hi all,
i installed matplotlib, numpy and scipy. i tried to run attached script to
learn how it plot a grph but got error as below:
Traceback (most recent call last):
File "C:\Python25\myscript\plot\plot1.py", line 3, in <module>
from scipy import *
File "C:\Python25\Lib\site-packages\scipy\linalg\__init__.py", line 31, in
<module>
from numpy.testing import NumpyTest
ImportError: cannot import name NumpyTest
pls advise.
thanks
From: waynejwer...@gmail.com
Date: Tue, 18 Jan 2011 06:14:07 -0600
Subject: Re: [Tutor] How to plot graph?
To: tc...@hotmail.com
CC: tutor@python.org
On Tue, Jan 18, 2011 at 4:30 AM, tee chwee liong <tc...@hotmail.com> wrote:
hi all,
i'm new to python and this is advanced for me. is there a way to plot data with
python? i want to plot EyVt, EyHt on the Y-axis and Lane on the X-axis as
attached or below.
currently i'm using Python2.5 and Win XP. thanks a lot.
Take a look at the matplotlib library: http://matplotlib.sourceforge.net/
Especially the gallery page - there are several examples of what you can do. It
may not be the easiest thing to start into as a beginner, but it's definitely
available.
If you're interested in doing a lot of scientific stuff, I'd also recommend
using Python(X, Y): http://www.pythonxy.com/ as it bundles most of the tools
you'll need (such as matplotlib) into one easy installer.
Give it a try and if you get stuck, send us another email with what you've
done, what you expect it to do, and what it actually does instead (including
the full text of any and all tracebacks).
HTH,
Wayne
import numpy as np
from numpy import cos
from scipy import *
from pylab import plot, show, ylim, yticks
from matplotlib import *
from pprint import pprint
n1 = 1.0
n2 = 1.5
#alpha, beta, intensity
data = np.array([
[10, 22, 4.3],
[20, 42, 4.2],
[30, 62, 3.6],
[40, 83, 1.3],
[45, 102, 2.8],
[50, 123, 3.0],
[60, 143, 3.2],
[70, 163, 3.8],
])
# Populate arrays
x = np.array([row[0] for row in data])
y1 = np.array([row[1] for row in data])
rhotang1 = n1*cos(data[:,0]) - n2*cos(data[:,1])
rhotang2 = n1*cos(data[:,0]) + n2*cos(data[:,1])
y3 = rhotang1 / rhotang2
plot(x, y1, 'r--', x, y3, 'g--')
show()
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