This example shows how to create a graph with two y-axes, label the axes, and display the grid lines.
Create and Plot Data
Create the data.
A = 1000; a = 0.005; b = 0.005; t = 0:900; z1 = A*exp(-a*t); z2 = sin(b*t);
plotyy to create a graph with two y-axes. Plot
t using semilogarithmic scaling. Plot
t using linear scaling. Return the two axes in array
ax, and return the two lines as
[ax,p1,p2] = plotyy(t,z1,t,z2,'semilogy','plot');
The left y-axis corresponds to the first set of data plotted, which is the semilogarithmic plot for
z1. The first axes,
ax(1), and the line,
p1, correspond to the first set of data.
The right y-axis corresponds to the second set of data plotted, which is the line plot for
z2. The second axes,
ax(2), and the line,
p2, correspond to the second set of data.
Label the Axes
Label the left y-axis by passing the first axes to the
ylabel function. Then, label the right y-axis by passing the second axes to the
ylabel function. Label the x-axis using either axes.
ylabel(ax(1),'Semilog Plot') % label left y-axis ylabel(ax(2),'Linear Plot') % label right y-axis xlabel(ax(2),'Time') % label x-axis
Modify Line Appearance
Change the appearance of the lines. Starting in R2014b, you can use dot notation to set properties. If you are using an earlier release, use the
set function instead.
p1.LineStyle = '--'; p1.LineWidth = 2; p2.LineWidth = 2;
Display Grid Lines
Display the log grid associated with the left y-axis by passing the first axes to the
To display the linear grid associated with the right y-axis instead, use