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Matrix problems with 3D plots
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Given the following system of linear equations,
-3a + b -c +d + e = 0
b + c + 4e = 0
-3c + 2d + e = 0
Please use MATLAB to do the following:
Use rref command to find the general solution, express all unknowns with two variables s and t;
Plot 3-D figures to show all unknowns as functions of -1<s<1 and -1<t<1;
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Sara Hafeez
el 30 de Nov. de 2012
>> A= [-3 1 -1 1 1; 0 1 1 0 4; 0 0 -3 2 1]
A =
-3 1 -1 1 1
0 1 1 0 4
0 0 -3 2 1
>> [R,jb] = rref(A)
R =
1.0000 0 0 0.1111 1.2222
0 1.0000 0 0.6667 4.3333
0 0 1.0000 -0.6667 -0.3333
jb =
1 2 3
[R,jb] = rref(A) also returns a vector jb such that:
*
r = length(jb) is this algorithm's idea of the rank of A.
*
x(jb) are the pivot variables in a linear system Ax = b.
*
A(:,jb) is a basis for the range of A.
*
R(1:r,jb) is the r-by-r identity matrix. if true
% code
end
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