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How to write data from a .txt file into an array?

P: 3
Hi, I currently have a .txt file containing xyz coordinates of 10 particles which looks like:


and I want to turn this into an array which is the same shape as the data in the .txt file ie there would be 3 colums representing x,y,z coords and 10 rows representing the 10 particles. Im quite new to python so any help on how to do this would be great
Jan 30 '11 #1
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Expert Mod 2.5K+
P: 2,851
Read the file, parse into a list of lists, type cast to float, initialize new array, iterate on data and add each number to array.

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  1. dataList = [[float(s) for s in item.strip().split(",")] for item in open("numpytest.txt").readlines()]
  2. rows = len(dataList)
  3. cols = len(dataList[0])
  4. arr1 = N.zeros([rows,cols], dtype=N.float64)
  5. for i, row in enumerate(dataList):
  6.     for j, number in enumerate(row):
  7.         arr1[i][j] = number
Jan 30 '11 #2

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