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Hello, By accident I fell over a problem, which just did not expected... Via Windows ODBC (package RODBC) I download data from a MySQL 5.1 database. The amount is so large that the working set memory is going up to around 400MB. Not too large, I think. Anyhow, one column includes ten digit numbers. Somehow, not all of these numbers are displayed correctly. At some point all numbers turn to

In the Green Book, section 7.5 discusses new vector classes and uses quaternions as an example of a vector class that needs more than one number per element. I would like to define a new class that has a numeric vector and a logical vector of the same length that specifies whether the measurement was accurate. The following code does not behave as desired: >