column-map ( matrix quot: ( ... col -- ... col' ) -- matrix' ) (original) (raw)
column-map ( matrix quot: ( ... col -- ... col' ) -- matrix' )
Matrix operations
| Prev: | matrix-map ( matrix quot: ( ... elt -- ... elt' ) -- matrix' ) |
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| Next: | stitch ( m -- m' ) |
Inputs
| matrix | a matrix |
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| quot | a quotation with stack effect ( ... col -- ... col' ) |
Outputs
| matrix' | a sequence, a matrix, or f |
|---|
Word description
Apply the quotation to every column of the matrix. The output of the quotation must be a sequence.
Notes
| • | This word is intended for use with "flat" (2-dimensional) matrices. |
|---|---|
| • | This word is the transpose variant of map. |
Examples
USING: sequences math.matrices prettyprint ; 3 [ reverse ] column-map .
{ { 0 0 1 } { 0 1 0 } { 1 0 0 } }
Definition
: column-map
( matrix quot: ( ... col -- ... col' ) -- matrix' )
[ transpose ] dip map transpose ; inline