gmane.comp.python.matplotlib.general

A row gets deleted when using plt.imsave

Oliver — 2013-06-18T23:54:50

I'm running the following on mpl 1.2.1:

    import matplotlib.pyplot as plt
    import numpy as np

    A = np.arange(1020*1368*3, dtype=np.uint8).reshape(1020, 1368, 3)
    plt.imsave('dimcheck.png', A)

The OS tells me the picture has 1019x1368px. So one row is missing. It
works fine for e.g. 10x10x3, I'm not yet sure why it does this for this
specific dimension. PIL's save method works fine, as does pypng.

I can't check the behaviour on my other machine for now, because that one
has mpl 1.1.1 and plt.imsave apparently did not yet support 24-bit RGB
writing at that time (in 1.1.1: TypeError: from_bounds() takes exactly 4
arguments (5 given)).

Is this a bug or is there something wrong with my setup?
------------------------------------------------------------------------------
This SF.net email is sponsored by Windows:

Build for Windows Store.

http://p.sf.net/sfu/windows-dev2dev_______________________________________________
Matplotlib-users mailing list
Matplotlib-users-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5

Re: savefig

Sudheer Joseph — 2013-06-15T12:25:36

Thank you,
         This is some thing new, which I learned.
with best regards,
Sudheer


 
***************************************************************
Sudheer Joseph 
Indian National Centre for Ocean Information Services
Ministry of Earth Sciences, Govt. of India
POST BOX NO: 21, IDA Jeedeemetla P.O.
Via Pragathi Nagar,Kukatpally, Hyderabad; Pin:5000 55
Tel:+91-40-23886047(O),Fax:+91-40-23895011(O),
Tel:+91-40-23044600(R),Tel:+91-40-9440832534(Mobile)
E-mail:sjo.India< at >gmail.com;sudheer.joseph-/E1597aS9LQAvxtiuMwx3w< at >public.gmane.org
Web- http://oppamthadathil.tripod.com
***************************************************************


This SF.net email is sponsored by Windows:

Build for Windows Store.

http://p.sf.net/sfu/windows-dev2dev_______________________________________________
Matplotlib-users mailing list
Matplotlib-users-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f< at >public.gmane.org
https://lists.sourceforge.net/lists/listinfo/matplotlib-users

Rasterize FancyArrowPatch etc.?

Michael McNeil Forbes — 2013-06-14T20:24:38

I am trying to rasterize the fancy arrows drawn by the lovely streamplot() function, but am running into major problems since the arrows are drawn at a very late stage (to preserve their aspect ratio).

--------------
from pylab import *
fig = figure(figsize=(10,5))
x = linspace(-1,1,10)[:, None]
x = linspace(-1,1,10)[:, None]
y = x.T

# Why don't the first two work... it is annoying.  Is it a "bug" or a feature?
#s = streamplot(x, y, x+0*y, y+0*x)
#s = streamplot(x.flat, y.flat, x+0*y, y+0*x)
s = streamplot(x.ravel(), y.ravel(), x+0*y, y+0*x,
               density=0.5, arrowstyle='->', arrowsize=2.0)

setp(s.lines, rasterized=True)  # This works fine.
setp(s.arrows, rasterized=True) # This has no effect (bug?)
setp(s.arrows, visible=False)   # This also has no effect (bug?)

# Let's get the patches instead
ax = gca()
#setp(ax.patches, rasterized=True)  # The FancyArrowPatchs are here

# This does not rasterize the arrows, giving multiple warnings:
#    UserWarning: Rasterization of 'FancyArrowPatch(...)' w

Re: full grid for 2nd y-axis wit twinx() ?

Daniel Mader — 2013-06-14T17:56:27

ah, should have been:
ax1.grid()
ax2.grid()
ax1.yaxis.grid(False)
------------------------------------------------------------------------------
This SF.net email is sponsored by Windows:

Build for Windows Store.

http://p.sf.net/sfu/windows-dev2dev_______________________________________________
Matplotlib-users mailing list
Matplotlib-users-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f< at >public.gmane.org
https://lists.sourceforge.net/lists/listinfo/matplotlib-users

Re: full grid for 2nd y-axis wit twinx() ?

Daniel Mader — 2013-06-14T17:51:22

Hi Paul,

thanks for your efforts, I've figured it out by myself by now, with you
pieces of code:

ax1.grid()
ax2.grid()
ax1.xaxis.grid(False)

does the trick :)
------------------------------------------------------------------------------
This SF.net email is sponsored by Windows:

Build for Windows Store.

http://p.sf.net/sfu/windows-dev2dev_______________________________________________
Matplotlib-users mailing list
Matplotlib-users-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f< at >public.gmane.org
https://lists.sourceforge.net/lists/listinfo/matplotlib-users

Re: full grid for 2nd y-axis wit twinx() ?

