cosq1b cosq1f cosq1i cosqmb cosqmf cosqmi sinq1b sinq1f sinq1i sinqmb sinqmf sinqmi

cosqmi() void cosqmi ( int  n, double  wsave[], int  lwsave, int *  info  ) Initialization of work data for cosqmf and cosqmb Purpose cosqmi initializes array wsave[] for use in its companion routines cosqmf and cosqmb. The prime factorization of n together with a tabulation of the trigonometric functions are computed and stored in array wsave[]. Note - The initialization of wsave[] is not necessary for the succeeding call of cosqmf or cosqmb for the same n value. If the value of n has been changed, wsave[] should be re-initialized by this routine. Parameters [in] n The length of the sequence to be transformed. (n >= 1) The transform is most efficient when n is a product of small primes. [out] wsave[] Array wsave[lwsave] Work data, containing the prime factors of n and also containing certain trigonometric values which will be used in routines cosqmf or cosqmb. [in] lwsave The length of the array wsave[]. (lwsave >= 2*n + ln(n)/ln(2) + 4) [out] info = 0: Successful exit = -1: The argument n had an illegal value (n < 1) = -3: The argument lwsave had an illegal value (lwsave not big enough) Reference FFTPACK 5.1