Re: [Matplotlib-users] how load data to Image from String?
How use numpy in order to create Image object from string ? . . . size = canvas.get_width_height( ) buffer = canvas.tostring_rgb() img = numpy.empty(size,numpy.uint32) img = numpy.fromstring(buffer,numpy.uint32) img is an array , but I want an Image object (without using PIL ). sa6113 wrote: > > Would you please help me ? > I want to load data to Image (QImage) from String or binary String without > using PIL module . > -- View this message in context: http://www.nabble.com/how-load-data-to-Image-from-String--tp15784115p15822415.html Sent from the matplotlib - users mailing list archive at Nabble.com. - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] Using math text!
Hi all,
When I use;
text(0.6, 0.6, r'$\mathcal{A}\mathrm{sin}(2 \omega t)$', fontsize=20)
I get an error message below;
File "/usr/lib/python2.5/site-packages/matplotlib/mathtext.py", line 616, in
_get_info
raise ValueError('unrecognized symbol "%s"' % sym)
ValueError: unrecognized symbol "\mathr", unrecognized symbol "\mathcal"
When I replace \mathrm with \mbox or \text, the error message I get is
basically the same, only that this time, the last line appears as;
unrecognized symbol "\mbox", unrecognized symbol "\text"
How should I fix this problem?
Many thanks,
JOE.
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[Matplotlib-users] How do I get Missing Modules?
Hi there, When I use; import matplotlib.pyplot as p, I get an error message; ImportError: No module named pyplot. So, how am I supposed to get these missing modules? Please note: I am using Linux (Ubuntu-gusty)! Regards, JOE. - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] basemap scalebar
Michael Hearne wrote:
> Jeff - That would replicate the "simple" scale-bar from GMT. Below is
> my not-complete attempt at replicating the "fancy" scale bar. It
> would need some options for specifying different units (miles,
> nautical miles, etc.) and perhaps some more attention to spacing of
> the text from the scale bar and tick marks...
>
> --Mike
Mike: Very nice! Do you want the scale to show the true distance on
the earth (in which case the labels will vary depending on where the
label is placed), or the distance in map projection coordinates (in
which case the labels are constant)? Or perhaps a lat/lon value could
be given to specify where the scale is true?
-Jeff
>
> from numpy import *
> from matplotlib.toolkits.basemap import Basemap, pyproj
> from pylab import *
> # add drawscale method to Basemap class.
> class Basemap2(Basemap):
>def drawscale(self,lon,lat,length,yoffset=None):
>"""draw a fancy map scale from lon-length/2,lat-yoffset to
>lon-length/2,lat-yoffset, label it with actual distance in km"""
>length = length*1000 #input length is km
>
>#we need 5 sets of x coordinates (in map units)
>#center of scale
>xc,yc = self(lon,lat)
>#left edge of scale
>lon1,lat1 = self(xc-length/2,yc,inverse=True)
>x1,y1 = self(lon1,lat1)
>#quarter scale
>lon2,lat2 = self(xc-length/4,yc,inverse=True)
>x2,y2 = self(lon2,lat2)
>#three quarter scale
>lon3,lat3 = self(xc+length/4,yc,inverse=True)
>x3,y3 = self(lon3,lat3)
>#right edge of scale
>lon4,lat4 = self(xc+length/2,yc,inverse=True)
>x4,y4 = self(lon4,lat4)
>
>if yoffset is None: yoffset = 0.1*length
>
>#plot top line
>ytop = yc+yoffset/2
>ybottom = yc-yoffset/2
>ytick = ybottom - yoffset/2
>ytext = ytick - yoffset/2
>m.plot([x1,x4],[ytop,ytop],color='k')
>#plot bottom line
>m.plot([x1,x4],[ybottom,ybottom],color='k')
>#plot left edge
>m.plot([x1,x1],[ybottom,ytop],color='k')
>#plot right edge
>m.plot([x4,x4],[ybottom,ytop],color='k')
>
>#make a filled black box from left edge to 1/4 way across
>fill([x1,x2,x2,x1,x1],[ytop,ytop,ybottom,ybottom,ytop],'k')
>#make a filled white box from 1/4 way across to 1/2 way across
>fill([x2,xc,xc,x2,x2],[ytop,ytop,ybottom,ybottom,ytop],'w')
>#make a filled white box from 1/2 way across to 3/4 way across
>fill([xc,x3,x3,xc,xc],[ytop,ytop,ybottom,ybottom,ytop],'k')
>#make a filled white box from 3/4 way across to end
>fill([x3,x4,x4,x3,x3],[ytop,ytop,ybottom,ybottom,ytop],'w')
>
>#plot 3 tick marks at left edge, center, and right edge
>m.plot([x1,x1],[ytick,ybottom],color='k')
>m.plot([xc,xc],[ytick,ybottom],color='k')
>m.plot([x4,x4],[ytick,ybottom],color='k')
>
>#label 3 tick marks
>text(x1,ytext,'%d' % (0),\
>horizontalalignment='center',\
>verticalalignment='top',\
>fontsize=9)
>text(xc,ytext,'%d' % (round((length/2)/1000)),\
>horizontalalignment='center',\
>verticalalignment='top',\
>fontsize=9)
>text(x4,ytext,'%d' % (round((length)/1000)),\
>horizontalalignment='center',\
>verticalalignment='top',\
>fontsize=9)
>
>#put units on top
>text(xc,ytop+yoffset/2,'km',\
>horizontalalignment='center',\
>verticalalignment='bottom',\
>fontsize=9)
>
> # setup of basemap ('lcc' = lambert conformal conic).
