0 个投票

hi i have a problem with solve:
syms t1 t2 t3 t4 t5 t6
eqns = (-0.7591*t1+0.3789*t2 == -38.689,0.3789*t1-0.7591*t2+0.3789*t3 == -0.799 , 0.3789*t2-0.7591*t3+0.3789*t4 ==-0.799,0.3789*t3-0.7591*t4+0.3789*t5 == -0.799,0.3789*t4-0.7591*t5+0.3789*t6 == -0.799,0.3789*t5-0.3802*t6 == -0.0412 );
S = solve(eqns,[t1 t2 t3 t4 t5 t6])
but it give me this error:
Invalid expression. When calling a function or indexing a variable, use parentheses.
Otherwise, check for mismatched delimiters.
what can i do to solve it?

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Ameer Hamza
Ameer Hamza 2020-12-26

1 个投票

Use square brackets instead of parenthesis in the definition of eqns
syms t1 t2 t3 t4 t5 t6
eqns = [-0.7591*t1+0.3789*t2 == -38.689, 0.3789*t1-0.7591*t2+0.3789*t3 == -0.799 , 0.3789*t2-0.7591*t3+0.3789*t4 ==-0.799,0.3789*t3-0.7591*t4+0.3789*t5 == -0.799,0.3789*t4-0.7591*t5+0.3789*t6 == -0.799,0.3789*t5-0.3802*t6 == -0.0412 ];
%^ use this
S = solve(eqns,[t1 t2 t3 t4 t5 t6])

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arsalan mehrabi
arsalan mehrabi 2020-12-26
thanks man but what was the problem?
Ameer Hamza
Ameer Hamza 2020-12-26
The parenthesis is not used to create vectors in MATLAB. They are used for indexing or passing arguments to a function. Square brackets are used to create vectors.
Ameer Hamza
Ameer Hamza 2020-12-27
I am glad to be of help!

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