static String toS(float[] a){
  String s="[";
  if (a == null) {
    return "[null]";
  }
  for (int i=0; i < a.length; i++) {
    if (i != 0) {
      s+=" , ";
    }
    String t=df.format(a[i]) + "       ";
    s+=t.substring(0,7);
  }
  s+="]";
  return s;
}

static String toS ( float [ ] a ) { String s = "[" ; if ( a == null ) { return "[null]" ; } for ( int i = 0 ; i < a . length ; i ++ ) { if ( i != 0 ) { s += " , " ; } String t = df . format ( a [ i ] ) + "       " ; s += t . substring ( 0 , 7 ) ; } s += "]" ; return s ; }
convert an array of floats to fixed length strings
