Symbolically solving vectors simultaneously
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Ramses Young
il 30 Apr 2022
Commentato: Star Strider
il 1 Mag 2022
Hello, I have been trying to solve a vector using the symbolic toolbox and am running into an error that says "Error using maplemex
Error, (in MTM:-solve) 0 variables do not match undefined outputs.", I am currently trying to solve for a variable in a matrix that is equal to zero, below is an example.
syms q0
moment=[5*q0+25 6*q0+45 5*q0+45]
[q0]=solve(moment==0)
This specific example is solving moment equilibrium for a monocoque structure.
Is there a way to solve the seperate q0 values so its a vector like [q0_1 q0_2 q0_3] using the symbolic toolbox?
Thanks!!!
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Star Strider
il 30 Apr 2022
One solve statement (such as in the original post) also fails in R2022a. One option to get all of the solutions is arrayfun that should be available (another is an explicit loop) —
syms q0
moment = [5*q0+25 6*q0+45 5*q0+45];
q0 = arrayfun(@(x)solve(x), moment)
.
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Paul
il 30 Apr 2022
q0 = sym('q0_',[1 3])
moment=[5*q0(1)+25 6*q0(2)+45 5*q0(3)+45]
solve(moment==0,q0)
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Walter Roberson
il 30 Apr 2022
I do not recall whether the interface to maple supports using sym that way to create a vector. Maybe?
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