Dear Allin,

I think there's something "strange" with the special
accessor $["roots"]. Please take a look at the following
Hansl code:

<hansl>
# Gretl doesn't save the "r" matrix
open data9-7
loop i = 1..2
    arima $i 1 2 ; QNC
    matrix r = $["roots"] # overwrites "r"
    print r
endloop

# Gretl saves the "r" matrix
open data9-7

arima 1 1 2 ; QNC
matrix r = $["roots"]
print r

arima 2 1 2 ; QNC
matrix r = $["roots"] # overwrites "r"
print r
</hansl>

I think this is a little bit weird because I can use the
same ideia with another kind of accessor:

<hansl>
open data9-7
loop i = 1..2
    arima $i 1 2 ; QNC
    matrix c = $coeff
    print c
endloop

open data9-7
loop i = 1..2
    arima $i 1 2 ; QNC
    matrix t = $test
    print t
endloop

open data9-7
loop i = 1..2
    arima $i 1 2 ; QNC
    matrix p = $pvalue
    print p
endloop
</hansl>

Thanks in advance,
Henrique Andrade