ftp.nice.ch/pub/next/unix/audio/cmusic.bs.N.tar.gz#/src/pvdsp/checkroots.c

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#include "pv.h"

void findpoles( float coef[], complex pole[], int M ) {
 int i ;
 complex *a ;

    a = (complex *) malloc( (M+1)*sizeof(complex) ) ;
    for ( i = 0 ; i <= M ; i++ ) {
	a[i].re = coef[i] ;
	a[i].im = 0. ;
    }
    findroots( a, pole, M ) ;
    for ( i = 0 ; i < M ; i++ )
	pole[i] = cdiv( one, conjg( pole[i] ) ) ;
    free( a ) ;
}

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.