variance of portfolio as objective function

how would be able to set up the variance of a portfolio as an seperate objective function?

I have the data read in from excel already

Answer 1

[Star Strider]

Anonymous Functions

Answer 2

[Image Analyst]

What do you mean? There already is a built in function for variance called var(). Why do you need to make your own function for that?

[Sameer]

because i have to minimize this function, with constraints

[Star Strider]

Use an anonymous function.

[Sameer]

whats that