ÿerror: () must be followed by . or close the index chain

[LucaLuca]

A=
3  5  6 -1
4  -1  9  1
6  3  5   2

G=find(a([1 3],:)<0)

ans =7

Now i want to change in G position in A([1 3],:) in value=10;

A([1 3],:)(G)=10


but i receive this error :

ÿerror: () must be followed by . or close the index chain





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