> # use major and minor sphere radii from WGS84 ellipsoid.
> m =
> Basemap2(llcrnrlon=-145.5,llcrnrlat=1.,urcrnrlon=-2.566,urcrnrlat=46.352,\
> rsphere=(6378137.00,6356752.3142),\
> resolution='l',area_thresh=1000.,projection='lcc',\
> lat_1=50.,lon_0=-107.)
> # draw coastlines and political boundaries.
> m.drawcoastlines()
> m.fillcontinents()
> # draw parallels and meridians.
> # label on left, right and bottom of map.
> m.drawparallels(arange(0.,80,20.),labels=[1,1,0,1])
> m.drawmeridians(arange(10.,360.,30.),labels=[1,1,0,1])
> # draw a line from x1,y to x2,y and label it with distance in km.
> length = 3000 #kilometers
> x1,y1 = 0.25*m.xmax, 0.25*m.ymax
> lon1,lat1 = m(x1,y1,inverse=True)
> m.drawscale(lon1,lat1,length)
> title('a fancy map scale')
> show()
>
>
>
>
> --
> Michael Hearne
> [EMAIL PROTECTED]
> (303) 273-8620
> USGS National Earthquake Information Center
> 1711 Illinois St. Golden CO 80401
> Senior Software Engineer
> Synergetics, Inc.
> --
>
>
--
Jeffrey S. Whitaker Phone : (303)497-6313
NOAA/OAR/CDC R/PSD1FAX : (303)497-6449
325 BroadwayBoulder, CO, USA 80305-3328
-
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Re: [Matplotlib-users] Using math text!
It looks as if you're using 0.90.1. All of these issues are fixed in
0.91.2. If you can upgrade, that's probably your best bet.
Or, if you have all the requirements, you can set "text.usetex" to True
in your matplotlibrc which will use the "real" TeX on your system to
typeset math -- that should support your expression.
Ssebuliba, J, Mnr <[EMAIL PROTECTED]> wrote:
> Hi all,
>
> When I use;
> text(0.6, 0.6, r'$\mathcal{A}\mathrm{sin}(2 \omega t)$', fontsize=20)
>
> I get an error message below;
> File "/usr/lib/python2.5/site-packages/matplotlib/mathtext.py", line 616, in
> _get_info
> raise ValueError('unrecognized symbol "%s"' % sym)
> ValueError: unrecognized symbol "\mathr", unrecognized symbol "\mathcal"
0.90.1 was much less TeX-like in its mathtext support, and therefore
doesn't support \mathrm, \mathcal etc.. You can, however do:
text(0.6, 0.6, r'$\cal{A}\rm{sin}(2 \omega t)$', fontsize=20)
which works for me.
> When I replace \mathrm with \mbox or \text, the error message I get is
> basically the same, only that this time, the last line appears as;
> unrecognized symbol "\mbox", unrecognized symbol "\text"
\mbox and \text aren't supported by the built-in mathtext in any version.
Cheers,
Mike
--
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA
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Re: [Matplotlib-users] How do I get Missing Modules?
Like your last question, I think you're using the current release's documentation (0.91.2) with an old release (probably 0.90.1 or earlier). pyplot did not exist in 0.90.1, but I believe everything that is now in pyplot used to be in pylab, so you could just import that instead. Cheers, Mike Ssebuliba, J, Mnr <[EMAIL PROTECTED]> wrote: > Hi there, > > When I use; > > import matplotlib.pyplot as p, > > I get an error message; > > ImportError: No module named pyplot. So, how am I supposed to get these > missing modules? > > Please note: I am using Linux (Ubuntu-gusty)! > > Regards, > JOE. > > - > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2008. > http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ > ___ > Matplotlib-users mailing list > Matplotlib-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/matplotlib-users -- Michael Droettboom Science Software Branch Operations and Engineering Division Space Telescope Science Institute Operated by AURA for NASA - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] basemap scalebar
Jeff - I think the way GMT does it would be okay - they have a
latitude of true scale, which I usually choose as the center latitude
of the map.
