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Assigning values to defined symbolic variables afterwards

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Alexi
Alexi 2022-2-19
评论： Alexi 2022-2-19
syms x ar la
C_I=[((1+(4/3)*ar*sin(x))/8)*la,0,0,0;0,((1-(4/3)*ar*cos(x))/8)*la,0,0; 0,0,((1-(4/3)*ar*sin(x))/8)*la,0; 0,0,0,((1+(4/3)*ar*cos(x))/8)*la];
Lb=[1,-1,cos(x),sin(x);1,1,sin(x),-cos(x);1,-1,-cos(x),-sin(x);1,1,-sin(x),cos(x)];
Lb_1=inv(Lb);
Cm=Lb_1*(2*(diff(Lb,x))+(C_I*Lb));
How can you calculate the Cm matris while x=0 ? What code should I write next?

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Star Strider
Star Strider 2022-2-19
Ran in:
Use the subs funciton (and optionally simplify).
Try this —
syms x ar la
sympref('AbbreviateOutput',false);
C_I=[((1+(4/3)*ar*sin(x))/8)*la,0,0,0;0,((1-(4/3)*ar*cos(x))/8)*la,0,0; 0,0,((1-(4/3)*ar*sin(x))/8)*la,0; 0,0,0,((1+(4/3)*ar*cos(x))/8)*la]
C_I = 
Lb=[1,-1,cos(x),sin(x);1,1,sin(x),-cos(x);1,-1,-cos(x),-sin(x);1,1,-sin(x),cos(x)]
Lb = 
Lb_1=inv(Lb)
Lb_1 = 
Cm=Lb_1*(2*(diff(Lb,x))+(C_I*Lb))
Cm = 
Cm_x0 = subs(Cm,{x},{0}) % Substitute 0 for 'x'
Cm_x0 = 
Cm_x0 = simplify(Cm_x0, 500) % Simplified
Cm_x0 = 
.
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Star Strider
Star Strider 2022-2-19
The μ and γ are new.
How are they defined, especially in the context of the other variables?

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