Unable to have an assignment because value of type 'cvx' is not convertible to 'double'

1

Here is my code

cvx_begin
variable W(N,I) complex
variable u(I,1)
variable y
variable t(I,1)
variable m(I,1)
variable v(I,1)

    expression V1(I,1)
    expression V2(I,1)
    expression V3(I,1)

    V1 = zeros(I,1);
    V2 = zeros(I,1);
    V3 = zeros(I,1);
    for i=1:I
        hi = h(:,i);
        for l=1:I
            if(l~=i)
                V1(i) = V1(i) + real(W(:,l)'*conj(hi)*hi.'*W(:,l));
                V2(i) = V2(i) + 2*sqrt(m_hat(i)*v_hat(l))*sqrt(m(i)*v(l));
                V3(i) = V3(i) + m_hat(i)*v_hat(l)/(1 + m_hat(i)*v_hat(l))*(m(i)^2+v(l)^2)/2;
            end
        end

Matlab says "Unable to perform assignment because value of type ‘cvx’ is not convertible to ‘double’ ". The error is at this line “V1(i) = V1(i) + real(W(:,l)‘*conj(hi)*hi.’*W(:,l));” and h is a given complex variable matrix.

I have already use expression to store V1, V2 and V3, so i don’t know why it has this error.

2

Remove

V1 = zeros(I,1);
V2 = zeros(I,1);
V3 = zeros(I,1);

Those statements override the earlier expression declarations. Hence the error message. Note that every element of an expression is automatically initialized to zero by CVX.

3

wow, it really works, thanks bro!!