From a17782ce2ec31709ce30edb3d96fe2f3a9a6ed1f Mon Sep 17 00:00:00 2001 From: Marshall Lochbaum Date: Sat, 24 Jul 2021 22:47:46 -0400 Subject: Documentation on fill elements --- docs/doc/pick.html | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'docs/doc/pick.html') diff --git a/docs/doc/pick.html b/docs/doc/pick.html index 0926b3a0..b0e99195 100644 --- a/docs/doc/pick.html +++ b/docs/doc/pick.html @@ -6,7 +6,7 @@
BQN / main / doc

Pick

Pick (⊑) chooses elements from 𝕩 based on index lists from 𝕨. 𝕨 can be a plain list, or even one number if 𝕩 is a list, in order to get one element from 𝕩. It can also be an array of index lists, or have deeper array structure: each index list will be replaced with the element of 𝕩 at that index, effectively applying to 𝕨 at depth 1.

-

With no 𝕨, monadic ⊑𝕩 takes the first element of 𝕩 in index order, or its fill element if 𝕩 is empty (causing an error if no fill is known).

+

With no 𝕨, monadic ⊑𝕩 takes the first element of 𝕩 in index order, or its fill element if 𝕩 is empty (causing an error if no fill is known).

While sometimes "scatter-point" indexing is necessary, using Pick to select multiple elements from 𝕩 is less array-oriented than Select (⊏), and probably slower. Consider rearranging your data so that you can select along axes instead of picking out elements.

One element

When the left argument is a number, Pick gets an element from a list:

@@ -55,7 +55,7 @@ ⊑ ↕4‿2‿5‿1 ⟨ 0 0 0 0 ⟩ -

If 𝕩 is empty then Pick always results in an error. First never gives an error: instead it returns the fill element for 𝕩.

+

If 𝕩 is empty then Pick always results in an error. First never gives an error: instead it returns the fill element for 𝕩.

↗️
    ⊑ ""
 ' '
     ⊑ ≢π
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