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One more question:
For a file with a header (about 50 lines) and the rest is numeric data (maybe a thousand lines), how to read only the first 50 lines (header), or the last 950 (data) in order to process it?
I meant how to read external files (estructured data) with the data to be used in a J program, and how to write the results to a file.
By the way, that's very good you'll have a better article about J.
Could you comment about how to handling files in J?
(There is a lot of information about sintax, verbs, and so on,
but precious little about files).
Thanks in advance