Lecture 30: Plotting.
---------------------

x =-1:0.1:1

x =

  Columns 1 through 4 

   -1.0000   -0.9000   -0.8000   -0.7000

  Columns 5 through 8 

   -0.6000   -0.5000   -0.4000   -0.3000

  Columns 9 through 12 

   -0.2000   -0.1000         0    0.1000

  Columns 13 through 16 

    0.2000    0.3000    0.4000    0.5000

  Columns 17 through 20 

    0.6000    0.7000    0.8000    0.9000

  Column 21 

    1.0000

f = exp(x)

f =

  Columns 1 through 4 

    0.3679    0.4066    0.4493    0.4966

  Columns 5 through 8 

    0.5488    0.6065    0.6703    0.7408

  Columns 9 through 12 

    0.8187    0.9048    1.0000    1.1052

  Columns 13 through 16 

    1.2214    1.3499    1.4918    1.6487

  Columns 17 through 20 

    1.8221    2.0138    2.2255    2.4596

  Column 21 

    2.7183

;
f = exp(x);
%create the graph of f
plot(x,f)
hold on
g = log(x+2);
openvar('g', g);
plot(x,g,'--');
hold off
plot(x,f,'r+')
plot(x,g,'go')

%plots in polar coordinates
t = 0:0.2:2;
r = t^2-1;
??? Error using ==> ^
Matrix must be square.

r = t.^2-1;
polar(t,r);
hold on
r2 = t./10-1;
polar(t,r2,'g--');

%3d plots
xa = -1:0.1:1;
ya = -1:0.1:1;
[x,y] = meshgrid(xa,ya);
openvar('x', x);
z = cos(x.*y);
mesh(x,y,z);
hold off
mesh(x,y,z);
view(10,20);

%3d plot of a curve 
t = 0:0.1:10*pi;
plot3(cos(t),sin(t),t);

%level curves, "contours"
mesh(x,y,z);
contour(z);
h = contour(z,30);
clabel(h, 'manual');
 
    Please wait a moment...
 
   Carefully select contours for labeling.
   When done, press RETURN while the Graph window is the active window.

%subplots
figure
subplot(2,3,5);
mesh(x,y,z);
subplot(2,3,3);
mesh(x,y,z);
view(10,20);
diary off