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How to plot 2D Linear Inequality?

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Omar B.
Omar B. 2021-9-17
评论： Omar B. 2021-9-17
How to plot cond1 and cond2 with the cost in one figure?
[x1,x2]=meshgrid(0:.1:10,0:.1:10);
cond1=x1-x2<=-2;
cond2=-0.3*x1-x2<=-8;
cost=0.4*x1.^2-5*x1+x2.^2-6*x2+50;
figure (1)
contour(x1,x2,cost,10,'linewidth',2)
xlabel('x_{1}');
ylabel('x_{2}');
hold on
...

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KSSV
KSSV 2021-9-17
Ran in:
[x1,x2]=meshgrid(0:.1:10,0:.1:10);
cond1=x1-x2<=-2;
cond2=-0.3*x1-x2<=-8;
cost=0.4*x1.^2-5*x1+x2.^2-6*x2+50;
figure (1)
contour(x1,x2,cost,10,'linewidth',2)
hold on
contour(x1,x2,cond1,'color','k','linewidth',2)
contour(x1,x2,cond2,'color','r','linewidth',2)
xlabel('x_{1}');
ylabel('x_{2}');
hold on
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KSSV
KSSV 2021-9-17
Coordinates of contour lines are obtained. Those are c1, c2. These coordinates are row arrays. c1(1,:) means first row which is x -coordinate and c1(2,:) is second row which is y-coordinate.

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