Why the syms command is not working on my matlab?

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Elie Saikaly
Elie Saikaly 2013-9-14
评论： Walter Roberson 2024-2-27
when entering the syms command to define variables, an error occurs that says undefined function.

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Walter Roberson
Walter Roberson 2013-9-14
syms is part of the Symbolic Toolbox. The Symbolic Toolbox is an optional, extra-cost toolbox for the Academic license and the Professional license. The Symbolic Toolbox is included in the Student Version, but it is not installed by default.
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Abdelqader
Abdelqader 2024-2-27
编辑：Walter Roberson 2024-2-27
how i answer this question in mat lab
Solve the following system of simultaneous equations for x:
-2.0 x1 + 5.0 x2 + 2.0 x3 + 3.0 x4 + 4.0 x5 - 1.0 x6 = -3.0
2.0 x1 - 1.0 x2 - 5.0 x3 - 2.0 x4 + 6.0 x5 + 4.0 x6 = 1.0
-1.0 x1 + 6.0 x2 - 4.0 x3 - 5.0 x4 + 3.0 x5 - 1.0 x6 = -6.0
4.0 x1 + 3.0 x2 - 6.0 x3 - 5.0 x4 - 2.0 x5 - 2.0 x6 = 10.0
-3.0 x1 + 6.0 x2 + 4.0 x3 + 2.0 x4 - 5.0 x5 + 4.0 x6 = -6.0
2.0 x1 + 4.0 x2 + 4.0 x3 + 4.0 x4 + 5.0 x5 - 4.0 x6 = -2.0
Walter Roberson
Walter Roberson 2024-2-27
Ran in:
syms x1 x2 x3 x4 x5 x6
eqns = [
-2.0*x1 + 5.0*x2 + 2.0*x3 + 3.0*x4 + 4.0*x5 - 1.0*x6 == -3.0
2.0*x1 - 1.0*x2 - 5.0*x3 - 2.0*x4 + 6.0*x5 + 4.0*x6 == 1.0
-1.0*x1 + 6.0*x2 - 4.0*x3 - 5.0*x4 + 3.0*x5 - 1.0*x6 == -6.0
4.0*x1 + 3.0*x2 - 6.0*x3 - 5.0*x4 - 2.0*x5 - 2.0*x6 == 10.0
-3.0*x1 + 6.0*x2 + 4.0*x3 + 2.0*x4 - 5.0*x5 + 4.0*x6 == -6.0
2.0*x1 + 4.0*x2 + 4.0*x3 + 4.0*x4 + 5.0*x5 - 4.0*x6 == -2.0]
eqns = 
[A,b] = equationsToMatrix(eqns)
A = 
b = 
A\b
ans = 

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