APL - Selective nesting

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Author

Selective nesting

Ric

2004-11-30, 8:55 pm

Let's say I have the following vector of nested strings in APL+WIN

x{<-}'aaa' 'bbb' 'ccc' 'ccc' 'ddd'

I want to nest those that are the same eg.

..…---------------------.
|.…-..…-..…-------..…-.|
||aa||bb||.…-..…-.||dd||
|'--''--'||cc||cc||'--'|
| |'--''--'| |
| '¹-------' |
'¹---------------------'

One option is to use dyadic enclose to nest all of them

(x{iota}x){enclose}x

..…---------------------------.
|.…---..…---..…-------..…---.|
||.…-.||.…-.||.…-..…-.||.…-.||
|||aa||||bb||||cc||cc||||dd|||
||'--'||'--'||'--''--'||'--'||
|'¹---''¹---''¹-------''¹---'|
'¹---------------------------'

And then selectively disclose the ones with shape of one, but that's
got me stumped too! Any pointers?

Thanks.

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