I am trying to solve the problem below using cvx, and I am having trouble expressing the first subject expression

I am a beginner in cvx, and I was using this way to express, then it report an error, could any one tell me what is wrong with it?

I don’t know what everything is. It looks rather dubious to me that `|g*w|`

means `det(g*w|`

in this case, because I strongly suspect that `g*w`

is not a matrix. But it’s “your” problem (in the sense that you copied it from a paper or book), so you should know.

Is

`norm([1;g*w;(t-1)/2]) <= (t+1)/2`

correct?

BTW, your use of `inv_pos(2)`

is not wrong, but seems to unnecessarily complicate things, so I didn’t use it. I only use `inv_pos`

when its argument is a CVX varaible or expression, not a constant.

The error message is because CVX requires the argument of `norm`

to be affine.

help cvx/norm

`Disciplined convex programming information: norm is convex, except when P<1, so an error will result if these non-convex "norms" are used within CVX expressions. norm is nonmonotonic, so its input must be affine.`

you’re right, in this case g is a row vector and w is a column vector. I mistakenly thought g*w is a matrix.
and norm([1;g*w;(t-1)/2]) <= (t+1)/2 really worked!!! thank you very much!

(as to using inv_pos(2), this is because I once received an error on a sentence with “/” , then I changed to inv_pos, and now I know the problem is not because of “/”.Thank you again.)