That's not a good description, but there's more below.
First, thanks so much to those who suggested the box display in
addition to linear. That has helped so much.
Here's what I want:
I want to take a rank 2 array and for each row in it: if the row
contains no zeroes, leave it alone; if the row contains zeroes, then
for each zero replicate the row and replace the instances of that zero
with _1 and 1. This should repeat, so this:
1 _1 0 1
1 1 _1 1
0 1 0 _1
would become this:
1 _1 _1 1
1 _1 1 1
1 1 _1 1
_1 1 _1 _1
_1 1 1 _1
1 1 _1 _1
1 1 1 _1
I've gotten close:
expandZeroes =: (_1 1 (] i.&0)}"0 1 ])[EMAIL PROTECTED](# = i.&0)"1
That produces:
1 _1 _1 1
1 _1 1 1
1 1 _1 1
0 0 0 0
_1 1 0 _1
1 1 0 _1
And, applied twice it works perfectly on the third row. My intent is
to add ^:_ to account for any number of zeroes, but doing that with
the spurious row of zeroes in the above result would be bad...
So two questions:
First, correct me if I'm wrong, but if the output from each input row
was shaped 2 4 instead of 1 2 4 I'd be set. The extra row of zeroes in
the output is just a framing fill, correct? If that's so, how do I
change the shape of the intermediate output?
Second, am I just going about this the wrong way? Is expandZeroes at
all reasonable? Is there a better way?
Thanks,
Geoff
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
