2017-08-03 19:21:25 +0100 | commented answer | how can i define a matrix product like a summation Thank you so much this is exactly i want |

2017-08-03 09:01:55 +0100 | asked a question | how can i define a matrix product like a summation first, my mother tongue is not English but I try it, my problem is that if I define a symbolic matrix V such that, var('V_11,V_12,V_13,V_21,V_22,V_23,V_31,V_32,V_33') and then I define But if I evaluate, for example but the code is not work can someone help me? |

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