Semi-persistent Matrices

7.7

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Semi-persistent Matrices

This package defines matrices using semi-persistent vectors from data/spvector

procedure
(build-matrix rows cols cell-f) → matrix?
  rows : exact-positive-integer?
  cols : exact-positive-integer?
  cell-f : (exact-nonnegative-integer? exact-nonnegative-integer? . -> . any/c)

Constructs a matrix m such that (matrix-ref m ri ci) is (cell-f ri ci).

procedure
(matrix? v) → boolean?
v : any/c

Determines if v is a valid matrix.

procedure
(matrix-rows m) → exact-positive-integer?
m : matrix?

Returns how many rows m has.

procedure
(matrix-cols m) → exact-positive-integer?
m : matrix?

Returns how many cols m has.

procedure
(matrix-valid-ref? m ri ci) → boolean?
  m : matrix?
  ri : exact-nonnegative-integer?
  ci : exact-nonnegative-integer?

Determines if (matrix-ref m ri ci) would error.

procedure
(matrix-ref m ri ci) → any/c
  m : matrix?
  ri : exact-nonnegative-integer?
  ci : exact-nonnegative-integer?

Extracts the value of a cell in the matrix.

procedure
(matrix-set m ri ci v) → matrix?
  m : matrix?
  ri : exact-nonnegative-integer?
  ci : exact-nonnegative-integer?
  v : any/c

Semi-persistently modifies m.

procedure
(matrix-set! m ri ci v) → void
  m : matrix?
  ri : exact-nonnegative-integer?
  ci : exact-nonnegative-integer?
  v : any/c

Destructively modifies m.

procedure
(matrix-fold m row-f cell-f acc) → any/c
  m : matrix?
  row-f : (exact-nonnegative-integer? any/c . -> . any/c)
  cell-f : (exact-nonnegative-integer? exact-nonnegative-integer? any/c any/c . -> . any/c)
  acc : any/c

Like foldr but for matrices. row-f is called with the result of cell-f from the last column in the row. cell-f is called from left to right.

procedure
(display-matrix m) → void
m : matrix?

displays the cells of m with (newline) separating rows.

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