This example shows how to create a chart with *y*-axes on the left and right sides using the `yyaxis`

function. It also shows how to label each axis, combine multiple plots, and clear the plots associated with one or both of the sides.

Create axes with a *y*-axis on the left and right sides. The `yyaxis left`

command creates the axes and activates the left side. Subsequent graphics functions, such as `plot`

, target the active side. Plot data against the left *y*-axis.

```
x = linspace(0,25);
y1 = sin(x/2);
yyaxis left
plot(x,y1);
```

Activate the right side using `yyaxis right`

. Then plot a set of data against the right *y*-axis.

```
z1 = x.^2/2;
yyaxis right
plot(x,z1);
```

Control which side of the axes is active using the `yyaxis left`

and `yyaxis right`

commands. Then, add a title and axis labels.

yyaxis left title('Plots with Different y-Scales') xlabel('Values from 0 to 25') ylabel('Left Side') yyaxis right ylabel('Right Side')

Add two more lines to the left side using the `hold on`

command. Add an errorbar to the right side. The new plots use the same color as the corresponding *y*-axis and cycle through the line style order. The `hold on`

command affects both the left and right sides.

hold on yyaxis left y2 = sin(x/3); plot(x,y2); y3 = sin(x/4); plot(x,y3); yyaxis right load count.dat; m = mean(count,2); e = std(count,1,2); errorbar(m,e) hold off

Clear the data from the right side of the axes by first making it active, and then using the `cla`

command.

```
yyaxis right
cla
```

Clear the entire axes and remove the right *y*-axis using `cla reset`

.

```
cla reset
```

Now when you create a plot, it only has one *y*-axis. For example, plot three lines against the single y-axis.

xx = linspace(0,25); yy1 = sin(x/4); yy2 = sin(x/5); yy3 = sin(x/6); plot(xx,yy1,xx,yy2,xx,yy3)

Add a second *y*-axis to an existing chart using `yyaxis`

. The existing plots and the left *y*-axis do not change colors. The right *y*-axis uses the next color in the axes color order. New plots added to the axes use the same color as the corresponding *y*-axis.

```
yyaxis right
zz1 = exp(xx/6);
zz2 = exp(xx/8);
plot(xx,zz1,xx,zz2)
```

`cla`

| `hold`

| `plot`

| `title`

| `xlabel`

| `ylabel`

| `yyaxis`

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