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02-28-2011, 03:49 AM #1
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- Feb 2011
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So I have been trying to use pythonxy to graph some data but have been having trouble getting the script I was given to work. The instructions I was given are as follows
* Now fire up your python shell: ipython -pylab This preloads numpy and matplotlib, but if you're using something else, make sure those two packages are loaded... numpy is a requirement for matplotlib anyway, but the advantage to loading it explicitly is that it makes the next step very easy: % idx, P, Pdot = loadtxt("psrcat-P-Pdot.dat", usecols=(0,2,3), unpack=True) If I didn't have loadtxt from numpy, I'd have to actually manually parse the data file, but that's not hard either. Here's a snippet of code that does something similar: f = open('myfile.txt', 'rU') for line in f: if(line.startswith('#')): print line.strip() else: x, y, z = line.split() But then you still need to load the x,y,z values into an array. Lets say loadtxt works for now. So now you have one-dimensional arrays which contain P and Pdot. Plot them up! % plot( log(P), log(Pdot), 'ro' ) And you're off.
01-29-2012, 04:37 AM #2
- Join Date
- May 2009
- Thanked 1 Time in 1 Post
can you verify that all required modules are being loaded?
Also, when you try this, is it giving you any kind of output?
On the console, what kind of errors is it giving you?
If it does actually display something on the plot window, what is it showing (or just plotting nothing at all)
This is interesting to me, as i am also using pythonxy and moving from MatLab to Python (since Matlab refuses to support ATI GPUs...which are 3x better at integer math than Nvidia GPUs btw)
..i am also a bit new to Python, though not a n00b to programming by a long shot