MATLAB: How to color RED to the lower portion of the curve

plot

How to color RED to the lower portion of the curve y=x^2

x = 1 : 0.1 : 10;
y = x.^2;
plot(x,y)
axis([1 10 0 100])

Best Answer

Replace the

plot(x,y)

command with

area(x,y,'FaceColor',[1 0 0])

Related Solutions

MATLAB: How to fill a plot section from a single x,y coordinates

I would fill it with a patch object.

line([1 1],[0 100],'color','b','linewidth',3);
hold all
verts = [[0;1;1;0],[0;0;100;100]];
faces = [1 2 3 4];
cdata = [1 0 0];
p = patch('Faces',faces,'Vertices',verts,'FaceColor','flat',...
          'FaceVertexCData',cdata,'edgecolor','none');
axis([0 2 0 100])

In the same way, you can make patch out of polygons by specifying the values in the verts array. Column 1 is the x-coord and column two is the y-coord of the vertices of the polygon.

MATLAB: How to normalize curves such that area under curve=1

divide all numbers by the area that you calculate using Trapz.

x=0:0.1:pi;
y=sin(x);
Area=trapz(x,y)
Area =
      1.9975
y_normalized=y./Area;
trapz(x, y_normalized)
ans =
      1.0000

Best Answer

Related Solutions

MATLAB: How to fill a plot section from a single x,y coordinates

MATLAB: How to normalize curves such that area under curve=1

Related Question