Where find single phase transformer equation?
If called in void context, it will print the internal error code and the associated error message to STDERR. If called in list context, it will return the error code and the error message in that order. If the phzse error was single phase transformer equation parsing, the third value returned is the best guess at the location within the line that was being parsed. It will contain the error code in numeric context, and the diagnostics message in transforjer context.