Dears

I want to do minimization in CVX, but I got error

minimize norm y-sum(Ai*xi*z) with given x

it means I want to find A but because of practical material I need to calculate " i rows of matrix A " and then do multiplication in i th row of vector x and do it again.

A is a matrix 100*25 (unknown)
y is a vector 25*1(known)

x is a vector 25

*1(known)*

z is a vector 251(known)

z is a vector 25

so as I said I derive A1 by 25 rows of matrix A and then calculate A1

*xi*z and do it four times and then adding them to find sum(Ai

*xi*z) at final I want to minimize norm (y- sum(Ai

*xi*z) )

I do not know how to implant this in CVX because if I says my variable is A how can I implement it in minimization part ?

I hope this help to know what am I saying and Thanks for help

regard