QR decomposition: Difference between revisions
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(→{{header|J}}: note built-in QR decomp function) |
(→{{header|J}}: trim example to match other lang implementations) |
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)</lang> |
)</lang> |
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'''Example''': <lang j> |
'''Example''': <lang j> QR 12 _51 4,6 167 _68,:_4 24 _41 |
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12 _51 4 |
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6 167 _68 |
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_4 24 _41 |
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QR matrix |
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+-----------------------------+----------+ |
+-----------------------------+----------+ |
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| 0.857143 _0.394286 _0.331429|14 21 _14| |
| 0.857143 _0.394286 _0.331429|14 21 _14| |
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| 0.428571 0.902857 0.0342857| 0 175 _70| |
| 0.428571 0.902857 0.0342857| 0 175 _70| |
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|_0.285714 0.171429 _0.942857| 0 0 35| |
|_0.285714 0.171429 _0.942857| 0 0 35| |
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+-----------------------------+----------+ |
+-----------------------------+----------+</lang> |
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x:&.> QR matrix NB. Display as exact fractions |
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+--------------------+----------+ |
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| 6r7 _69r175 _58r175|14 21 _14| |
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| 3r7 158r175 6r175| 0 175 _70| |
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|_2r7 6r35 _33r35| 0 0 35| |
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+--------------------+----------+</lang> |
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'''Example''' (polynomial fitting using QR reduction):<lang j> X=:i.# Y=:1 6 17 34 57 86 121 162 209 262 321 |
'''Example''' (polynomial fitting using QR reduction):<lang j> X=:i.# Y=:1 6 17 34 57 86 121 162 209 262 321 |
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