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# Unrecognized function or variable error code help required

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Karim Wahdan 2021 年 1 月 22 日
コメント済み: Jan 2021 年 1 月 23 日
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

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### 回答 (1 件)

Tayyab Khalil 2021 年 1 月 22 日
This is because A_i is undefined in the code but is being used. What value do you want it to have?
##### 8 件のコメント表示非表示 7 件の古いコメント
Jan 2021 年 1 月 23 日
Of course you should do this by:
A_i = 10;
Please post the complete error message and the corresponding code. I cannot guess where this error occurs.

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