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  1. I\'m doing some aggregations on a data.table (excellent package!!!) and I found the .SD variable very useful for many things. However, using it slows down computation ...
    stackoverflow.com/questions/15273491/r-​data-table-slow... - Cached
  2. R data.table slow aggregation when using .SD. 5.SD columns in data.table in R. 4. Equivalent for dlply in data.table. 5. R: Data.table on subset excluding by value. 2
    stackoverflow.com/questions/8508482/​what-does-sd-stand... - Cached
  3. Data Aggregation in RExamples of using ... Using R as a GIS ... avg_y sd_z1 50.50248 1.9995112 50.52115 1.9988693 50.50778 1.998408>> #data.table ...
    www.slideshare.net/djandrija/data-​aggregation-in-r - Cached
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  4. Adobe PDF
    length-dependent self-aggregation in room temperature ionic liquids ... both the fast and slow diffusion coefficients decreased with ... using the SD, TD and AD ...
    web.ornl.gov/sci/first/publications/​041Guo.pdf
  5. ... R 2 = 0.9843, S.E. = 6.3) and SD:10uM ( , R 2 = 0 ... the reduced aggregation rate of the SD double ... may be due to a slow and incomplete aggregation ...
    www.ncbi.nlm.nih.gov/pmc/articles/​PMC2807408
    More results from ncbi.nlm.nih.gov »
  6. SD is a data.table containing the Subset of x \'s Data for each ... This is achieved by using R\'s column based ordered in-memory data.frame ... fast aggregation, ...
    www.inside-r.org/packages/cran/​data.table/docs/as.data.table - Cached
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  7. ... and remind me how to use the data.table ... The problematic examples are for instance the following normalization and aggregation ... data.table is a nice R ...
    toolslave.net - Cached
  8. Adobe PDF
    be aggregated ? Data Aggregation Yes ... Profit centre accounting data (table GLPCA), ... • For SD/MM/FI documents only. Use tcode ALO1 .
    hosteddocs.ittoolbox.com/​Archiving%20Requirement%20...
  9. Home » Questions » Why is plyr so s low? ... of various aggregation procedures in R. ... slower than data.table? And why didn\'t using the new data frame ...
    www.inside-r.org/questions/why-plyr-so-​slow - Cached
  10. Also data.table(M,M) will use make.names to make the ... names appear in j expression. No use of .SD or .SDF ... lines into the C (too slow up here in R) : ...
    r-forge.r-project.org/scm/viewvc.php/​pkg/R/data.table.R?... -     Cached