Timeline for Fourier and InverseFourier precision [duplicate]
Current License: CC BY-SA 3.0
8 events
| when toggle format | what | by | license | comment | |
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| Jan 12, 2015 at 9:17 | history | closed |
ybeltukov Yves Klett Öskå Jens Sjoerd C. de Vries |
Duplicate of Why does Fourier give a large error in MachinePrecision? | |
| Jan 11, 2015 at 19:31 | review | Close votes | |||
| Jan 12, 2015 at 9:17 | |||||
| Dec 12, 2014 at 19:18 | comment | added | Daniel Lichtblau | They default to machine precision when input has infinite precision. | |
| Dec 12, 2014 at 18:00 | answer | added | Wolfy | timeline score: 0 | |
| Dec 12, 2014 at 17:55 | comment | added | Wolfy | Aww, Chop is the secret! Thanks so much! And yes, my bad for using Abs. For some reason I thought I was dealing with non-negative signals... | |
| Dec 12, 2014 at 17:35 | comment | added | Nasser |
Chop[x1 - Abs[x1]] gives {0, 0, 0, -1.5136, -1.91785, -0.558831, 0, 0, 0, -1.08804, -1.99998, -1.07315, 0, 0, 0, -0.575807, -1.92279, -1.50197, 0, 0}
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| Dec 12, 2014 at 17:18 | comment | added | MikeLimaOscar |
Try x - Chop[x1] to remove the small imaginary components rather than taking the magnitude, discarding the sign of x1!
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| Dec 12, 2014 at 16:49 | history | asked | Wolfy | CC BY-SA 3.0 |