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MathCAD help! Multiplying matrices with variables. 
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#1
Sep3009, 07:10 PM

P: 4

I am fairly novice user of MathCAD. I am using version 14. I am trying to multiply a diagonalized 3x3 matrix containing only variables with another matrix completely populated with numbers and no variables. However, when I create the 3x3 matrix with only variables, the variables are highlighted and MathCAD tells me “the variable is undefined”. I am hoping to multiply these to matrices and have a result with the variables multiplied by constants. I know this can easily be done by hand, but I would like to learn how to do this with MathCAD so I can be prepared when I have to multiply larger matrices in the future. Any thoughts?



#2
Oct109, 04:27 AM

P: 341

First define your variables one by one then later put them into the matrix



#3
Oct109, 08:29 AM

P: 4

Is there a way to do it without defining the variables? I would like a solution that contains the variables in it, and if I define the variables beforehand, then they are eliminated in the operation.



#4
Oct109, 09:16 AM

P: 341

MathCAD help! Multiplying matrices with variables.
I don't get your question exactly and I don't use MathCAD but it is a common mistake. what I mean is define a b c d as symblolic variable. Then A = [a b;c d].



#5
Oct209, 06:27 PM

P: 4

Bump for any help. Thanks!



#6
Oct1209, 08:42 PM

P: 4

Any ideas?!?



#7
Oct1309, 01:00 AM

PF Gold
P: 472

I dont have mathcad but maybe this site will help, its all examples:
http://www.math.upenn.edu/~gjporter/ila/ 


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