Is it possible to plot data imported from an ASCII file.
Suppose that you have a file '/tmp/DataFile' containing the following text
3;2
2;1
1;0.1
0.01;-0.9Then you can load the two data columns into two arrays xArr and yArr by the following code
f = open('/home/tobi/tmp/DataFile', 'r')
xArr=[]
yArr=[]
line=f.readline()
while(line !=''):
xy=line.split(';')
xArr.append(float(xy[0]))
yArr.append(float(xy[1]))
line=f.readline()Now you can do whatever you want with these array, for example plot them
list_plot(zip(xArr,yArr))If you like to understand better what open and readline does look at Python doc input output, the split command is explained in the Python doc on strings
Does this work on a Windows system or only Linux? I tried to upload a .txt file using a Windows computer and the file could not be found.
You can also use Python's csv module. If your data is in a .csv file and you have uploaded it to the notebook, you can do something like:
import csv
data =list( csv.reader(open(DATA+'DataFile.csv','rU')) )
data = map(lambda x: [float(x[0]),float(x[1])],data)
list_plot(data)Asked: 12 years ago
Seen: 6,411 times
Last updated: Oct 05 '12
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