Undefined function or variable 'cvx_begin'
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Hi everyone! I'm trying to understand how does matlab work with the matrix factorization which related to my task now. I used this code to test for matrix factorization. And the code dont run because of a function. The warning told that: "Undefined function or variable 'cvx_begin'". What should I fix it? Have any professional matlaber help me? Thank you in advance. Here is my code:
% Generate data matrix A
rstate = rand();
m = 10; n = 10; k = 5;
A = rand(m,k)*rand(k,n);
% Initialize Y randomly
Y = rand(m,k);
% Perform alternating minimization
MAX_ITERS = 30;
residual = zeros(1,MAX_ITERS);
for iter = 1:MAX_ITERS
cvx_begin quiet
if mod(iter,2) == 1
variable X(k,n)
X >= 0;
else
variable Y(m,k)
Y >= 0;
end
minimize(norm(A - Y*X,'fro'));
cvx_end
fprintf(1,'Iteration %d, residual norm %g\n',iter,cvx_optval);
residual(iter) = cvx_optval;
end
% Plot residuals
plot(residual);
xlabel('Iteration Number');
ylabel('Residual Norm');
% Display results
disp( 'Original matrix:' );
disp( A );
disp( 'Left factor Y:' );
disp( Y );
disp( 'Right factor X:' );
disp( X );
disp( 'Residual A - Y * X:' );
disp( A - Y * X );
fprintf( 'Residual after %d iterations: %g\n', iter, cvx_optval );
3 个评论
Adam Danz
2018-7-16
Please format your code so it can be copied, pasted, and examined. The idea here is to make as little work as possible for the people who are eager to help you.
Without looking at the code, I can say that your script is trying to execute a command named 'cvx_begin' and there is no variable in your work space named that and there is no function on your matlab path named that either.
Is it your code or someone else's? If it is yours then what do you expect cvx_begin to be? Why do you expect the code to know of it if you haven't defined it?
cvx_begin quiet
is a meaningless line. What is it supposed to be doing?
采纳的回答
Steven Lord
2018-7-16
0 个投票
The cvx_begin function is not from any MathWorks-provided toolbox. I believe that it's part of this toolbox. You will need to download and install that toolbox to use that function.
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