Problem with solve command

2016 3 8
1 个回答
更新时间：2016 3 21
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syms Ax Ay Dx Dy Md F M R
syms a b c tht
% slotted arm
A = [0,0,0]; B = [a*cos(tht),a*sin(tht),0];
rAB = B-A;
FA = [Ax,Ay,0]; MA = [0,0,-M]; FR = [R*sin(tht),-R*cos(tht),0];
sumF = FA + FR
sumMA = MA + cross(rAB,FR)
sol1 = solve(sumF(1),sumF(2),sumMA(3),Ax,Ay,R)

3 个评论
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John D'Errico
John D'Errico 2016-3-9
What is the problem? Did it give an error? If so, then report the error. Did it give a result that you think to be suspect? Why do you think so? Tell us what you think is wrong.
Panchapakesan Venkataraman
编辑：Walter Roberson 2016-3-9
I apologize:
I have this error:
Error using mupadengine/feval (line 157)
MuPAD error: Error: Invalid variable to solve for. [solve]
Error in solve (line 170)
sol = eng.feval('symobj::solvefull',eqns,vars);
Error in Ex_6_8_Frame2Dm (line 23)
sol1 = solve(sumF(1),sumF(2),sumMA(3),Ax,Ay,R)
In my previous use of solve it would return a solution in terms of the other variables, that is M and a.
I cannot find the error and I have searched on the internet. I am using ver 2014a.
Thanks
Venkat
Sarah Palfreyman
Sarah Palfreyman 2016-3-21
编辑：Sarah Palfreyman 2016-3-21
It seems fine in the Live Editor in R2016a. If you are having an issue please do contact Technical Support at support@mathworks.com

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