CVXOPT QP Solver: TypeError: 'A' must be a 'd' matrix with 1000 columns

i have try A=A.astype(double) to solve it, but it is invalid, since python doesn't know what double is or A has no method astype.

therefore

via using A = matrix(A, (1, m), 'd') could actually solve this problem!

Your matrix elements have to be of the floating-point type as well. So the error is removed by using A = A.astype('float') to cast it.