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- Use the traceback() function in R after an error occurs.

It will print out the sequence of function calls that lead to the error.

Variations include:

Error in single.na(to) : argument is missing, with no default

Typical cause: A leading or trailing comma in your code makes R think that you wanted to pass in a parameter, but left it empty (hence "missing, with not default")

Examples:

leading comma

to=c(,'x','y','z')

trailing comma

mxMatrix("Name"

nrow=3,ncol=3,free=TRUE, values=.5,

)

Cure: remove the errant comma

Vexing Error Code #1

Warning messages:

1: In convertVFN(values, free, labels, lbound, ubound, nrow, ncol) :

NAs introduced by coercion

2: In convertVFN(values, free, labels, lbound, ubound, nrow, ncol) :

NAs introduced by coercion

3: In convertVFN(values, free, labels, lbound, ubound, nrow, ncol) :

NAs introduced by coercion

4: In convertVFN(values, free, labels, lbound, ubound, nrow, ncol) :

NAs introduced by coercion

5: In convertVFN(values, free, labels, lbound, ubound, nrow, ncol) :

NAs introduced by coercion

6: In convertVFN(values, free, labels, lbound, ubound, nrow, ncol) :

NAs introduced by coercion

7: In convertVFN(values, free, labels, lbound, ubound, nrow, ncol) :

NAs introduced by coercion

8: In convertVFN(values, free, labels, lbound, ubound, nrow, ncol) :

NAs introduced by coercion

9: In convertVFN(values, free, labels, lbound, ubound, nrow, ncol) :

NAs introduced by coercion

10: In convertVFN(values, free, labels, lbound, ubound, nrow, ncol) :

NAs introduced by coercion

This error occurs when I attempt to introduce 10 new 1X1 matrices into a model coded using the path specification approach (see code on the "Errors Returned by R" thread).

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