Hi there, In amongst my code I have the following loop: for(j=0;j<q;j++) { if((!data4.fail())&&(time_olp==time_scp[j])) { for(i=0;i<p;i++) { data4 >> temp>>OD_olp[i][j]; } } } Now for some reason when data4.fail() I get a segmentation error, commenting out this section rectifies the problem, thus for some reason even though the if statement is not met, and the subsequent instructions are not executed, it gives a fault. I'm still using root 2.25 (root 3.02 doesn't like my code!) Any ideas? Cheers Chris Milne
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