I was thinking we should allow people to choose the "simple" or
"fancy" options. Do you think it will be okay to have the height of
the bar and the text offset be relative to the length of it? I
suppose if the height becomes a problem, people could use the yoffset
keyword...
--Mike
On Mar 4, 2008, at 6:05 AM, Jeff Whitaker wrote:
Michael Hearne wrote:
Jeff - That would replicate the "simple" scale-bar from GMT.
Below is my not-complete attempt at replicating the "fancy" scale
bar. It would need some options for specifying different units
(miles, nautical miles, etc.) and perhaps some more attention to
spacing of the text from the scale bar and tick marks...
--Mike
Mike: Very nice! Do you want the scale to show the true distance
on the earth (in which case the labels will vary depending on where
the label is placed), or the distance in map projection coordinates
(in which case the labels are constant)? Or perhaps a lat/lon
value could be given to specify where the scale is true?
-Jeff
from numpy import *
from matplotlib.toolkits.basemap import Basemap, pyproj
from pylab import *
# add drawscale method to Basemap class.
class Basemap2(Basemap):
def drawscale(self,lon,lat,length,yoffset=None):
"""draw a fancy map scale from lon-length/2,lat-yoffset to
lon-length/2,lat-yoffset, label it with actual distance in
km"""
length = length*1000 #input length is km
#we need 5 sets of x coordinates (in map units)
#center of scale
xc,yc = self(lon,lat)
#left edge of scale
lon1,lat1 = self(xc-length/2,yc,inverse=True)
x1,y1 = self(lon1,lat1)
#quarter scale
lon2,lat2 = self(xc-length/4,yc,inverse=True)
x2,y2 = self(lon2,lat2)
#three quarter scale
lon3,lat3 = self(xc+length/4,yc,inverse=True)
x3,y3 = self(lon3,lat3)
#right edge of scale
lon4,lat4 = self(xc+length/2,yc,inverse=True)
x4,y4 = self(lon4,lat4)
if yoffset is None: yoffset = 0.1*length
#plot top line
ytop = yc+yoffset/2
ybottom = yc-yoffset/2
ytick = ybottom - yoffset/2
ytext = ytick - yoffset/2
m.plot([x1,x4],[ytop,ytop],color='k')
#plot bottom line
m.plot([x1,x4],[ybottom,ybottom],color='k')
#plot left edge
m.plot([x1,x1],[ybottom,ytop],color='k')
#plot right edge
m.plot([x4,x4],[ybottom,ytop],color='k')
#make a filled black box from left edge to 1/4 way across
fill([x1,x2,x2,x1,x1],[ytop,ytop,ybottom,ybottom,ytop],'k')
#make a filled white box from 1/4 way across to 1/2 way across
fill([x2,xc,xc,x2,x2],[ytop,ytop,ybottom,ybottom,ytop],'w')
#make a filled white box from 1/2 way across to 3/4 way across
fill([xc,x3,x3,xc,xc],[ytop,ytop,ybottom,ybottom,ytop],'k')
#make a filled white box from 3/4 way across to end
fill([x3,x4,x4,x3,x3],[ytop,ytop,ybottom,ybottom,ytop],'w')
#plot 3 tick marks at left edge, center, and right edge
m.plot([x1,x1],[ytick,ybottom],color='k')
m.plot([xc,xc],[ytick,ybottom],color='k')
m.plot([x4,x4],[ytick,ybottom],color='k')
#label 3 tick marks
text(x1,ytext,'%d' % (0),\
horizontalalignment='center',\
verticalalignment='top',\
fontsize=9)
text(xc,ytext,'%d' % (round((length/2)/1000)),\
horizontalalignment='center',\
verticalalignment='top',\
fontsize=9)
text(x4,ytext,'%d' % (round((length)/1000)),\
horizontalalignment='center',\
verticalalignment='top',\
fontsize=9)
#put units on top
text(xc,ytop+yoffset/2,'km',\
horizontalalignment='center',\
verticalalignment='bottom',\
fontsize=9)
# setup of basemap ('lcc' = lambert conformal conic).
# use major and minor sphere radii from WGS84 ellipsoid.
m = Basemap2
(llcrnrlon=-145.5,llcrnrlat=1.,urcrnrlon=-2.566,urcrnrlat=46.352,\
rsphere=(6378137.00,6356752.3142),\
resolution='l',area_thresh=1000.,projection='lcc',\
lat_1=50.,lon_0=-107.)
