-ridder- (STB) declares version 3.1.
Sergiy is correct about global names.
This is documented. The on-line help for -version- spells it out:
If you set version to 6.0 or less
1. macro substitution is made on the basis of the first
seven (local) or eight (global) characters of the name;
`thisthatwhat' is the same as `thistha'
I've not tried it but my guess is that setting -ridder- to -version 7-
might be enough to fix this.
But Roger Newson wrote a Mata routine for Ridders' algorithm that I
think was written before Stata 10. That is surely the thing to use.
Nick
[email protected]
Sergiy Radyakin
One problem that I've noticed with -ridder- is that it does not
understand global names longer than 8 symbols, e.g. if my F() returns
the result in global test_res, ridder F X returns macro test_res =
-0.01 from 0 to 0.2 works fine, but if F() returns the result in
global test_res2, then ridder F X returns macro test_res = -0.01 from
0 to 0.2 comes to an error because it evaluates both F(LEFT)=0 and
F(RIGHT)=0. Perhaps it's a limitation of the older Stata due to
version?
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