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Joined: 15/04/2012(UTC) Posts: 1,986  Was thanked: 1124 time(s) in 721 post(s)
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Perhaps not a bug, but a problem. The importdata(9) function has a quadratic dependence of time consumption versus datasets read. For large files this becomes prohibitive. Pre-allocation of the matrix does not help. If you read the file piecewise into separate matrices, then the time consumption is linear. However, combining them using stack() turns out to be even more ineffective. Other operations like column extraction or plotting augmented columns fast in comparison to read operation. Therefore, an efficient text file reading routine would be highly welcome. If you want to try the example, put data and .sm file in the same directory and launch the .sm file there. Edited by user 23 March 2014 14:02:12(UTC)
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 1 user thanked mkraska for this useful post.
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Rank: Advanced Member Groups: Registered
Joined: 15/04/2012(UTC) Posts: 1,986 Was thanked: 1124 time(s) in 721 post(s)
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Problem solved. The quadratic time dependence holds for optimization> symbolic. For optimization> numeric, the time dependence is approximately linear. Edited by user 08 September 2013 15:53:02(UTC)
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