Have a look at the dokumentation of printf:

perldoc -f sprintf

You need a format string to format your values. You can try something like this:

printf "$l, $j, %.3f, %.3f, %.3f, %.3f\n", $Hx, $Hy, $Hxy, $mutual;

In reply to Re: use of print f and sprint f by busunsl
in thread use of print f and sprint f by replicant4

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