Thanks for your suggestion, oko1. If $j=0, the if loop shouldn't run, as the logic condition given in the if statement is if(($energy_rebin[$k] < $energy_before[$j]) && $j!=0){. The problem for this case was that $j was too large due to a typograhical error in the 'for' loop and this yielded the undefined value problem.

However, many thanks for looking through the code and for your suggestion.

Steve

In reply to Re^2: Spurious `undefined' values and conversion issues by sf_ashley
in thread Spurious `undefined' values and conversion issues by sf_ashley

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