[Tutor] Comparing files, Counting Value
mlaberge at labergedaylight.com
Tue Feb 1 00:27:24 CET 2005
I'm very new to Python and have been trying to write a script to
compare data from 2 files and getting a total. One of the two files
contains x, y positions of pixels and a color value(z) of each, so it
has three columns in the file. The other file has two columns; x1, y1.
I'd like to get only x, y positions which match to x1, y1 of the second
file and then look up the z value. If the z value is greater than a
certain number, it counts 1, otherwise it moves on the next x, y
position. Finally, I'm able to get total count of the pixels that are
over the threshold. The script I'm using is below step by step,
however, I haven't been able to figure out the error massage
"IndexError: list index out of range" on z value. Any comments would be
file 1: file 2:
299 189 8.543e-02 260 168
300 189 0.000e+00 270 180
301 189 0.000e+00 299 189
302 189 0.000e+00 300 170
0 188 5.095e-02 301 189
1 188 5.108e-02 . .
. . . . .
. . . . .
i=open("file 1") #value data
o=open("file 2") #look-up file
x1=fields[0, 1] in i #x,y position in file 1
z=fields in i #value data in file 1
x2=fields[0, 1] in o #x,y position in file 2
if x1 == x2:
if z >= 5.000e-02:
More information about the Tutor