sorry....... i have changed the format of my post.

Jethro: the common is at every 192 of speed value, i trucated the dataset and only put one link speed record here, there are 66 links in the dataset. sorry for the confusion. thanks for your suggestion, i will give it a try now.

In reply to Re^2: How to transform the data with Perl by hujunsimon
in thread How to transform the data with Perl---Solved !!! by hujunsimon

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