Pascha, The people who have been responding are trying to help you understand the "j way" to get your problem addressed. In other words, they have been showing you how to solve the problem using "loop less" J sentences.
In order for you to really understand these helpful suggestions, you have to understand how iteration of verbs across an array dimension is implicit in the language. However, j is certainly capable of iterating manually over data; just use a control structure as described in the lhttp below: http://www.jsoftware.com/docs/help701/jforc/control_structures.htm#_Toc191734474 Sent from my iPhone On Sep 10, 2012, at 4:41 PM, pascha <amirpasha...@gmail.com> wrote: > > could I put it into simple form: > > I'd like to write a verb that reads and process "each" row of a table (50 x > 8) with the condition that this verb calls for two other verbs (read and > write) which they need a specific path. The problem is that how can I read > this table row by row and number the path's "filenames" based on the > row_number that is processing? > > process=: : 0 > input=: read '/home/user/input/filename', row_number ,'.pgm' > > **some calculations** > > output=: write '/home/user/output/filename', row_number ,'.pgm' > ) > > > > Ric Sherlock wrote: >> >> I'm struggling to understand exactly what you are trying to achieve >> but am assuming it just involves processing a set of files. If so then >> something like this might work. >> >> Create a 2 column table of outfilenames ,. infilenames. It doesn't >> really matter how you do this but for clarity here's an example: >> outpath=: 'path/out/' >> inpath=: 'path/in/' >> outfiles=: ((outpath,'outfile') , ,&'.txt') each 8!:0 ] i.3 >> infiles=: ((inpath,'infile') , ,&'.png') each 8!:0 ] i.3 >> outfiles,.infiles >> ┌─────────────────────┬───────────────────┐ >> │path/out/outfile0.txt│path/in/infile0.png│ >> ├─────────────────────┼───────────────────┤ >> │path/out/outfile1.txt│path/in/infile1.png│ >> ├─────────────────────┼───────────────────┤ >> │path/out/outfile2.txt│path/in/infile2.png│ >> └─────────────────────┴───────────────────┘ >> >> Then you want to process each row of this table. The verb processData >> is a placeholder for whatever processing you need to do to take the >> contents of the infile and produce the contents for the outfile. >> >> (fwrite~ processData@fread)/"1 outfiles,.infiles >> >> This is essentially doing the equivalent of the following for each >> pair of out and in files: >> >> 'out/path/outfile1.txt' (fwrite~ processData@fread) >> 'in/path/infile1.png' >> >> HTH >> >> > -- > View this message in context: > http://old.nabble.com/path-variable-in-loop-tp34413608s24193p34415893.html > Sent from the J Programming mailing list archive at Nabble.com. > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
