MATLAB Programming/Graphics
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[edit] 2D Graphics
[edit] Plot
Plots a function in Cartesian Coordinates, x and y.
Example:
x=0:0.1:2; % creates a line vector from 0 to 2 fx=(x+2)./x.^2; % creates fx plot(x,fx,'-ok') % plots 2d graphics of the function fx
To plot 2 or more graphs in one Figure, then simply append the second (x,y) pair to the first:
>>>x1 = [1,2,3,4] >>>y1 = [1,2,3,4] >>>y2 = [4,3,2,1] >>>plot(x1,y1,x1,y2)
This will plot y1 and y2 on the same x-axis in the output.
[edit] Polar Plot
Plots a function using θ and r(θ)
t = 0:.01:2*pi; polar(t,sin(2*t).^2)
[edit] 3D Graphics
[edit] plot3
The "plot3" command is very helpful and easy to see three dimensional images. It follows the same syntax as the "plot" command. If you search the MATlab help (not at the command prompt. Go to the HELP tab at the top of the main bar then type plot3 in the search) you will find all the instruction you need.
Example:
l=[-98.0556 ; 1187.074]; f=[ -33.5448 ; -240.402]; d=[ 1298 ; 1305.5] plot3(l,f,d); grid on;
This example plots a line in 3d. I created this code in an M-file. If you do the same you change the values and hit the run button in the menu bar to see the effect.
[edit] Mesh
Creates a 3D plot using vectors x and y, and a matrix z. If x is n elements long, and y is m elements long, z must be an m by n matrix.
Example:
x=[0:pi/90:2*pi]'; y=x'; z=sin(x*y); mesh(x,y,z);
[edit] Contour
Creates a 2D plot of a 3D projection, using vectors x and y, and a matrix z. If x is n elements long, and y is m elements long, z must be an m by n matrix.
Example:
x=[0:pi/90:2*pi]'; y=x'; z=sin(x*y); contour(x,y,z);
[edit] Contourf
Same as contour, but fills color between contour lines
[edit] Surface
Basically the same as mesh