Paul Hobson — 2013-06-14T15:55:54

On Thu, Jun 13, 2013 at 1:33 PM, Daniel Mader <
danielstefanmader-gM/Ye1E23mwN+BqQ9rBEUg< at >public.gmane.org> wrote:

Try throwing this in there:

ax1.xaxis.grid(False, which='both')

ax1.yaxis.grid(False, which='both')
------------------------------------------------------------------------------
This SF.net email is sponsored by Windows:

Build for Windows Store.

http://p.sf.net/sfu/windows-dev2dev_______________________________________________
Matplotlib-users mailing list
Matplotlib-users-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f< at >public.gmane.org
https://lists.sourceforge.net/lists/listinfo/matplotlib-users

Re: savefig

Paul Hobson — 2013-06-14T15:35:51

On Thu, Jun 13, 2013 at 11:40 PM, Sudheer Joseph
<sudheer.joseph-/E1597aS9LQAvxtiuMwx3w< at >public.gmane.org>wrote:


In the qtconsole, you can enter multi-line mode with crtl+enter.
------------------------------------------------------------------------------
This SF.net email is sponsored by Windows:

Build for Windows Store.

http://p.sf.net/sfu/windows-dev2dev_______________________________________________
Matplotlib-users mailing list
Matplotlib-users-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f< at >public.gmane.org
https://lists.sourceforge.net/lists/listinfo/matplotlib-users

Re: savefig

Sudheer Joseph — 2013-06-14T06:40:44

Thank you,
I don&#x27;t see a way other than starting in normal mode as the moment I type plot command it get displayed and I don&#x27;t need to do a show command. 
With best regards sudheer------------------------------------------------------------------------------
This SF.net email is sponsored by Windows:

Build for Windows Store.

http://p.sf.net/sfu/windows-dev2dev_______________________________________________
Matplotlib-users mailing list
Matplotlib-users-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f< at >public.gmane.org
https://lists.sourceforge.net/lists/listinfo/matplotlib-users

Re: savefig

Sudheer Joseph — 2013-06-14T01:33:28

Thank you Roban,
                     Your that trick worked,
if I keep ts.plot(), savefig('ts.pdf') both on same line it works!

with best regards
Sudheer

 ***************************************************************
Sudheer Joseph 
Indian National Centre for Ocean Information Services
Ministry of Earth Sciences, Govt. of India
POST BOX NO: 21, IDA Jeedeemetla P.O.
Via Pragathi Nagar,Kukatpally, Hyderabad; Pin:5000 55
Tel:+91-40-23886047(O),Fax:+91-40-23895011(O),
Tel:+91-40-23044600(R),Tel:+91-40-9440832534(Mobile)
E-mail:sjo.India-Re5JQEeQqe8AvxtiuMwx3w< at >public.gmane.org;sudheer.joseph-/E1597aS9LQAvxtiuMwx3w< at >public.gmane.org
Web- http://oppamthadathil.tripod.com
***************************************************************



------------------------------------------------------------------------------
This SF.net email is sponsored by Windows:

Build for Windows Store.

http://p.sf.net/sfu/windows-dev2dev

Single colorbar for two overlaid contourf plots

zetah — 2013-06-13T21:09:05

Hi,

in this example:

========================================
import numpy as np
import matplotlib.pyplot as plt

arr = np.random.random((10, 10))

plt.contourf(arr, 10)
plt.contourf(arr, 10, cmap='coolwarm', levels=np.arange(0, 1, .2), alpha=.5)
plt.colorbar()
plt.show()
========================================

colorbar is representing last contour. 

I want to make colorbar that will match actual plot, which is combination of two contours obviously. I tried also something like:

========================================
import numpy as np
import matplotlib.pyplot as plt

arr = np.random.random((10, 10))

fig = plt.figure()
ax = fig.add_subplot(111)

cax = ax.contourf(arr, 10)
cb = fig.colorbar(cax)
cax = ax.contourf(arr, 10, cmap='coolwarm', levels=np.arange(0, 1, .2), alpha=.5)
cb.update_bruteforce(cax)    # tried also: cb.update_normal(cax)

plt.show()
========================================

but it didn't get me there. Is there some easy way to do this?

Thanks


-------------------------------------

Re: full grid for 2nd y-axis wit twinx() ?

