How to plot 2D Linear Inequality?
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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
...
采纳的回答
[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
6 个评论
clc; clear all ;
[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;
%% Get cond1 and cond2
c1 = contour(x1,x2,cond1,[1 1],'color','k') ;
idx = c1(2,:)>max(x2(:)) ;
c1(:,idx) = [] ;
p = polyfit(c1(1,:),c1(2,:),1) ;
c1(2,:) = polyval(p,c1(1,:)) ;
%
c2 = contour(x1,x2,cond2,[1 1],'color','k') ;
idx = c2(2,:)>max(x2(:)) ;
c2(:,idx) = [] ;
p = polyfit(c2(1,:),c2(2,:),1) ;
c2(2,:) = polyval(p,c2(1,:)) ;
figure (1)
contour(x1,x2,cost,10,'linewidth',2)
hold on
plot(c1(1,:),c1(2,:),'k','Linewidth',2)
plot(c2(1,:),c2(2,:),'k','LineWidth',2)
xlabel('x_{1}');
ylabel('x_{2}');
Omar B.
2021-9-17
Omar B.
2021-9-17
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.
Omar B.
2021-9-17
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