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$a= 20;
$b= 22.5;
...
    $matrixflags[$row - 2][$i] = 1;
}
...

((btoc < 1) && (btoc > -1))

if ($atob+$atoc+$btoc) {
    printf OUTFILE "DIFF=%d:   %f,  %f,  %f\n",
...
$matrixflags[$row - 3][$i] = $atoc;
$matrixflags[$row - 2][$i] = $atob;
}