I have a data frame named all_cars containing 1082 rows and 1583 columns.  Each row represents an observation; each column represents a variable.  Every data value is an integer or decimal value; there are no nulls or non-numeric strings.  I want to use the tilting library to do variable selection.  I enter a command like

> all_cars_tilt <- tilting(all_cars[,10:20], all_cars[,2], op=2)

and get the response

Error in t(X[, active, drop = FALSE]) %*% X[, active, drop = FALSE] :  requires numeric/complex matrix/vector arguments

If I try the command with a larger range of X variables (say 6:384), the command seems to hang.  I have run spikeslab on the same data set (columns 6:384 as X, column 2 as Y), without difficulty.  Can anyone help me interpret the error message?

Thanks!

Todd Morley
Principal Consultant
CLEAR PEAK
Denver     303.470.9230  Ext. 5102
Mobile      720.560.8901
Web          www.clearpeak.com<http://www.clearpeak.com/>


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