matplotlib-users

[Matplotlib-users] More than one subplot fails when embedding in Tk

[Delbert D. F. <dd...@lk...>]

I have made great progress with my GUI to plot time-series files from
my unsteady-flow modeling software.  It works when I have one subplot
per figure but I have not been able to get two subplots (211 and 212)
to work.  Only the lower subplot appears and the trace or line assigned to 
the upper subplot (211) appears in the lower subplot.  The space for the 
upper subplot appears as blank space in the figure.  

I'm a little unsure of how to embed multiple subplots using Tk.  I 
based what I did on examples using pylab and tried to translate them
to my case.  Here's  the code that does the work.  The fg.fgs..., is 
a data structure that holds various descriptive items for the figure,
subplot, and the various traces.  The case that fails has 2 subplots
with one trace per subplot. file_list holds various file-related objects
that get the data from one or more files when it is needed. 

    ifg = 0
    win = Toplevel(bd=5, relief=RIDGE)
    win.title(fg.fgs[ifg].name)

    # Try to setup useful time-series axis
    days = DayLocator(range(1,32))
    hours = HourLocator((6,12,18))
    timeformat = DateFormatter('%d %b %y')
    
    w = int(fg.fgs[ifg].width)
    h = int(fg.fgs[ifg].height)
    f = Figure(figsize=(w, h), dpi=120)
    nsp = len(fg.fgs[ifg].sp)
#    ax = []
    for isp in xrange(nsp):
        ax = f.add_subplot(fg.fgs[ifg].sp[isp].loc_code)  
        ntr = len(fg.fgs[ifg].sp[isp].tr)
        for itr in xrange(ntr):
            i = fg.fgs[ifg].sp[isp].tr[itr].file_index
            jt_0, f_0 = file_list[i].get_ts_segment()        
            jt_0 += 678576.0
            ax.plot_date(jt_0, f_0,  fg.fgs[ifg].sp[isp].tr[itr].plot_code)
    
        ax.xaxis.set_major_locator(days)
        ax.xaxis.set_minor_locator(hours)
        ax.autoscale_view()

        labels = ax.get_xticklabels()
        ax.xaxis.set_major_formatter(timeformat)
        set(labels, rotation=85)


        ax.set_xlabel(fg.fgs[ifg].sp[isp].xlabel)
        ax.set_ylabel(fg.fgs[ifg].sp[isp].ylabel)
        ax.grid(True)

    ax.set_title(fg.fgs[ifg].title)

    canvas = FigureCanvasTkAgg(f, master=win)
    canvas.show()
 
    canvas.get_tk_widget().pack(side=TOP, fill=BOTH, expand=1)
  
 
    toolbar = NavigationToolbar( canvas, win )
    toolbar.update()
    canvas._tkcanvas.pack(side=TOP, fill=BOTH, expand=1)
    canvas._tkcanvas.pack(side=TOP,  expand=1)

    canvas.print_figure('test.ps', dpi=300, orientation='landscape')


I'm finding that Python and matplotlib are fun to use but I'm still low 
on the learning curve.  However, I already have a usable package and can 
now start adding refinements and extensions. 

                             Thanks, 
                               Delbert Franz

Re: [Matplotlib-users] More than one subplot fails when embedding in Tk

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

>>>>> "Delbert" == Delbert D Franz <dd...@lk...> writes:

    Delbert> I have made great progress with my GUI to plot
    Delbert> time-series files from my unsteady-flow modeling
    Delbert> software.  It works when I have one subplot per figure
    Delbert> but I have not been able to get two subplots (211 and
    Delbert> 212) to work.  Only the lower subplot appears and the
    Delbert> trace or line assigned to the upper subplot (211) appears
    Delbert> in the lower subplot.  The space for the upper subplot
    Delbert> appears as blank space in the figure.

