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...a) [1] "POSIXlt" "POSIXt" Fine. Now, if I do some arithmetic on that object, the result is converted to POSIXct. > class (a - 360) [1] "POSIXct" "POSIXt" Does this seem weird? I'm running R 2.12.1 under Windows XP. Thanks, Sam Buttrey [[alternative HTML version deleted]]

Hi, I am working with lpSolve "R" package by Sam Buttrey, buttrey at nps.navy.mil , which is interface to lp_solve linear/integer programming system. You can find information about lp_solve at http://groups.yahoo.com/group/lp_solve/ (free registration required). lpSolve (R package) supports linear and integer programming but it does not suppo...

...nt Patterns Volume 12, Issue 06 Johnstone and Silverman EbayesThresh: R Programs for Empirical Bayes Thresholding Volume 12, Issue 08 Nason pinktoe: Semi-automatic Traversal of Trees Volume 14, Issue 01 Imai and Van Dyk MNP: R Package for Fitting the Multinomial Probit Model Volume 14, Issue 03 Buttrey Calling the lp_solve Linear Program Software from R, S-PLUS and Excel Volume 14, Issue 04 Zeileis and Grothendieck zoo: S3 Infrastructure for Regular and Irregular Time Series Volume 14, Issue 06 Terpstra and McKean Rank-Based Analyses of Linear Models using R Volume 14, Issue 07 === Jan de Leeu...

...nt Patterns Volume 12, Issue 06 Johnstone and Silverman EbayesThresh: R Programs for Empirical Bayes Thresholding Volume 12, Issue 08 Nason pinktoe: Semi-automatic Traversal of Trees Volume 14, Issue 01 Imai and Van Dyk MNP: R Package for Fitting the Multinomial Probit Model Volume 14, Issue 03 Buttrey Calling the lp_solve Linear Program Software from R, S-PLUS and Excel Volume 14, Issue 04 Zeileis and Grothendieck zoo: S3 Infrastructure for Regular and Irregular Time Series Volume 14, Issue 06 Terpstra and McKean Rank-Based Analyses of Linear Models using R Volume 14, Issue 07 === Jan de Leeu...