Daniel Mader — 2013-06-13T20:33:39

Hi Paul,

I've modified your suggestion a little, since I don't want a grid for the
primary axis at all -- unfortunately to no avail, i.e. no grid line at all:

import numpy

import matplotlib

matplotlib.use('agg')

import matplotlib.pyplot as plt


datax = numpy.arange(50)

data1 = numpy.sin(datax)*1.5

data2 = datax**2


plt.close('all')


fig = plt.figure()

ax1 = fig.add_subplot(111)

ax2 = ax1.twinx()


ax1.plot(datax, data1, 'x')

ax2.plot(datax, data2, '--')


#for ax in [ax1, ax2]:

# ax.xaxis.grid(True, which='both') # `which` can be 'minor', 'major', or
'both'

# ax.yaxis.grid(True, which='both')


ax2.xaxis.grid(True, which='both')

ax2.yaxis.grid(True, which='both')


fig.savefig('twinxgrid.png')

#fig.show()
------------------------------------------------------------------------------
This SF.net email is sponsored by Windows:

Build for Windows Store.

http://p.sf.net/sfu/windows-dev2dev_______________________________________________
Matplotlib-users mailing list
Matplotlib-users-5NWGOfrQmneR

Re: full grid for 2nd y-axis wit twinx() ?

Paul Hobson — 2013-06-13T19:42:33

On Thu, Jun 13, 2013 at 4:47 AM, Daniel Mader <
danielstefanmader-gM/Ye1E23mwN+BqQ9rBEUg< at >public.gmane.org> wrote:


Does this get you where you want to be?

import pylab

datax = pylab.arange(50)
data1 = pylab.sin(datax)*1.5
data2 = datax**2

pylab.close('all')

fig = pylab.figure()
ax1 = fig.add_subplot(111)
ax2 = ax1.twinx()

ax1.plot(datax, data1, 'x')
ax2.plot(datax, data2, '--')

for ax in [ax1, ax2]:
    ax.xaxis.grid(True, which='both') # `which` can be 'minor', 'major', or
'both'
    ax.yaxis.grid(True, which='both')

fig.show()
------------------------------------------------------------------------------
This SF.net email is sponsored by Windows:

Build for Windows Store.

http://p.sf.net/sfu/windows-dev2dev_______________________________________________
Matplotlib-users mailing list
Matplotlib-users-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f< at >public.gmane.org
https://lists.sourceforge.net/lists/listinfo/matplotlib-users

Re: savefig

Matthias BUSSONNIER — 2013-06-13T15:31:16

close_figures,  not close_all

Haven't tried to switch it at run time using %config magic though.

$ ipython [qtconsole|notebook|whatever] --help-all 

to get all option as examples in config files are **not** updated with IPython.

InlineBackend options
---------------------
--InlineBackend.close_figures=<CBool>
    Default: True
    Close all figures at the end of each cell.
    When True, ensures that each cell starts with no active figures, but it also
    means that one must keep track of references in order to edit or redraw
    figures in subsequent cells. This mode is ideal for the notebook, where
    residual plots from other cells might be surprising.
    When False, one must call figure() to create new figures. This means that
    gcf() and getfigs() can reference figures created in other cells, and the
    active figure can continue to be edited with pylab/pyplot methods that
    reference the current active figure. This mode facilitates iterative editing
    of figures, and behaves most consiste

Re: savefig

Roban Kramer — 2013-06-13T14:42:11

savefig works for me when I put both the plotting commands and the savefig
call in the *same* code cell.


On Thu, Jun 13, 2013 at 10:31 AM, Sudheer Joseph
<sudheer.joseph-/E1597aS9LQAvxtiuMwx3w< at >public.gmane.org>wrote:

------------------------------------------------------------------------------
This SF.net email is sponsored by Windows:

Build for Windows Store.

http://p.sf.net/sfu/windows-dev2dev_______________________________________________
Matplotlib-users mailing list
Matplotlib-users-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f< at >public.gmane.org
https://lists.sourceforge.net/lists/listinfo/matplotlib-users

Re: multiple overlaid contour plots

Francesco Montesano — 2013-06-13T14:38:38

Dear Lado,

You should be able to do it simply by calling countourf multiple times
changing the alpha value (or setting it to something like 0.5)

    plt.contourf(..., alpha=0.8, ...)
    plt.contourf(..., alpha=0.6, ...)
    plt.contourf(..., alpha=0.4, ...)

The problem comes when you want to save the figure as eps: it does not
support transparency, so the alpha level is ignored and all colors are
solid.

Cheers,

Francesco




2013/6/13 Lado Samushia <colkhis-Re5JQEeQqe8AvxtiuMwx3w< at >public.gmane.org>

------------------------------------------------------------------------------
This SF.net email is sponsored by Windows:

Build for Windows Store.

http://p.sf.net/sfu/windows-dev2dev_______________________________________________
Matplotlib-users mailing list
Matplotlib-users-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f< at >public.gmane.org
https://lists.sourceforge.net/lists/listinfo/matplotlib-users

Re: savefig

Sudheer Joseph — 2013-06-13T14:31:14

Thank you,
I don&#x27;t see a way other than starting in normal mode as the moment I type plot command it get displayed and I don&#x27;t need to do a show command. 
With best regards sudheer------------------------------------------------------------------------------
This SF.net email is sponsored by Windows:

