String Functions in MATLAB

🔤 String Functions in MATLAB

Modern MATLAB encourages using string arrays ("text") instead of character arrays ('text').
MATLAB is developed by MathWorks.

🔹 String vs Character Array (Quick)

1️⃣ Creating Strings

Create from char:

2️⃣ Length & Size

Output

3️⃣ Concatenation

🔸 + operator (recommended)

Output

🔸 strcat()

4️⃣ Change Case

Output

5️⃣ Comparison

Output

6️⃣ Search & Match

🔸 contains()

Output

🔸 startsWith() / endsWith()

7️⃣ Replace Text

Output

8️⃣ Split & Join

🔸 split()

Output

🔸 join()

Output

9️⃣ Trim Spaces

Output

🔟 Convert Between Types

Output

1️⃣1️⃣ Formatting Strings

Output

1️⃣2️⃣ String Arrays

Output

⚠️ Important Notes

• Prefer string arrays (" ") over char arrays

• Many functions are vectorized for string arrays

• Use sprintf for formatted messages

• contains, replace, split are exam favorites

🎯 Interview Questions: String Functions in MATLAB

🔹 Q1. Difference between string and char?

Answer:
Strings use double quotes and support richer functions; chars use single quotes.

🔹 Q2. How do you concatenate strings?

Answer:
Using + or strcat().

🔹 Q3. Which function checks substring existence?

Answer:
contains().

🔹 Q4. How do you split a string?

Answer:
Using split().

🔹 Q5. How do you format strings with values?

Answer:
Using sprintf().

🔹 Q6. How do you convert string to number?

Answer:
str2double().

✅ Summary

• String functions handle text efficiently

• Use " " (string) instead of ' ' (char)

• Support searching, replacing, splitting, formatting

• Essential for file I/O, labels, and reports