2D Plot in MATLAB

📈 2D Plot in MATLAB

It is one of the most common tools for data analysis, engineering, and scientific visualization.
MATLAB is developed by MathWorks.

🔹 What Is a 2D Plot?

A 2D plot displays:

• X-axis → independent variable

• Y-axis → dependent variable

Created mainly using the plot() function.

1️⃣ Basic 2D Plot

🔸 Syntax

A graph of y = x² 📈

2️⃣ 2D Plot with Labels & Title

Output:
A labeled sine wave.

3️⃣ Plot Multiple Lines on Same Graph

Output:
Sine and cosine curves on the same plot.

4️⃣ Changing Line Style, Color & Marker

📌 Meaning of 'r--o':

• r → red color

• -- → dashed line

• o → circle marker

5️⃣ Grid on 2D Plot

6️⃣ Plot Using hold on

📌 Plots multiple graphs without erasing previous one.

7️⃣ Axis Control

8️⃣ Complete Example

⚠️ Important Notes

• plot() creates a 2D line graph

• Use .^, .*, ./ for vector math

• Always label axes for clarity

• Use legend() when plotting multiple lines

🎯 Interview Questions: 2D Plot in MATLAB

🔹 Q1. Which function is used to create a 2D plot?

Answer: plot()

🔹 Q2. How do you label X and Y axes?

Answer: Using xlabel() and ylabel().

🔹 Q3. How do you plot multiple lines on one graph?

Answer:
Using plot(x1,y1,x2,y2) or hold on.

🔹 Q4. What does grid on do?

Answer:
Displays grid lines on the plot.

🔹 Q5. Which operator is used for element-wise square?

Answer: .^

🔹 Q6. How do you add a legend?

Answer:
Using legend().

🔹 Q7. How do you change line color and style?

Answer:
Using format strings like 'r--o'.

✅ Summary

• 2D plots visualize X–Y data

• Created using plot()

• Supports labels, legends, grid, styles

• Essential for data visualization