[R] Question in using e1071 svm routine

[nathan.kupp]

R, by default, has some of the most cryptic error / debug messages ever
invented. The error message encountered by the two posters:

Error in if (any(co)) { : missing value where TRUE/FALSE needed
In addition: Warning message:
In FUN(newX[, i], ...) : NAs introduced by coercion

results from the inclusion of a factor variable in the x data frame passed
to the svm(x,y) call. I've mistakenly done this many times; the text of the
error message gives no indication that this is the source of the problem.
Removing the factor(s) from x will eliminate the error.

Nathan Kupp
Ph.D. Candidate
Department of Electrical Engineering
Yale University
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