   # Open file
    fd = nc.Dataset(fname, 'r')

    # Read variables
    beam = fd.variables['beam'][:]
    rng = fd.variables['range'][:]
    tim = fd.variables['time'][:]
    pwr = fd.variables['pwr'][:]
    nfft = fd.variables['nfft'][0]
    pn = fd.variables['pnoise'][:]
    width=fd.variables['width'][:]
    # Close netCDF file
    fd.close()

    # Specify beam
    ibeam = ibeams[i]

    # Time convertion
    tim = tim/3600.0

    #Plot
    p_plot = pwr[ibeam]
    for it in range(len(tim)):
        p_plot[it] = p_plot[it] - pn[ibeam][it] - 10.*np.log10(nfft)
    p_plot = p_plot.transpose()

#Specify subplot
    pl.subplot(611 + i)
#Contour plot
    v= np.linspace(5., 50., 5., endpoint=True)
    x= pl.contourf(tim, rng, p_plot, v, cmap=pl.cm.jet)
    x = pl.colorbar(ticks=v)
    x.ax.set_title('dB')
    print x


# Set X and Y axis lower/uppser limit
    set_xy = range(4)
    set_xy[0] = 18.0 # x min
    set_xy[1] = 30.0 # x max
    set_xy[2] = 200.0 # y min
    set_xy[3] = 550.0 # y max
    pl.axis(set_xy)

# Set labels
    pl.xlabel('time (hours)')
    pl.ylabel('range (km)')
    pl.show()


Thank you....

Re: [Matplotlib-users] Multiplot with one colorbar

[Arnaldo R. <arn...@gm...>]

Hi,
.
Your example is not much clear. It's better post some short example and a
running piece of code.
btw, maybe your problem should be solved with this post:
http://stackoverflow.com/questions/13784201/matplotlib-2-subplots-1-colorbar

Cheers,
Arnaldo


---
*Arnaldo D'Amaral Pereira Granja Russo*
Lab. de Estudos dos Oceanos e Clima
Instituto de Oceanografia - FURG



2015-03-06 6:36 GMT-03:00 Dyah rahayu martiningrum <dya...@gm...>:

> Hello all,
>
> I make multi plot with colorbars. I need help, how do make only one
> colorbar for six panels? I also want to show only lowest x-axis. I copy my
> recent code and  figure here.
>
>    # Open file
>     fd = nc.Dataset(fname, 'r')
>
>     # Read variables
>     beam = fd.variables['beam'][:]
>     rng = fd.variables['range'][:]
>     tim = fd.variables['time'][:]
>     pwr = fd.variables['pwr'][:]
>     nfft = fd.variables['nfft'][0]
>     pn = fd.variables['pnoise'][:]
>     width=fd.variables['width'][:]
>     # Close netCDF file
>     fd.close()
>
>     # Specify beam
>     ibeam = ibeams[i]
>
>     # Time convertion
>     tim = tim/3600.0
>
>     #Plot
>     p_plot = pwr[ibeam]
>     for it in range(len(tim)):
>         p_plot[it] = p_plot[it] - pn[ibeam][it] - 10.*np.log10(nfft)
>     p_plot = p_plot.transpose()
>
> #Specify subplot
>     pl.subplot(611 + i)
> #Contour plot
>     v= np.linspace(5., 50., 5., endpoint=True)
>     x= pl.contourf(tim, rng, p_plot, v, cmap=pl.cm.jet)
>     x = pl.colorbar(ticks=v)
>     x.ax.set_title('dB')
>     print x
>
>
> # Set X and Y axis lower/uppser limit
>     set_xy = range(4)
>     set_xy[0] = 18.0 # x min
>     set_xy[1] = 30.0 # x max
>     set_xy[2] = 200.0 # y min
>     set_xy[3] = 550.0 # y max
>     pl.axis(set_xy)
>
> # Set labels
>     pl.xlabel('time (hours)')
>     pl.ylabel('range (km)')
>     pl.show()
>
>
> Thank you....
>
>
>
> ------------------------------------------------------------------------------
> Dive into the World of Parallel Programming The Go Parallel Website,
> sponsored
> by Intel and developed in partnership with Slashdot Media, is your hub for
> all
> things parallel software development, from weekly thought leadership blogs
> to
> news, videos, case studies, tutorials and more. Take a look and join the
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>
>

Re: [Matplotlib-users] Multiplot with one colorbar

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

On 2015/03/05 11:36 PM, Dyah rahayu martiningrum wrote:
> Hello all,
>
> I make multi plot with colorbars. I need help, how do make only one
> colorbar for six panels? I also want to show only lowest x-axis. I copy
> my recent code and  figure here.

An old example of something like this is here:

http://matplotlib.org/examples/pylab_examples/multi_image.html

Eric

Re: [Matplotlib-users] Multiplot with one colorbar

[Jody K. <jk...@uv...>]

Hi,

I guess I don't understand the "[axx for axx in ax.flat]" command, but this steals from all the axes.

