Scan: Difference between revisions
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{{primitive|f\y<br>x f\y}} |
{{primitive|f\y<br>x f\y}} |
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''' |
'''scan''', also known as '''cumulative reduce''' or '''scanl''' takes a dyadic function <code>f</code> and reduces an array <code>y</code> using it, while providing an array of intermediate values. |
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Scan works very similarly to [[fold]]. |
Scan works very similarly to [[fold]]. |
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[[Category:Adverbs]] |
[[Category:Adverbs]] |
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[[Category:Primitives]] |
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Latest revision as of 04:43, 9 July 2022
Scan
f\y
x f\y
x f\y
scan, also known as cumulative reduce or scanl takes a dyadic function f and reduces an array y using it, while providing an array of intermediate values.
Scan works very similarly to fold.
+\1 2 3 4 5
1 3 6 10 15
,\("ab";1;`d`a`b)
("ab"
("a";"b";1)
("a";"b";1;`d;`a;`b))
Specifying a left argument x uses it as an initial value.
3 +\1 2 3 4 4 6 9 13
When used with functions that take more than 2 arguments, scan can take multiple arguments, of which the first one is always the initial value.
{x,y,z}\["A";1 2 3;"BCD"]
(("A";1;"B")
("A";1;"B";2;"C")
("A";1;"B";2;"C";3;"D"))