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I have a problem, I want to compute kronecker product as given below;

rho1 = MatrixForm[KroneckerProduct[{{1}, {0}}, {{1, 0}}]]; 
rho2 = MatrixForm[KroneckerProduct[{{1}, {0}}, {{1, 0}}]]; 
rho3 = MatrixForm[KroneckerProduct[{{1}, {0}}, {{1, 0}}]]; 
rho = MatrixForm[KroneckerProduct[rho1, rho2, rho3]]

and I get

MatrixForm[KroneckerProduct[MatrixForm[{{1, 0}, {0, 0}}], 
MatrixForm[{{1, 0}, {0, 0}}], MatrixForm[{{1, 0}, {0, 0}}]]]

Why the ouput not evaluate the kroneckerproduct and become a single matrix

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    $\begingroup$ MatrixForm is something used for printing. Never use it in calculations, or define variables with it. $\endgroup$ Jun 21 '16 at 8:16
  • $\begingroup$ what @MariusLadegårdMeyer is saying , rho1 = KroneckerProduct[{{1}, {0}}, {{1, 0}}] and likewise. After you evaluate rho, use MatrixForm[rho] to see how it looks. $\endgroup$
    – Sumit
    Jun 21 '16 at 8:20
  • $\begingroup$ ok. thanks. I try it and get the result. thank you again for helping me $\endgroup$
    – munirah
    Jun 21 '16 at 8:23
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If you do want MatrixForm, then do it in this way.

(rho1 = KroneckerProduct[{{1}, {0}}, {{1, 0}}]) // MatrixForm
(rho2 = KroneckerProduct[{{1}, {0}}, {{1, 0}}]) // MatrixForm
(rho3 = KroneckerProduct[{{1}, {0}}, {{1, 0}}]) // MatrixForm
(rho = KroneckerProduct[rho1, rho2, rho3]) // MatrixForm

enter image description here

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  • $\begingroup$ Thank you for suggestion coding. I will used it. $\endgroup$
    – munirah
    Jun 21 '16 at 8:38

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