Pythagorean triples: Difference between revisions
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(→{{header|J}}: add whitespace to help with reading) |
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Brute force approach: |
Brute force approach: |
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<lang j>pytr=:3 :0 |
<lang j>pytr=: 3 :0 |
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r=.i.0 3 |
r=. i. 0 3 |
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for_a.1+i.<.(y-1)%3 do. |
for_a. 1 + i. <.(y-1)%3 do. |
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b=.1+a+i.<.(y%2)-3*a%2 |
b=. 1 + a + i. <.(y%2)-3*a%2 |
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c=. a +&.*: b |
c=. a +&.*: b |
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keep=. (c=<.c)*.y>:a+b+c |
keep=. (c = <.c) *. y >: a+b+c |
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if.1 e.keep do. |
if. 1 e. keep do. |
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r=.r, a,.b ,.&(keep&#) c |
r=. r, a,.b ,.&(keep&#) c |
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end. |
end. |
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end. |
end. |
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) |
) |
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prim=:1 = 2 +./@{. |:</lang> |
prim=: 1 = 2 +./@{. |:</lang> |
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Example use: |
Example use: |
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<lang j>trips=:3 :0 |
<lang j>trips=:3 :0 |
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'm n'=. |:(#~ 1 = 2 | +/"1)(#~ >/"1),/,"0/~}.i.<.%:y |
'm n'=. |:(#~ 1 = 2 | +/"1)(#~ >/"1) ,/ ,"0/~ }. i. <. %: y |
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prim=. (#~ 1 = 2 +./@{. |:) (#~ y>:+/"1)m (-&*:,. +:@*,. +&*:) n |
prim=. (#~ 1 = 2 +./@{. |:) (#~ y >: +/"1)m (-&*: ,. +:@* ,. +&*:) n |
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/:~ ; <@(,.~ # {. 1:)@(*/~ 1 + y i.@<.@% +/)"1 prim |
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)</lang> |
)</lang> |
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