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Joined: Jan 2005
Nelson is right -- do as he says.
As indicated on the back plate of the HP-15C (see table with capital Sigma on left side), statistical summations use numbered registers 2-7. So, highest-numbered register allocated for use from free memory must be at least 7. (BTW, registers 0 and 1 can never be deallocated.)
The "MEM" command will identify the present highest-numbered allocated register as the leftmost number displayed by the command.
Error 3 (as shown by the ERROR table on the back plate) indicates an attempt to use a register (R?) or array element (Aij?) that has not been made available by the "DIM" command.
-- KS
Edited: 29 Sept 2004, 10:29 p.m.