get Data1_a -e e; // gets the end row of the dataset
type e;

I receive "100" in response. So everything is OK up to here. But now I command,

aa=-100;
bb=0.02;
Data1_b=10^(aa+bb*Data1_a);

and the result is calculated until item 3768! New rows are created in my worksheet, with value 0/0 for index>100, but it takes its time in any case! I don't see what is making this happend, so please send me any clue.

Thanks,

jose.

(I imagine that it has to do with some mixing of vector and scalar notations, as if I replace "aa" and "bb" with their numerical values in the asignment expression, things work, but I don't know how to do it with variables...)

Data1_a=data(1,100);

bb=0.02;
aa=-100;

Data1_b=Data1_a;
Data1_b*=bb;
Data1_b+=aa;
Data1_b=10^(Data1_b);

But I still have the doubt about why the other notation gives that weird result...