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Thanks for your reply. I am aware that the order of execution is unpredictable. However, what I<br>don't understand is why the values of t1 and t2 for corresponding i and i+1 varies. For instance in my example<br>I would be ok with the following output:<br><br><pre>0 1 1.000 2.000
2 3 3.000 4.000
3 4 4.000 5.000
1 2 2.000 3.000</pre>But (sometimes) I get is this:<br><pre>0 1 1.000 2.000
2 3 3.000 2.000
3 4 4.000 4.000
1 2 2.000 3.000<br><br>So the problem lies in the values of the last two columns.<br><br>-- Ingrid<br></pre><br> </div></body>
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