Matrix-exponentiation operator: Difference between revisions
Content added Content deleted
(→{{header|Scheme}}: Fixed scheme implementation) |
(→{{header|Scheme}}: Added some missing functions) |
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| Line 1,905: | Line 1,905: | ||
<lang scheme> |
<lang scheme> |
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(define (even? n) |
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(if (= 0 (remainder n 2)) |
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#t |
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#f)) |
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(define (dec x) |
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(- x 1)) |
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(define (halve x) |
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(/ x 2)) |
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(define (row*col row col) |
(define (row*col row col) |
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(apply + (map * row col))) |
(apply + (map * row col))) |
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| Line 1,918: | Line 1,929: | ||
(define (matrix-expo mat exp) |
(define (matrix-expo mat exp) |
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(cond ((= exp 1) mat) |
(cond ((= exp 1) mat) |
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((even? exp) (square-matrix (matrix-expo mat ( |
((even? exp) (square-matrix (matrix-expo mat (halve exp)))) |
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(else (multiply-matrix mat (matrix-expo mat ( |
(else (multiply-matrix mat (matrix-expo mat (dec exp)))))) |
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</lang> |
</lang> |
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