COIN-OR::LEMON - Graph Library

Changes between Version 6 and Version 7 of Ticket #74


Ignore:
Timestamp:
04/14/08 17:50:53 (14 years ago)
Author:
Balazs Dezso
Comment:

2) I uploaded the new patch based on your issue. 1) In my opinion, the rounding error is just a slightly dependent on this change. If t1 and t2 values are the retrieved timestamps and c is the clock time, then the (t2-t1)/c and the t2/c-t1/c should give back nearly the same value, because the division could not cause big relative error. But I think, the conversion from clock_t to double, which is already in the original version, could cause big relative error, when we subtract t1 from t2. However, on a regular linux desktop it does not cause problem, because the sensitivity of timer is at most 1/1000 second, and the double value has 52 binary digits, so more than 140 thousand years can measured with TimeStamp??.

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  • Ticket #74 – Description

    v6 v7  
    1 2) I uploaded the new patch based on your issue.
    2 1) In my opinion, the rounding error is just a slightly dependent on this change. If t1 and t2 values are the retrieved timestamps and c is the clock time, then the (t2-t1)/c and the t2/c-t1/c should give back nearly the same value, because the division could not cause big relative error. But I think, the conversion from clock_t to double, which is already in the original version, could cause big relative error, when we subtract t1 from t2. However, on a regular linux desktop it does not cause problem, because the sensitivity of timer is at most 1/1000 second, and the double value has 52 binary digits, so more than 140 thousand years can measured with TimeStamp.
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