Cheers,   Jody

fig,ax = plt.subplots(2,2)
for i in range(2):
    for j in range(2):
        im=ax[i,j].imshow(np.ones((20,20)))
        im.set_clim([-1.,2.])
cax,kw = mpl.colorbar.make_axes([axx for axx in ax.flat],shrink=0.5)
plt.colorbar(im, cax=cax, **kw)


> On Mar 6, 2015, at  9:39 AM, Eric Firing <ef...@ha...> wrote:
> 
> On 2015/03/05 11:36 PM, Dyah rahayu martiningrum wrote:
>> Hello all,
>> 
>> I make multi plot with colorbars. I need help, how do make only one
>> colorbar for six panels? I also want to show only lowest x-axis. I copy
>> my recent code and  figure here.
> 
> An old example of something like this is here:
> 
> http://matplotlib.org/examples/pylab_examples/multi_image.html
> 
> Eric
> 
> ------------------------------------------------------------------------------
> Dive into the World of Parallel Programming The Go Parallel Website, sponsored
> by Intel and developed in partnership with Slashdot Media, is your hub for all
> things parallel software development, from weekly thought leadership blogs to
> news, videos, case studies, tutorials and more. Take a look and join the 
> conversation now. http://goparallel.sourceforge.net/
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users

Re: [Matplotlib-users] Multiplot with one colorbar

[Dyah r. m. <dya...@gm...>]

Thank you so much Jody, Eric, Arnaldo, and Joy.
I will try your suggestion.


Dyah

On Sat, Mar 7, 2015 at 5:21 AM, Jody Klymak <jk...@uv...> wrote:

> Hi,
>
> I guess I don't understand the "[axx for axx in ax.flat]" command, but
> this steals from all the axes.
>
> Cheers,   Jody
>
> fig,ax = plt.subplots(2,2)
> for i in range(2):
>     for j in range(2):
>         im=ax[i,j].imshow(np.ones((20,20)))
>         im.set_clim([-1.,2.])
> cax,kw = mpl.colorbar.make_axes([axx for axx in ax.flat],shrink=0.5)
> plt.colorbar(im, cax=cax, **kw)
>
>
> > On Mar 6, 2015, at  9:39 AM, Eric Firing <ef...@ha...> wrote:
> >
> > On 2015/03/05 11:36 PM, Dyah rahayu martiningrum wrote:
> >> Hello all,
> >>
> >> I make multi plot with colorbars. I need help, how do make only one
> >> colorbar for six panels? I also want to show only lowest x-axis. I copy
> >> my recent code and  figure here.
> >
> > An old example of something like this is here:
> >
> > http://matplotlib.org/examples/pylab_examples/multi_image.html
> >
> > Eric
> >
> >
> ------------------------------------------------------------------------------
> > Dive into the World of Parallel Programming The Go Parallel Website,
> sponsored
> > by Intel and developed in partnership with Slashdot Media, is your hub
> for all
> > things parallel software development, from weekly thought leadership
> blogs to
> > news, videos, case studies, tutorials and more. Take a look and join the
> > conversation now. http://goparallel.sourceforge.net/
> > _______________________________________________
> > Matplotlib-users mailing list
> > Mat...@li...
> > https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
>
>
> ------------------------------------------------------------------------------
> Dive into the World of Parallel Programming The Go Parallel Website,
> sponsored
> by Intel and developed in partnership with Slashdot Media, is your hub for
> all
> things parallel software development, from weekly thought leadership blogs
> to
> news, videos, case studies, tutorials and more. Take a look and join the
> conversation now. http://goparallel.sourceforge.net/
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>



-- 

===============================================
Dyah R Martiningrum
Student at Department of Communications and Computer Engineering
Graduate School of Informatics, Kyoto University
RISH, Gokasho, Uji shi, Kyoto, 611-0011, Japan.
Office : +81 0774 38 3856
Mobile : +81 090 6676 1981
===============================================

Re: [Matplotlib-users] Multiplot with one colorbar

[Jody K. <jk...@uv...>]

Hi all,

Just to follow up, I wrote the following helper function to put a single colorbar to the right of a) an axes, b) a list of axes, c) to the right of a gridspec.  I was getting a little peeved with colorbar not working as I liked with subplots or gridspec, and this kind of does the trick for me for most of my use cases. 

I’m probably not the world’s best python programmer so feel free to make clearer.

Cheers,  Jody

def colorbarRight(pcm,ax,fig,shrink=0.7,width=0.025,gap=0.03,**kwargs):
    '''
    def colorbarRight(pcm,ax,fig,shrink=0.7,width=0.05,gap=0.02)
    
    Position colorbar to the right of axis 'ax' with colors from artist pcm.
    ax can be an array of axes such as that returned by "subplots".
    
    ax can also be a GridSpec, in which case the colorbar is centered to the
    right of the grid.  
    
