【Advanced】MATLAB 2D Plotting, Adjustment, and Annotation

# Quick Start Tutorial Collection for MATLAB Learning

## 2.1 Setting and Modification of Graph Attributes

### 2.1.1 Line Style, Color, and Markers

MATLAB offers a rich array of graph attributes, allowing users to customize the appearance and style of their graphs. Among these, line style, color, and markers are three of the most commonly used properties.

- **Line Style:** Specifies the type of line, such as solid, dashed, dotted, etc. The `LineStyle` property is used for setting, for example:

plot(x, y, 'LineStyle', '--');   % Dashed line

- **Color:** Specifies the color of the line or markers. The `Color` property is used for setting, and colors can be specified by name, RGB values, or hexadecimal codes, for example:

plot(x, y, 'Color', 'blue');   % Blue

- **Markers:** Specifies the type of marker displayed at data points, such as circles, squares, stars, etc. The `Marker` property is used for setting, for example:

plot(x, y, 'Marker', 'o');   % Circle

## 2. MATLAB 2D Plotting Tips

### 2.1 Setting and Modification of Graph Attributes

#### 2.1.1 Line Style, Color, and Markers

MATLAB provides a rich set of graph attributes for setting and modifying the appearance of graphs. Among these, line style, color, and markers are commonly used properties that control the style and color of lines and points.

- **Line Style:** Used to specify the style of lines, such as solid, dashed, dotted, etc. The `linestyle` property can be set, and its values can be `'-'` (solid), `'--'` (dashed), `'-.'` (dash-dot), etc.

% Set the line to dashed
plot(x, y, '--');

- **Color:** Used to specify the color of the line or markers. The `color` property can be set, and its values can be color names (like `'red'`, `'blue'`), RGB values (like `[1 0 0]` for red), or HEX values (like `'#FF0000'` for red).

% Set the line to blue
plot(x, y, 'b');

- **Markers:** Used to specify the marker style for data points, such as circles, squares, triangles, etc. The `marker` property can be set, and its values can be `'o'` (circle), `'s'` (square), `'^'` (triangle), etc.

% Set data points to triangle markers
plot(x, y, '^');

#### 2.1.2 Coordinate Axes and Legends

Coordinate axes and legends are important elements of a graph, used to display the data range and provide legend information.

- **Coordinate Axes:** Used to display the data range and scales. The `xlabel()`, `ylabel()`, and `title()` functions can be used to set the axis labels and titles.

% Set the x-axis label to "Time"
xlabel('Time');

- **Legends:** Used to display the meaning of different lines or markers in the graph. The `legend()` function can be used to create a legend, with the parameters being the labels for the lines or markers.

% Create a legend showing the labels of lines
legend('Data1', 'Data2');

### 2.2 Processing and Transformation of Graph Data

#### 2.2.1 Data Import and Export

MATLAB provides various methods for importing and exporting graph data.

- **Importing Data:** The `importdata()` function can be used to import data from files (such as CSV, TXT) or databases.

% Import data from a CSV file
data = importdata('data.csv');

- **Exporting Data:** The `exportdata()` function can be used to export data to files or databases.

% Export data to a CSV file
exportdata(data, 'data.csv');

#### 2.2.2 D