search for: wrightsoft

...] == "bob"]<-"sue" ? A semi-related question: how does one get the index of a column by name, something along the lines of col.index( X, "sue") ? Chip Barnaby --------------------------------------------------------- Chip Barnaby cbarnaby at wrightsoft.com Vice President of Research Wrightsoft Corp. 781-862-8719 x118 voice 131 Hartwell Ave 781-861-2058 fax Lexington, MA 02421 www.wrightsoft.com

...s. Also, I assume that lm() does not make a copy of input data? That is, if I want "predict( LMX[ i])", I would have to retain a copy the associated DXS subsets? TIA, Chip Barnaby --------------------------------------------------------- Chip Barnaby cbarnaby at wrightsoft.com Vice President of Research Wrightsoft Corp. 781-862-8719 x118 voice 131 Hartwell Ave 781-861-2058 fax Lexington, MA 02421 www.wrightsoft.com

...row value of vx is overwritten. A2 would have 10 times as many rows as A. I have of course discarded idea of using of a for loop, but maybe that is what it takes. TIA etc, Chip Barnaby --------------------------------------------------------- Chip Barnaby cbarnaby at wrightsoft.com Vice President of Research Wrightsoft Corp. 781-862-8719 x118 voice 131 Hartwell Ave 781-861-2058 fax Lexington, MA 02421 www.wrightsoft.com

...gregate() examples (e.g. in help()) elegantly produce the "right result" with nicely named columns etc. I can't seem to make things work so smoothly. Thanks! Chip Barnaby --------------------------------------------------------- Chip Barnaby cbarnaby at wrightsoft.com Vice President of Research Wrightsoft Corp. 781-862-8719 x118 voice 131 Hartwell Ave 781-861-2058 fax Lexington, MA 02421 www.wrightsoft.com

...unction(x) weighted.mean(x$IAC, x$Wt)) : arguments must have same length How does one pass grouped arguments to processing functions such as weighted.mean() ? TIA, Chip Barnaby --------------------------------------------------------- Chip Barnaby cbarnaby at wrightsoft.com Vice President of Research Wrightsoft Corp. 781-862-8719 x118 voice 131 Hartwell Ave 781-861-2058 fax Lexington, MA 02421 www.wrightsoft.com

...be coerced into a data.frame (although it seems to me that such a conversion could be usefully defined), so now I don't hit myself on the head with that particular hammer.) Chip Barnaby --------------------------------------------------------- Chip Barnaby cbarnaby at wrightsoft.com Vice President of Research Wrightsoft Corp. 781-862-8719 x118 voice 131 Hartwell Ave 781-861-2058 fax Lexington, MA 02421 www.wrightsoft.com

...3.7197313 4.7970026 5.8742739 6.9515453 8 9 10 8.0288166 9.1060879 10.1833592 Warning message: 'newdata' had 7 rows but variable(s) found have 10 rows > --------------------------------------------------------- Chip Barnaby cbarnaby at wrightsoft.com Vice President of Research Wrightsoft Corp. 781-862-8719 x118 voice 131 Hartwell Ave 781-861-2058 fax Lexington, MA 02421 www.wrightsoft.com

...lumns that a data.frame can have? For example, can I read.csv() a file that has 1000 columns and 10,000 rows, will it break or is it limited by available memory. ................................................................................... Philip Sobolik 781-862-8719 x111 Wrightsoft Corporation 781-861-2058 fax 394 Lowell Street, Suite 12 epsobolik at wrightsoft.com Lexington, MA 02420 www.wrightsoft.com