Read a text file with varying number of colums

2015 1 11
2 个回答
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更新时间：2015 1 12
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I am trying to read a text file with varying number of columns, such as this:
#5:v3.0_ST:1:2631.1301,N:140.0:081.000:12.5;
#5:v3.0_ST:1:2631.1301,N:111.4:100.000:12.5:18.7:32.3;
#5:v3.0_ST:1:2631.1299,N:111.5:101.000:12.5:18.7:32.3;
#5:v3.0_ST:1:2631.1315,N:136.4:082.000:12.3;
#5:v3.0_ST:1:2631.1334,N:132.8:083.000:12.4;
The data is delimited by " : " (colon). I understand, there is some way of doing this using textscan, but I do not know how to do it for varying columns. Can someone give me a hint?
Thanks

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dpb
dpb 2015-1-11
HINT:
doc fgetl
Your file has no clues in it for how many items there are per line other than counting delimiters on a line-by-line basis, unfortunately. Hence, that's the only way...
Pankaj
Pankaj 2015-1-12
ohh, the comma is for separating coordinate notation(N for North), longitude coordinates were also there. I reduced it to simplified form.
Pankaj
Pankaj 2015-1-12
Thank you all for giving your time for this question.

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per isakson
per isakson 2015-1-12
编辑：per isakson 2015-1-12

2 个投票

Try
fid = fopen( 'cssm.txt' );
cac = textscan( fid, '%s%s%s%s%s%s%s%s%s', 'CollectOutput' ...
, true, 'Delimiter', ':;' );
[~] = fclose( fid );
it returns with R2013a
>> cac{:}
ans =
Columns 1 through 8
'#5' 'v3.0_ST' '1' '2631.1301,N' '140.0' '081.000' '12.5' ''
'#5' 'v3.0_ST' '1' '2631.1301,N' '111.4' '100.000' '12.5' '18.7'
'#5' 'v3.0_ST' '1' '2631.1299,N' '111.5' '101.000' '12.5' '18.7'
'#5' 'v3.0_ST' '1' '2631.1315,N' '136.4' '082.000' '12.3' ''
'#5' 'v3.0_ST' '1' '2631.1334,N' '132.8' '083.000' '12.4' []
Column 9
''
'32.3'
'32.3'
''
[]
>>
&nbsp
Comments:
  • importdata reads and parses this file in R2013a too. However, textscan is significantly faster.
  • the empty, "[]", at the right bottom corner must be handled separately
  • the format string should be modified to account for the numberical columns
  • I don't think textscan would have behaved this nice some years ago.
&nbsp
Addendum
This might better match what you look for
fid = fopen( 'cssm.txt' );
cac = textscan( fid, '%s%s%f%f%s%f%f%f%f%f' ...
, 'CollectOutput' , true ...
, 'Delimiter' , ':;,' );
[~] = fclose( fid );
Output:
>> cac{:}
ans =
'#5' 'v3.0_ST'
'#5' 'v3.0_ST'
'#5' 'v3.0_ST'
'#5' 'v3.0_ST'
'#5' 'v3.0_ST'
ans =
1.0e+03 *
0.0010 2.6311
0.0010 2.6311
0.0010 2.6311
0.0010 2.6311
0.0010 2.6311
ans =
'N'
'N'
'N'
'N'
'N'
ans =
140.0000 81.0000 12.5000 NaN NaN
111.4000 100.0000 12.5000 18.7000 32.3000
111.5000 101.0000 12.5000 18.7000 32.3000
136.4000 82.0000 12.3000 NaN NaN
132.8000 83.0000 12.4000 NaN NaN
>>

更多回答（1 个）

Aditya Dua
Aditya Dua 2015-1-11

0 个投票

I tried this on the file segment you posted and it worked:
inp = importdata('file.txt'); where inp(k) contains the k^th line of the text file.
I'm using MATLAB R2014b
Aditya

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