string - Display number of spaces -


how should display number of words contained in string(vector)? there may multiple spaces between 2 words.

ex: input: ' hello world, how ' should return 5.

to count number of spaces in vector v, write: n←+/v∊' '

but, won't display number of words. anyone?

s←'hello world, how you?' a←s∊'abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz' +/ (a,0)∧~0,a

a vector contains 1-s @ positions letters occur , 0-s elsewhere.

s:   h e l l o   w o r l d ,   h o w   r e   y o u ? a:   1 1 1 1 1 0 1 1 1 1 1 0 0 1 1 1 0 1 1 1 0 1 1 1 0

every initial letter of word correspond 1 preceded 0 (or in initial position). well, if shift sequence right, negate it, , "and" original value of a, can identify word-initial letters:

s:           h e l l o   w o r l d ,   h o w   r e   y o u ? a,0:         1 1 1 1 1 0 1 1 1 1 1 0 0 1 1 1 0 1 1 1 0 1 1 1 0 0 ~0,a:        1 0 0 0 0 0 1 0 0 0 0 0 1 1 0 0 0 1 0 0 0 1 0 0 0 1 (a,0)∧~0,a:  1 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 0

now, counting words easy summation: +/

you can try code interpreter @ http://ngn.github.io/apl/web/index.html#code=s%u2190%27hello%20world%2c%20how%20are%20you%3f%27%0aa%u2190s%u220a%27abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz%27%0a+/%28a%2c0%29%u2227%7e0%2ca or http://tryapl.org


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