Cartesian product of two or more lists: Difference between revisions
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=={{header|Common Lisp}}== |
=={{header|Common Lisp}}== |
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<lang lisp>(defun cartesian-product (s1 s2) |
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"Compute the cartesian product of two sets represented as lists" |
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(loop for x in s1 |
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nconc (loop for y in s2 collect (list x y)))) |
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</lang> |
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'''Output''' |
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<lang lisp> |
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CL-USER> (cartesian-product '(1 2) '(3 4)) |
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((1 3) (1 4) (2 3) (2 4)) |
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CL-USER> (cartesian-product '(3 4) '(1 2)) |
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((3 1) (3 2) (4 1) (4 2)) |
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CL-USER> (cartesian-product '(1 2) '()) |
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NIL |
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CL-USER> (cartesian-product '() '(1 2)) |
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NIL |
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</lang> |
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<lang lisp>(defun n-cartesian-product (l) |
<lang lisp>(defun n-cartesian-product (l) |
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"Compute the n-cartesian product of a list of sets represented as list with a mixed recursive-iterative approach. |
"Compute the n-cartesian product of a list of sets represented as list with a mixed recursive-iterative approach. |
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