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Old 10-16-2007, 10:10 AM   #1
Registered: Apr 2006
Posts: 49

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Cool [C++] append to each row of a text files

Is it possible to append some data on a text output file appending the data to each row, and without use too much computational I/O ??

Instead of the classical way:

       VARX     VARY      VARZ...
year1  x1        y1        z1
year2  x2        y2        z2
.. I would like to use the much more redeable:

      year1    year2 ..
VARX    x1       x2 ...
VARY    y1       y2 ...
VARZ    z1       z2 ...
where the 1,2 series are wrote on different times.. a sort of a appendByRow() function.. and I would avoid of load the whole file in memory and then printing it line-by-line..

is it possible ??
Old 10-17-2007, 05:36 AM   #2
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To achieve that you will need to read in the entire file append the data to each line before writing it back out again, so no simple solution, compared with appending the new year to the end of the file.
Old 10-18-2007, 08:22 AM   #3
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Is this a one-time task? Do you just have one file to transpose or are you needing to create a program which will maintain this matrix?


c++, file, text

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