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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

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).

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

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