If I had awk, I would use it to solve this problem. Assume I don't.
Here is a test file:
file =: 0 : 0
1 ; 3
4 ; 5
)
In J, I would write:
addcols12 =: [: +/"1 [: ".@> 2 {."1 ';'&(<;._1@,);._2
testing:
addcols12 file
4 9
If I were a (very precocious!) beginner, I would write
NB. y is a file with LF termination for lines, and ';' as
NB. field separator
NB. Add first 2 fields of each line
addcols12 =: 3 : 0
NB. split on lines
lines =. <;._2 y
NB. split on ;
linedelim =. ';' <;._1@,&.> lines
NB. Take first two fields of each line
linefields12 =. 2 {.&> linedelim
NB. Convert to numeric and add em up
+/"1 ".@> linefields12
)
testing:
addcols12 file
4 9
On 2/14/2014 9:51 PM, Lee Fallat wrote:
Hey there,
As new user to J (but several years experience with C and Java), I
find it very, very interesting. The power of its one liners and
mathematical heritage really have me hooked. I was wondering though
if it has similar capabilities as awk. What's the equivalent to this
awk script in J?:
BEGIN { FS=";" }
{ print $1+$2 }
This script sets a FieldSeparator to ;, and then for every "row", add
the first and second column and prints it. I would like to replace awk
with J!
Thank you,
Lee
P.S. Excuse me if I've misidentified J sentences. (Sentences -> statements?)
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