Re: calculating the average of arrays

you can use this: if (isset($f[$index][f_d1_weight]) && !empty($f[$index][f_d1_weight])) { // process item here } "Bart Verbeek" <b.verbeek@creative-edge.nl> wrote in message news:KDEGLILLMKMDKJGAMGHIAEOICAAA.b.verbeek@creative-edge.nl... > Hello, > > I want to calculate an average from the following variables/arrays > > a - $f[$index][f_d1_perc] with $f[$index][f_d1_weight] > b - $f[$index][f_d2_perc] with $f[$index][f_d2_weight] > c - $f[$index][f_d3_perc] with $f[$index][f_d3_weight] > d - $f[$index][f_d4_perc] with $f[$index][f_d4_weight] > e - $f[$index][f_d5_perc] with $f[$index][f_d5_weight] > > All varables are integers: > - $f[$index][f_d _perc] = 0 - 100 > - $f[$index][f_d1_weight] = 0 - 10 > > I want the folowing: > > total score = (a * weight) + (b * weight) + (c * weight) + (d * weight) > + (e * weight). > total vars = weight a + weight b + weight c + weight d + weight e. > Average = total score / total average. > The calulated average has to be stored in "$f[$index][f_perc]". > > The problem is that not always all the variables are set. How do I check > these arrays and leave them out of the calculation when they don't contain a > value. > > Hope anyone can help me... > > > >