clear; close all; clc; format shortg;
%This chapter is all about plotting
%Three main commands, plot(), fplot(), and polar()
%plot:
%plots the points of vectors and connects the dots
x1 = [0:5]; y1 = 2*x1; y2 = 3*x1;
plot(x1,y1,'--rd'); %Plots our function as a dashed red line
%with the points marked as diamonds
%Play around with the options found on page 136-137
%You can use plot to plot two functions.
figure; %Opens a new figure window
plot(x1,y1,x1,y2);
%Be careful with how close your points are
x3 = [0:2*pi]; y3 = sin(x3);
x4 = [0:.1:2*pi]; y4 = sin(x4);
figure;
plot(x3,y3,x4,y4);
%Sometimes you'll want to plot one function in different pieces
%For example if you have an asymptote
%How to plot multiple functions on one graph
%2 ways, plot command and hold on ... hold off
x5 = [-2:.01:-1.01]; x6 = [-.99:.01:1]; %notice I avoid x = -1
y5 = 1./(1+x5); y6 = 1./(1+x6);
%the asymptote
figure;
plot(x5,y5,x6,y6,'b'); %each new funtion will have a different color
%unless you tell it otherwise
axis([-2 1 -10 10]);
%defines my domain and range on the graph
figure
plot(x5,y5)
axis([-2 1 -10 10])
hold on
plot(x6,y6)
hold off
%tells matlab that I want to add to my graph
%tells matlab I'm done adding to my graph
%fplot
%fplot, plots functions
figure;
fplot('sin(x)',[0 2*pi -2 2],'--g') %you must set the domain and range
%you can also use the line options
%Polar
%plots polar coordinates
theta = [0:.1:2*pi]; r = 1 + cos(theta);
figure;
polar(theta,r);
%Formatting
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%xlabel('x axis label goes here'), labels the x axis
%ylabel('y axis label goes here'), labels the y axis
%title('title goes here'), places a title
%axis([xmin xmax ymin ymax]), sets the limits of the graph
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Published with MATLAB® R2014a
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