    Defaults might no leave enough room for the colorbar on the right side, so 
    you should probably use subplots_adjust() or gridspec_update() to make more 
    space to the right:
    
    # with subplots:
    import matplotlib.pyplot as plt
    fig,ax=plt.subplots(2,2)
    fig.subplots_adjust(right=0.87)
    for axx in ax.flatten():
        pcm=axx.pcolormesh(rand(10,10))
    colorbarRight(pcm,ax,fig,extend='max')
    
    # with gridspec:
    import matplotlib.gridspec 
    import matplotlib.pyplot as plt
    fig=plt.figure()

    gs = gridspec.GridSpec(2,2)
    gs.update(right=0.87)
    for ii in range(2):
        for jj in range(2):
            ax=plt.subplot(gs[ii,jj])
            pcm=ax.pcolormesh(rand(10,10))
    colorbarRight(pcm,gs,fig,extend='max')
    '''
    import numpy as np

    if type(ax) is matplotlib.gridspec.GridSpec:
        # gridspecs are different than axes:
        pos = ax.get_grid_positions(fig)
        y0 = pos[0][-1]
        y1 = pos[1][0]
        x1 = pos[3][-1]
    else: 
        if ~(type(ax) is np.ndarray):
            # these are supposedly axes:
            ax=np.array(ax)
        # get max x1, min y0 and max y1
        y1 = 0.
        y0 = 1.
        x1=0.
        for axx in ax.flatten():
            pos=axx.get_position()
            x1=np.max([pos.x1,x1])
            y1=np.max([pos.y1,y1])
            y0=np.min([pos.y0,y0])
    height = y1-y0
    pos2 = [x1 + gap, y0 + (1.-shrink)*height/2.,  width, height*shrink]
    cax=axes(position=pos2)
    fig.colorbar(pcm,cax=cax,**kwargs)


> On 11 Mar 2015, at  19:43 PM, Dyah rahayu martiningrum <dya...@gm...> wrote:
> 
> Thank you so much Jody, Eric, Arnaldo, and Joy.
> I will try your suggestion.
> 
> 
> Dyah
> 
> On Sat, Mar 7, 2015 at 5:21 AM, Jody Klymak <jk...@uv... <mailto:jk...@uv...>> wrote:
> Hi,
> 
> I guess I don't understand the "[axx for axx in ax.flat]" command, but this steals from all the axes.
> 
> Cheers,   Jody
> 
> fig,ax = plt.subplots(2,2)
> for i in range(2):
>     for j in range(2):
>         im=ax[i,j].imshow(np.ones((20,20)))
>         im.set_clim([-1.,2.])
> cax,kw = mpl.colorbar.make_axes([axx for axx in ax.flat],shrink=0.5)
> plt.colorbar(im, cax=cax, **kw)
> 
> 
> > On Mar 6, 2015, at  9:39 AM, Eric Firing <ef...@ha... <mailto:ef...@ha...>> wrote:
> >
> > On 2015/03/05 11:36 PM, Dyah rahayu martiningrum wrote:
> >> Hello all,
> >>
> >> I make multi plot with colorbars. I need help, how do make only one
> >> colorbar for six panels? I also want to show only lowest x-axis. I copy
> >> my recent code and  figure here.
> >
> > An old example of something like this is here:
> >
> > http://matplotlib.org/examples/pylab_examples/multi_image.html <http://matplotlib.org/examples/pylab_examples/multi_image.html>
> >
> > Eric
> >
> > ------------------------------------------------------------------------------
> > Dive into the World of Parallel Programming The Go Parallel Website, sponsored
> > by Intel and developed in partnership with Slashdot Media, is your hub for all
> > things parallel software development, from weekly thought leadership blogs to
> > news, videos, case studies, tutorials and more. Take a look and join the
> > conversation now. http://goparallel.sourceforge.net/ <http://goparallel.sourceforge.net/>
> > _______________________________________________
> > Matplotlib-users mailing list
> > Mat...@li... <mailto:Mat...@li...>
> > https://lists.sourceforge.net/lists/listinfo/matplotlib-users <https://lists.sourceforge.net/lists/listinfo/matplotlib-users>
> 
> 
> ------------------------------------------------------------------------------
> Dive into the World of Parallel Programming The Go Parallel Website, sponsored
> by Intel and developed in partnership with Slashdot Media, is your hub for all
> things parallel software development, from weekly thought leadership blogs to
> news, videos, case studies, tutorials and more. Take a look and join the
> conversation now. http://goparallel.sourceforge.net/ <http://goparallel.sourceforge.net/>
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li... <mailto:Mat...@li...>
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users <https://lists.sourceforge.net/lists/listinfo/matplotlib-users>
> 
> 
> 
> -- 
> 
> ===============================================
> Dyah R Martiningrum
> Student at Department of Communications and Computer Engineering
> Graduate School of Informatics, Kyoto University
> RISH, Gokasho, Uji shi, Kyoto, 611-0011, Japan.
> Office : +81 0774 38 3856
> Mobile : +81 090 6676 1981
> ===============================================

--
Jody Klymak    
http://web.uvic.ca/~jklymak/