# draw coastlines and political boundaries.
m.drawcoastlines()
m.fillcontinents()
# draw parallels and meridians.
# label on left, right and bottom of map.
m.drawparallels(arange(0.,80,20.),labels=[1,1,0,1])
m.drawmeridians(arange(10.,360.,30.),labels=[1,1,0,1])
# draw a line from x1,y to x2,y and label it with distance in km.
length = 3000 #kilometers
x1,y1 = 0.25*m.xmax, 0.25*m.ymax
lon1,lat1 = m(x1,y1,inverse=True)
m.drawscale(lon1,lat1,length)
title('a fancy map scale')
show()
--
Michael Hearne
[EMAIL PROTECTED]
(303) 273-8620
USGS National Earthquake Information Center
1711 Illinois St. Golden CO 80401
Senior Software Engineer
Synergetics, Inc.
---
[Matplotlib-users] newbie question about interactive plotting
I'm trying to use the pylab interface of matplotlib interactively. I'd like to enter some commands interactively to generate some data, plot a graph based on the data, inspect the graph, enter more interactive python, plot another graph, and so on. Instead, what happens is either (a) If I start with matplotlib set to interactive, control returns to the Idle shell after the graph appears, but my graph window isn't interactive (and most importantly, the window doesn't even refresh properly, so if it is initially covered by the Idle window or another window, that part of the graph isn't visible even when I put the graph window in the foreground, or (b) if I don't start with matplotlib in interactive mode, then to see the graph I need to type show(). Then the graph is interactive and refreshing works right, but the cursor doesn't return to the Idle shell, unless I kill the graph window. At that point, any subsequent calls to show() behave as in case (a). My questions are: 1. Is this the expected behavior? [given the details on my setup and procedure below] 2. Is there a way to get the type of interactivity I described in the first paragraph of my email, other than using ipython (which I don't particularly like because of the DOS window display, and the lack of command completion and function argument hints which I depend on when using GUI python shells like pythonwin or PyCrust)? 3. Is this a fundamental issue with trying to plot using an interactive shell whose main message loop doesn't know anything about the graph window? I suspect the answers are yes, no (except ipython), and yes, but if so, I'd like to have confirmation of that so I don't keep trying to bang my head against a wall trying to figure out what I'm doing wrong. Here are the details on what versions I'm running and what I'm trying: I'm using matplotlib version 0.91.2 with Python 2.4.4 on Windows XP. Following the instructions at http://matplotlib.sourceforge.net/interactive.html, I've set my TkAgg as my default backend and set interactive to True in my matplotlibrc file. I generally like do my interactive python in a shell with autocompletion. On Windows, I generally prefer PythonWin, but am open to exploring others if PythonWin is not going to be compatible with the matplotlib backend. For now, I'm testing with the (Tkinter-based) Idle to avoid possible conflicts between the PythonWin mainloop. I fire up Idle and following the example, type from pylab import * plot([1,2,3]) A new window pops up and displays my graph. However, the toolbar in the window does not respond, and any portion of the window which was covered by my Idle window doesn't get refreshed when I switch to the window. This is not terribly useful. Alternatively, if I don't set interactive in matplotlibrc, I do the same steps and an empty window pops up. If I then type show() the graph appears in that window, and refreshing and the toolbar work fine. I can manipulate the window and its contents with the toolbar. However, the cursor does not return to the Idle window, so I can't plot another graph. The only way I've been able to get the cursor to return to the Idle window is to close the graph window (via the Windows close button). When I do that, I can once again issue python commands interactively, and the behavior again matches the interactive mode (so refresh doesn't work right). - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] how load data to Image from String?
I need QImage in order to display or use in GUI , for exa. in QFrame or QLabel , I can convert the Image to QImage , but the problem is that I haven't access to Image object without saving that , also I can convert the figure (Plot) to string or buffer but I don't know what should I do after that and how convert it to Image. What about numpy or Numerical Python , may I use fromstring or another function ? Or what about savining the string binary or buffer in StringIO and then convert to QImage ? Christopher Barker wrote: > > sa6113 wrote: >> Would you please help me ? >> I want to load data to Image (QImage) from String or binary String >> without >> using PIL module . > > you can load data straight into a numpy array with numpy.fromstring() -- > if it's in an easy format (RGB, RGBA), then you should be able to go > from there. > > What do you want to do with the image data? > > -CHB > > > -- > Christopher Barker, Ph.D. > Oceanographer > > Emergency Response Division > NOAA/NOS/OR&R(206) 526-6959 voice > 7600 Sand Point Way NE (206) 526-6329 fax > Seattle, WA 98115 (206) 526-6317 main reception > > [EMAIL PROTECTED] > > - > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2008. > http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ > ___ > Matplotlib-users mailing list > Matplotlib-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/matplotlib-users > > -- View this message in context: http://www.nabble.com/how-load-data-to-Image-from-String--tp15784115p15843273.html Sent from the matplotlib - users mailing list archive at Nabble.com. - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
