plot solution of linear systems (linsolve)

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M03
M03 2018-12-14
评论： Matt J 2018-12-16
Hello.
I am looking for a code that will help me plot a graph of solution of these two linear systems. My codes are the following, however, how can I get a solution into one plot with lines representing solution for each equation?
? +? +? = 2
? +2? −? = 4
−? +2? +? = 2
% LS for A
A = [1 1 1; 1 2 -1; -1 2 1];
a = [2; 4; 2];
linsolve(A,a)
plot ????
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M03
M03 2018-12-14
That's the point. I should make one for the system above.
And if I have a 3x2 system like this, how will the code look like?
+2? +? =
7 ? −2? = 1
−? +5? = 4
Matt J
Matt J 2018-12-16
An equation in 3 unknowns does not define a line, but rather a plane.

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回答（2 个）

madhan ravi
madhan ravi 2018-12-15
编辑：madhan ravi 2018-12-15
doc syms
doc fplot
doc equationsToMatrix
doc linsolve
doc plot % see how to plot a single point especially markers
doc legend
doc xlim
Star Strider
Star Strider 2018-12-15
This was something of a challenge in the format presented.
% % % Equations: -2*x + y = 1; 3*x + 2*y = 10; -15*x + 2*y = -80
X = [-5 1; 10 1]; % Create: [X 1] Matrix
A = [2 1; -3/2 10/2; 15/2 -80/2]; % ‘Solve’ The Equations In ‘y = B1*x + B2’ Form
Y = X * A'; % Solve For ‘Y’
CoefVct = linsolve([A(:,1), ones(size(A(:,1)))], A(:,2));
figure
plot(X(:,1), Y)
Ax = gca;
Ax.YAxisLocation = 'origin';
ylim([0 20])
producing:
CoefVct =
-5.21862348178138
2.58299595141701
and the plot.
The plot appears to be as requested.

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