text: /*============================================================================
   * Daniel J. Greenhoe
   * operations on sequences over R^4
   *============================================================================*/
  /*=====================================
   * operations on R^4 sequences
   *=====================================*/
  extern int min(seqR4 *xR4, seqR1 *ymin);
  extern int max(seqR4 *xR4, seqR1 *ymax);
  extern void mag(seqR4 *x, seqR1 *y);
  extern void convolve(seqR4 *x, seqR1 *y, seqR4 *z, int showcount);
  inline void convolve(seqR4 *x, seqR1 *y, seqR4 *z){convolve(x,y,z,1);}
  
  