You code looks correct on first glance (except did you mean tht title
to be in the loop?) .  My guess is your data structure has a bug in
it.  Add a print statement and make sure the loc code is as you think
it is.

        print fg.fgs[ifg].sp[isp].loc_code
        ax = f.add_subplot(fg.fgs[ifg].sp[isp].loc_code)  

If they are correct, you need to compose a minimum, free standing
script that replicates your problem and I can take a look.

Hope this helps,
JDH

Re: [Matplotlib-users] More than one subplot fails when embedding in Tk

[Delbert D. F. <dd...@lk...>]

John, 

Thanks for the tip.  I had thought of checking that as well as I 
drifted off to sleep.  That was it-in spades.   I had 
input two different subplot codes but somehow only one got saved. 
Then I got suckered in by the simplicity of initializing
the list using [ 2*Subpdata() ] where Subpdata is a class
defining the various attributes of a subplot in my program. 
However, I soon found out that this made my problem worse;
Python went into an endless loop.  Again, this gave me two
subplot codes but they were the same.   The simple list 
initialization binds the same instance object to the two 
list entries.  Not what I wanted.  After using a for statement
to initialize, I got my two subplots.  

I am now able to create multiple figures, each with one or more
subplots with my software.  What a great collection of software. 
Thanks for all the work. 

I tried using mx.datetime to create an mx.datetime instance
which worked fine. However, mx2num() fails with python 
claiming an undefined mxdates.  I checked the source and 
found only one  mxdates.  No idea how it should be defined. 
In the mean time I am using a datetime instance but I lose
a small bit of precision with only integer seconds. 

                            Delbert

 
On Tuesday 01 February 2005 05:38 am, John Hunter wrote:
> >>>>> "Delbert" == Delbert D Franz <dd...@lk...> writes:
> 
>     Delbert> I have made great progress with my GUI to plot
>     Delbert> time-series files from my unsteady-flow modeling
>     Delbert> software.  It works when I have one subplot per figure
>     Delbert> but I have not been able to get two subplots (211 and
>     Delbert> 212) to work.  Only the lower subplot appears and the
>     Delbert> trace or line assigned to the upper subplot (211) appears
>     Delbert> in the lower subplot.  The space for the upper subplot
>     Delbert> appears as blank space in the figure.
> 
> You code looks correct on first glance (except did you mean tht title
> to be in the loop?) .  My guess is your data structure has a bug in
> it.  Add a print statement and make sure the loc code is as you think
> it is.
> 
>         print fg.fgs[ifg].sp[isp].loc_code
>         ax = f.add_subplot(fg.fgs[ifg].sp[isp].loc_code)  
> 
> If they are correct, you need to compose a minimum, free standing
> script that replicates your problem and I can take a look.
> 
> Hope this helps,
> JDH
> 
> 

Re: [Matplotlib-users] More than one subplot fails when embedding in Tk

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

>>>>> "Delbert" == Delbert D Franz <dd...@lk...> writes:

    Delbert> I am now able to create multiple figures, each with one
    Delbert> or more subplots with my software.  What a great
    Delbert> collection of software.  Thanks for all the work.

Great, glad it helped.  I was pretty sure that was the answer.

    Delbert> I tried using mx.datetime to create an mx.datetime
    Delbert> instance which worked fine. However, mx2num() fails with
    Delbert> python claiming an undefined mxdates.  I checked the
    Delbert> source and found only one mxdates.  No idea how it should
    Delbert> be defined.  In the mean time I am using a datetime
    Delbert> instance but I lose a small bit of precision with only
    Delbert> integer seconds.

Oops, replace mx2num in matplotlib/dates.py with 

def mx2num(mxdates):
    """
    Convert mx datetime instance (or sequence of mx instances) to the
    new date format,
    """
    scalar = False
    if not iterable(mxdates):
        scalar = True
        mxdates = [mxdates]
    ret = epoch2num([m.ticks() for m in mxdates])
    if scalar: return ret[0]
    else: return ret


Thanks for the report!
JDH