I also note that the assignment routine in your 'for ($chn=0;$chn<16384;$chn++)' loop is not (or at least not obviously) definitive: '$energy_before[$chn]' could end up empty for various values of '$chn'. E.g., if $i was greater than $calib_points (I don't know if there's anything in your surrounding code that would prevent that.) This would cause line 1148 (at the very least) to throw an 'undefined' warning. 


-- 
Human history becomes more and more a race between education and catastrophe. -- HG Wells

In reply to Re: Spurious `undefined' values and conversion issues by oko1
in thread Spurious `undefined' values and conversion issues by sf_ashley

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