# fouriertest.frink

```// // Test of the functions defined in Fourier.frink // //use Fourier.frink length = 64 // Testing.  Create a regular sinewave f = new array for j=0 to length-1   f@j = 10 cos[4.1 j/(2 pi)] + 8 sin[17.3 j/(2 pi)] // Test and time DFT case. start = now[] b = DFT[f] //println[b] end = now[] println["Time in DFT is " + (end-start -> "ms")] //scr = padAndScramble[f] //println["Scrambled: \$scr"] //println[f] start = now[] bb = FFT[f] end = now[] println["Time in FFT is " + (end-start -> "ms")] //println[bb] //for [e] = bb //   println[abs[e]] inverse = InverseFFT[bb] println["Ratio"] largest = 0 for n = 0 to length-1 {    if abs[bb@n - b@n] > largest    {       largest = abs[bb@n - b@n] //      println["MISMATCH at index \$n:" + (bb@n-b@n)]    } } println["Largest error is " + largest] println["Ratio Inverse"] largest = 0 for n = 0 to length-1 {    if abs[bb@n - b@n] > largest    {       largest = abs[bb@n - b@n] //      println["MISMATCH at index \$n:" + (bb@n-b@n)]    } } println["Largest error is " + largest] //println[inverse] ```

This is a program written in the programming language Frink.
For more information, view the Frink Documentation or see More Sample Frink Programs.

Alan Eliasen was born 18107 days, 14 hours, 35 minutes ago.