Re: [Matplotlib-users] backend_qt4agg

Ryan,
I used the first line of your example and this was the result:
Traceback (most recent call last):
   File "<input>", line 1, in <module>
   File "C:/OSGEO4~1/apps/qgis/./python\qgis\utils.py", line 454, in _import
     mod = _builtin_import(name, globals, locals, fromlist, level)
ImportError: No module named matplotlib.pyplot

I'm not sure what the first command is to confirm whether a module is 
installed or not, but it looks like I may need that.
Thanks, Ben and Ryan.

John

On 2/12/2015 10:09 AM, Ryan Nelson wrote:
> John,
>
> As Ben said, the QGIS Windows installer comes with its own Python 
> installation, which doesn't know anything about any other Python 
> install. Unfortunately, this apparently makes it rather difficult to 
> install other packages. However, QGIS Python already contains Numpy 
> and Matplotlib and PyQt4, which is what you need here. From the 
> Plugins dropdown menu, select Python Console. In the console that 
> opens at the bottom of the screen, you should be able to type (don't 
> type the > characters):
> >>> import matplotlib.pyplot as plt
> >>> plt.plot([1,2,3])
> >>> plt.show()
>
> On my install of QGIS, that opens a pop-up window with a plot of those 
> data points. Does this throw an error for you too?
>
> Ryan
>
> On Thu, Feb 12, 2015 at 10:35 AM, john polo <jp...@ma... 
> <mailto:jp...@ma...>> wrote:
>
>     Users,
>     I am working on Windows 7 with QGIS 2.4. I am trying to get a plugin
>     installed in QGIS called Semi-Automatic Classification Plugin to work.
>     The plugin is demonstrated here:
>     http://fromgistors.blogspot.com/2013/07/working-with-multispectral-bands-in-qgis.html
>
>     The first time I tried to install the QGIS plugin, I got an error
>     message that backend_qt4agg was not installed. I installed Python(x,y)
>     with Python 2.x, because it seemed like the easiest way to get
>     matplotlib and a bunch of other apps/extensions installed at the same
>     time with minimal effort. I am not a programmer and I'm not familiar
>     with installing things from source and then configuring settings.
>     After
>     the Python(x,y) install, I went to QGIS and started again and tried to
>     install the plugin. I got the same error message. Please tell me
>     what I
>     need to do to get this backend installed in order to get the QGIS
>     plugin
>     I want.
>
>     John Polo
>
>
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