Fast Fourier transform: Difference between revisions
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m (→{{header|REXX}}: changed the way REXX sets NUMERIC DIGITS (based on "size" of pi). -- ~~~~) |
m (→{{header|REXX}}: changed comment about the pi function result (used as a maximal value for DIGITS). -- ~~~~) |
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<br>This is called zero-padding. |
<br>This is called zero-padding. |
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<lang rexx>/*REXX pgm does a fast Fourier transform (FFT) on a set of complex nums.*/ |
<lang rexx>/*REXX pgm does a fast Fourier transform (FFT) on a set of complex nums.*/ |
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numeric digits length( pi() ) - 1 /*limited by PI function |
numeric digits length( pi() ) - 1 /*limited by PI function result. */ |
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arg data; if data='' then data='1 1 1 1 0' /*no data? Then use default*/ |
arg data; if data='' then data='1 1 1 1 0' /*no data? Then use default*/ |
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data=translate(data, 'J', "I") /*allow use of i as well as j */ |
data=translate(data, 'J', "I") /*allow use of i as well as j */ |
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