Importing a matrix from a text file

Question

I have a $4 \times N$ matrix in a .txt file of the form:

-17.071 137.567 16.554 0.65

-16.873 136.138 16.934 0.7

-15.397 135.738 16.894 0.7

-14.7 135.982 15.9 0.6

... ($N-4$ additional row entries)

Where the numeric values in each row are separated by a space. How would I read this matrix in, and parse it in the following manner:

{ 
  {-17.071, 137.567, 16.554, 0.65},
  {-16.873, 136.138, 16.934, 0.7},
  {-15.397, 135.738, 16.894, 0.7},
  {-14.7, 135.982, 15.9, 0.6},
  ...
}

Evaluating

Import[PATH\\MATRIX.txt]]

Only returns the printed contents of the file.

Please upload the file somewhere so that we can help you better. — s0rce, Mar 6, 2013 at 22:38
i have a same question my file path is D:\ and my file name is f.txt so how can i import in mathematica? — Hafiz Fahad, Mar 6, 2017 at 13:05
@HafizFahad did you see the accepted answer here? If Import[ filename , "Table" ] doesn't work I'd guess your file is structured differently. — george2079, Mar 6, 2017 at 15:48

s0rce · Accepted Answer · 2013-03-06 22:38:53Z

11

I suspect that

data = Import[PATH\\MATRIX.txt, "Table"]

could work for you, however, I'm not sure without a copy of your file. If you post that I will try to update this answer.

answered Mar 6, 2013 at 22:38

s0rce

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$\begingroup$ Works! ReadList[PATH\\MATRIX.txt, {Number, Number, Number, Number}] also worked. $\endgroup$
– Roger Harris
Mar 6, 2013 at 22:40
1

$\begingroup$ You need a double quota for PATH\\MATRIX.txt $\endgroup$
– James LT
Jul 6, 2016 at 19:31

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