MATLAB MATLAB String Operations and File I/O 3

Question 1

Which MATLAB function checks if two strings are equal?

Accepted Answer

strcmp

Answer

strcmp returns 1 (true) if two strings are identical and is case-sensitive, unlike strcmpi which ignores case.

Question 2

What does `regexp(str, pattern)` return in MATLAB?

Accepted Answer

Starting indices of matches of the regular expression pattern in str

Answer

regexp returns a vector of starting indices where the regular expression pattern matches within the input string.

Question 3

How do you close a file in MATLAB after using fopen?

Accepted Answer

fclose(fid)

Answer

fclose closes the file associated with the given file identifier and returns 0 on success.

Question 4

What function imports data from a space-delimited text file into a matrix in MATLAB?

Accepted Answer

All of the above can work

Answer

MATLAB provides multiple ways to load text data: load for simple ASCII files, dlmread for delimited files, and readmatrix as the modern replacement.

Question 5

What does `sprintf('%05.2f', 3.7)` return in MATLAB?

Accepted Answer

'03.70'

Answer

The format '%05.2f' means total width 5, 2 decimal places, zero-padded, producing '03.70' for the value 3.7.

MATLAB - MATLAB Technical Computing Practice Test