what is the meaning of '.' in the below equation?

i saw an equation like tis ... but while running its showing error... pls tell what is the meaning of "." in below equation an how the answer to be come for this equation? F=(X1.-1)^2+(X2.-2.2)^2+1;

[Chandra Kurniawan]

What is X1 and X2?

a scalar or a matrix?

[Ambika]

X1 and X2 are scalars

Answer 1

[Andrew Newell]

What is the "meaning" of an erroneous expression? Probably the intended expression was

F=(X1-1).^2+(X2-2.2).^2+1;

Here .^ is the element-by-element power (see Array arithmetic).

[Ambika]

lot of thanks for helping