CSV data manipulation

CSV data manipulation is a draft programming task. It is not yet considered ready to be promoted as a complete task, for reasons that should be found in its talk page.

CSV spreadsheet files are portable ways of storing tabular data. The CSV format is either flexible or ill defined, depending on a point of view, allowing for delimiters besides comma.

The task here is to read a CSV file, change some values and save the changes back to the same file. For this task we will use the following CSV file:

C1,C2,C3,C4,C5

1,5,9,13,17

2,6,10,14,18

3,7,11,15,19

4,8,12,16,20

REXX

<lang rexx>/* REXX ***************************************************************

• extend in.csv to add a column containing the sum of the lines' elems
• 21.06.2013 Walter Pachl
  • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • /

csv='in.csv' Do i=1 By 1 While lines(csv)>0

 l=linein(csv)
 If i=1 Then
   l.i=l',SUM'
 Else Do
   ol=l
   sum=0
   Do While l<>
     Parse Var l e ',' l
     sum=sum+e
     End
   l.i=ol','sum
   End
 End

Call lineout csv 'erase' csv Do i=1 To i-1

 Call lineout csv,l.i
 End

</lang> Output

C1,C2,C3,C4,C5,SUM
1,5,9,13,17,45
2,6,10,14,18,50
3,7,11,15,19,55
4,8,12,16,20,60