I keep getting the error message that the variables must be of data type double and it is currently of type sym.

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Ana
Ana 2024-2-21
评论： Ana 2024-2-21
Ran in:
%I'm unsure how else to run this code to solve the 10 eqn system where
%the answer comes out in the correct form, please help
syms AB BC AD BD CD DE CE Ax Ay Ey
eqn1=Ax+AD==0;
eqn2=Ay+AB==0;
eqn3=74+BC+(3/5)*BD==0;
eqn4=-AB-(4/5)*BD==0;
eqn5=-BC+(3/5)*CE==0;
eqn6=-24-CD-(4/5)*CE==0;
eqn7=-AD+DE-(3/5)*BD==0;
eqn8=CD+(4/5)*BD==0;
eqn9=-DE-(3/5)*CE==0;
eqn10=Ey+(4/5)*CE==0;
[AB BC AD BD CD DE CE Ax Ay Ey]=solve(eqn1, eqn2, eqn3, eqn4, eqn5, eqn6, eqn7, eqn8, eqn9, eqn10,[AB BC AD BD CD DE CE Ax Ay Ey])
AB = 
BC = 
AD = 
74
BD = 
CD = 
DE = 
46
CE = 
Ax = 
Ay = 
Ey = 
  2 个评论
Ana
Ana 2024-2-21
it is still giving me these error messages
"Variable AB must be of data type double. It is currently of type sym. Check where the variable is assigned a value."
is it because I introduce them using 'syms', it also said i cannot use rehash in my code on Matlab Grader

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采纳的回答

Walter Roberson
Walter Roberson 2024-2-21
%I'm unsure how else to run this code to solve the 10 eqn system where
%the answer comes out in the correct form, please help
syms AB BC AD BD CD DE CE Ax Ay Ey
eqn1=Ax+AD==0;
eqn2=Ay+AB==0;
eqn3=74+BC+(3/5)*BD==0;
eqn4=-AB-(4/5)*BD==0;
eqn5=-BC+(3/5)*CE==0;
eqn6=-24-CD-(4/5)*CE==0;
eqn7=-AD+DE-(3/5)*BD==0;
eqn8=CD+(4/5)*BD==0;
eqn9=-DE-(3/5)*CE==0;
eqn10=Ey+(4/5)*CE==0;
[AB BC AD BD CD DE CE Ax Ay Ey]=solve(eqn1, eqn2, eqn3, eqn4, eqn5, eqn6, eqn7, eqn8, eqn9, eqn10,[AB BC AD BD CD DE CE Ax Ay Ey]);
AB = double(AB);
BC = double(BC);
AD = double(AD);
BD = double(BD);
DE = double(DE);
CE = double(CE);
Ax = double(Ax);
Ay = double(Ay);
Ey = double(Ey);

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