# Documentation

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## Combining Different Visualizations

This example shows how to create complex visualizations using multiple chart types or using overlays of the same chart type.

You can create many types of plots using MATLAB®. You also can combine plot types to make interesting visualizations.

### Create a Line Plot with Confidence Bounds

Create a plot with confidence bounds using the `fill` function to draw the confidence bounds and the `plot` function to draw the data points. Use dot notation syntax `object.PropertyName` to customize the look of the fill plot.

```x = 0:0.2:10; % create data for the line plot y = besselj(0, x); xconf = [x x(end:-1:1)] ; % create data for the confidence bounds yconf = [y+0.15 y(end:-1:1)-0.15]; figure fi = fill(xconf,yconf,'red'); fi.FaceColor = [1 0.8 0.8]; % make the filled area pink fi.EdgeColor = 'none'; % remove the line around the filled area hold on plot(x,y,'ro') hold off```

### Add Error Bars to a Bar Chart

Create a bar chart with error bars by using the `bar` and `errorbar` functions together.

```data = [37.6 24.5 14.6 18.1 19.5 8.1 28.5 7.9 3.3 4.1 7.9 1.9 4.3]'; errhigh = [2.1 4.4 0.4 3.3 2.5 0.4 1.6 0.8 0.6 0.8 2.2 0.9 1.5]; errlow = [4.4 2.4 2.3 0.5 1.6 1.5 4.5 1.5 0.4 1.2 1.3 0.8 1.9]; bar(data, 'FaceColor', 'cyan') % create the bar chart hold on er = errorbar(1:13, data, errlow, errhigh); % create the error bars er.Color = [0 0 0]; % make the errorbars black er.LineStyle = 'none'; % remove the line connecting the errorbars hold off```

### Create a Contour Plot with Vector Lines

Use the `contourf` function with the `quiver` function to produce a contour plot with vector lines.

```x = -3:.2:3; y = -3:.2:3; [X,Y] = meshgrid(x,y); % create a grid of X and Y points z = peaks(X,Y); % use peaks to create a 3-D surface [c,h] = contourf(x,y,z); % draw a contour plot axis([-3 3 -3 3]) hold on [px,py] = gradient(z); % calculate the gradient at each point quiver(x,y,px,py,2,'k') % draw a quiver plot of the gradients hold off```

### Change the Color of a Single Bar

You can create a bar chart where one bar is highlighted in a different color by splitting the data and creating two overlapping bar charts.

For example, create a bar chart where the seventh bar is red. First, create a bar chart and replace the data for the seventh bar with `NaN`. Then, overlay a second bar chart in red using only the data for the seventh bar.

```data = [37.6 24.5 14.6 18.1 19.5 8.1 28.5 7.9 3.3 4.1 7.9 1.9 4.3]'; data1 = data; data1(7) = NaN; bar(data1, 'FaceColor', 'blue') % create the first bar chart in blue hold on data2 = NaN(1,13); data2(7) = data(7); bar(data2, 'FaceColor', 'red') % create the second bar chart in red hold off```

### Create a Contour Plot with Major and Minor Contour Lines

You can create a contour plot with emphasis on selected contour lines by splitting the data and creating two overlapping contour plots.

For example, create a contour plot of the `peaks` function where the even numbered contours lines are solid and the odd numbered contour lines are dotted. Plot one contour for the even numbered levels. Then, overlay a second contour plot with the odd numbered levels drawn with a dotted line.

```major = -6:2:8; minor = -5:2:7; [cmajor,hmajor] = contour(peaks,'LevelList',major); % contour with major (even-numbered) levels clabel(cmajor,hmajor) % label the major levels hold on [cminor,hminor] = contour(peaks,'LevelList',minor); % contour with minor (odd-numbered) levels hminor.LineStyle = ':'; % make the minor levels dotted hold off```