Hi, I’m still working on my interpolating from an irregularly space grid and then running pcolormesh on the resulting output. With some of the newer data I’ve been plotting I’ve noticed that my plots are complete garbage. I realized that this was actually because of the output from griddata rather than some problem with pcolormesh/pcolor/etc (basically I get huge negative values like -80000 from the interpolation when all of my data points lie within [0,20]) .
Googling I found out that the default griddata has some problems, and that there is a better, more robust version available through natgrid. I downloaded the natgrid-0.2.1 package from here http://sourceforge.net/projects/matplotlib/files%2Fmatplotlib-toolkits%2Fnatgrid-0.2/.
My question now is, how do I install this and give it a shot? I’m running on Ubuntu (or Xubuntu rather). The README doesn’t seem to have any directions.
Also, let’s say that this new griddata doesn’t work for me, is there something else I could try? The interpolation problems are strange, because I can break my data into 3 segments (I read 3 files to obtain the data so this is the natural way to do it) and I can plot and interpolate correctly any segment individually. It’s only when I do all 3 segments together that the interpolation begins to fail.
Any ideas?
Thanks for the continued help!
Brad
Hi, I'm still working on my interpolating from an
irregularly space grid and then running pcolormesh on the
resulting output. With some of the newer data I’ve been plotting
I’ve noticed that my plots are complete garbage. I realized that
this was actually because of the output from griddata rather than
some problem with pcolormesh/pcolor/etc (basically I get huge
negative values like -80000 from the interpolation when all of my
data points lie within [0,20]) .
Googling I found out that the default griddata has some
problems, and that there is a better, more robust version
available through natgrid. I downloaded the natgrid-0.2.1
package from here http://sourceforge.net/projects/matplotlib/files%2Fmatplotlib-toolkits%2Fnatgrid-0.2/.
My question now is, how do I install this and give it a shot?
I’m running on Ubuntu (or Xubuntu rather). The README doesn’t
seem to have any directions.
Brad:
python setup.py install should do it. matplotlib will automatically
use it if it’s installed.
-Jeff
···
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Jeff,
Thanks. That indeed did work (after downloading python-dev package). I just didn’t know that ‘install’ was the argument that I was supposed to pass to it =)
After installing I tried griddata again. My input data was originally a list. The new griddata didn’t like this and so I simply used a=array(thelist) to convert to an array and tried again. It took quite a bit longer than the old griddata, but the resulting output now looks correct! Better a slow and correct answer than a fast and garbage one.
Thanks again Jeff (and thanks for the new griddata if you are the one that made it)!
Brad
···
On Wed, Dec 21, 2011 at 5:55 AM, Jeff Whitaker <jswhit@…146…> wrote:
On 12/21/11 12:31 AM, Brad Malone wrote:
Hi, I'm still working on my interpolating from an
irregularly space grid and then running pcolormesh on the
resulting output. With some of the newer data I’ve been plotting
I’ve noticed that my plots are complete garbage. I realized that
this was actually because of the output from griddata rather than
some problem with pcolormesh/pcolor/etc (basically I get huge
negative values like -80000 from the interpolation when all of my
data points lie within [0,20]) .
Googling I found out that the default griddata has some
problems, and that there is a better, more robust version
available through natgrid. I downloaded the natgrid-0.2.1
package from here http://sourceforge.net/projects/matplotlib/files%2Fmatplotlib-toolkits%2Fnatgrid-0.2/.
My question now is, how do I install this and give it a shot?
I’m running on Ubuntu (or Xubuntu rather). The README doesn’t
seem to have any directions.
Brad:
python setup.py install should do it. matplotlib will automatically
use it if it’s installed.
-Jeff
Also, let's say that this new griddata doesn't work for me,
is there something else I could try? The interpolation problems
are strange, because I can break my data into 3 segments (I read
3 files to obtain the data so this is the natural way to do it)
and I can plot and interpolate correctly any segment
individually. It’s only when I do all 3 segments together that
the interpolation begins to fail.
Any ideas?
Thanks for the continued help!
Brad
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