Unrecognized function or variable error code help required

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Karim Wahdan 2021-1-22

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https://ww2.mathworks.cn/matlabcentral/answers/723638-unrecognized-function-or-variable-error-code-help-required

评论： Jan 2021-1-23

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I have created code on low rank assumption using nuclear norm using CVX. I am getting the following error code -

Unrecognized function or variable 'A_i'.

Error in Untitled3 (line 21)

y(i_m) == trace(A_i)*Xe;

here is my code any help will be appricated

r = 2; % the rank;
n = 4; % the dimension
a = randn(n,r);
b = randn(n,r);
X = a*b'; % low rank Matrix;
m=fix(n^2-1);
A = randn(n, n);
y = trace(A*X);
% low rank approximation using nuclear norm
cvx_begin
variable Xe(n,m)
minimize norm_nuc(Xe)
subject to
A*Xe == y
cvx_end
     for i_m = 1 : m
   y(i_m) == trace(A_i*Xe);
end
error = norm(X-Xe)
for m = 1 : 10 : n^2
   for mc = 1 : MONTE_CARLO
     % Generate measurements
     y = zeros(m, 1);
for i_m = 1 : m
   A_i = randn(n, n);
   y(i_m) = trace(A_i*X);
end
     % Solve problem
     % Store results
   end
end