Build for Windows Store.

http://p.sf.net/sfu/windows-dev2dev_______________________________________________
Matplotlib-users mailing list
Matplotlib-users-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f< at >public.gmane.org
https://lists.sourceforge.net/lists/listinfo/matplotlib-users

multiple overlaid contour plots

Lado Samushia — 2013-06-13T14:30:29

How can I plot multiple overlaid transparent contour plots in matplotlib?
The link below has a plot that shows I am trying to achieve.
https://docs.google.com/file/d/0B4HYv5Dbtu1Zb1VtOG9PTkJCeVU/edit?usp=sharing

------------------------------------------------------------------------------
This SF.net email is sponsored by Windows:

Build for Windows Store.

http://p.sf.net/sfu/windows-dev2dev

Re: savefig

Paul Hobson — 2013-06-13T14:23:05

On Wed, Jun 12, 2013 at 10:28 PM, Sudheer Joseph
<sudheer.joseph-/E1597aS9LQAvxtiuMwx3w< at >public.gmane.org>wrote:


The fig is destroyed after it has been displayed by the console. Try saving
it before it gets shown.
-p
------------------------------------------------------------------------------
This SF.net email is sponsored by Windows:

Build for Windows Store.

http://p.sf.net/sfu/windows-dev2dev_______________________________________________
Matplotlib-users mailing list
Matplotlib-users-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f< at >public.gmane.org
https://lists.sourceforge.net/lists/listinfo/matplotlib-users

full grid for 2nd y-axis wit twinx() ?

Daniel Mader — 2013-06-13T11:47:36

Hi,

I need a twinx() plot with horizontal and vertical grid lines for the
second axis, just like the usual grid for the first axis. I don't need or
want to specify the ticks manually, though!

My example code just produces horizontal lines:

import pylab


datax = pylab.arange(50)

data1 = pylab.sin(datax)*1.5

data2 = datax**2


pylab.close('all')


fig = pylab.figure()

ax1 = fig.add_subplot(111)

ax2 = ax1.twinx()


ax1.plot(datax, data1, 'x')

ax2.plot(datax, data2, '--')


#ax1.grid()

ax2.grid()


fig.show()


Thanks in advance!
------------------------------------------------------------------------------
This SF.net email is sponsored by Windows:

Build for Windows Store.

http://p.sf.net/sfu/windows-dev2dev_______________________________________________
Matplotlib-users mailing list
Matplotlib-users-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f< at >public.gmane.org
https://lists.sourceforge.net/lists/listinfo/matplotlib-users

savefig

Sudheer Joseph — 2013-06-13T05:28:00

Dear experts,
I start ipython in ipython qtconsole --pylab=inline mode and make a plot. But if I use savefig('fig.png') the figure do not get saved instead I get a blank page.

 I also tried img.save('fig.png',png) but no use. Is there a way out or I need to do this after quitting and restarting in normal mode each time I want to save?

ipython qtconsole --pylab=inline
 

In [93]: ts.plot()
Out[93]: <matplotlib.axes.AxesSubplot at 0x9135490>

***************************************************************
Sudheer Joseph 
Indian National Centre for Ocean Information Services
Ministry of Earth Sciences, Govt. of India
POST BOX NO: 21, IDA Jeedeemetla P.O.
Via Pragathi Nagar,Kukatpally, Hyderabad; Pin:5000 55
Tel:+91-40-23886047(O),Fax:+91-40-23895011(O),
Tel:+91-40-23044600(R),Tel:+91-40-9440832534(Mobile)
E-mail:sjo.India-Re5JQEeQqe8AvxtiuMwx3w< at >public.gmane.org;sudheer.joseph-/E1597aS9LQAvxtiuMwx3w< at >public.gmane.org
Web- http://oppamthadathil.tripod.com
********************************************************

Using a picture as a legend label

Michael Cracraft — 2013-06-12T13:21:21

A typical plot for me includes some simple line curves and a legend
attempting to describe what apparatus that curve belongs to.  Often the
labels I give seem clear to me at the time, but even returning a month
later to the plot, I'll be as lost as the next guy.

A few of my colleagues have been plotting curves, and then including a
picture or diagram in place of a typical legend label.  The picture or
diagram is bordered by the color of the trace on the plot.  I am fairly
certain the plots are done in Matlab.  The diagrams are simply dropped into
a powerpoint deck and given a border that is matched as close as possible
to the trace.  I did some things like that back in graduate school.

Seems like it would be neat to have a way to do a legend in matplotlib that
does something like this.  I'm envisioning a regular axes with lines,
scatter plots, etc. to the left and a column of graphics to the right.  I
would think this would be fairly doable using GridSpec or some of the
similar layout.  The place I could s