To create two-dimensional line plots, use the plot function. For example, plot the value of the sine function from 0 to :
x = 0:pi/100:2*pi; y = sin(x); plot(x,y)
You can label the axes and add a title.
xlabel('x') ylabel('sin(x)') title('Plot of the Sine Function')
By adding a third input argument to the plot function, you can plot the same variables using a red dashed line.
The 'r--' string is a line specification. Each specification can include characters for the line color, style, and marker. A marker is a symbol that appears at each plotted data point, such as a +, o, or *. For example, 'g:*' requests a dotted green line with * markers.
Notice that the titles and labels that you defined for the first plot are no longer in the current figure window. By default, MATLAB® clears the figure each time you call a plotting function, resetting the axes and other elements to prepare the new plot.
To add plots to an existing figure, use hold.
x = 0:pi/100:2*pi; y = sin(x); plot(x,y) hold on y2 = cos(x); plot(x,y2,':') legend('sin','cos')
Until you use hold off or close the window, all plots appear in the current figure window.