Reading text files (readtable, textscan) in MATLAB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to read a table from 'data.csv' using readtable.

MATLAB

T = [1]('data.csv');

Drag options to blanks, or click blank then click option'

Areadtable

Btextscan

Cfopen

Dload

Attempts:

3 left

💡 Hint

Common Mistakes

Using fopen instead of readtable

Using load which is for MAT-files

The readtable function reads data from a file into a table.

2fill in blank

medium

Complete the code to open a text file named 'file.txt' for reading.

MATLAB

fid = [1]('file.txt', 'r');

Drag options to blanks, or click blank then click option'

Areadtable

Bfopen

Ctextscan

Dfclose

Attempts:

3 left

💡 Hint

Common Mistakes

Using readtable which reads tables, not opening files

Using fclose which closes files

fopen opens a file and returns a file identifier for reading or writing.

3fill in blank

hard

Fix the error in the code to read numeric data from a file using textscan.

MATLAB

fid = fopen('numbers.txt', 'r');
data = [1](fid, '%f');
fclose(fid);

Drag options to blanks, or click blank then click option'

Atextscan

Bfopen

Creadtable

Dfclose

Attempts:

3 left

💡 Hint

Common Mistakes

Using fopen instead of textscan to read data

Using readtable which reads tables, not formatted data

textscan reads formatted data from an open file identified by fid.

4fill in blank

hard

Fill both blanks to read a CSV file with headers and convert it to a table.

MATLAB

opts = detectImportOptions('data.csv');
opts.[1] = 1;
T = [2]('data.csv', opts);

Drag options to blanks, or click blank then click option'

AVariableNamesLine

Breadtable

CDelimiter

Dtextscan

Attempts:

3 left

💡 Hint

Common Mistakes

Using textscan instead of readtable for tables

Setting Delimiter instead of VariableNamesLine

Setting VariableNamesLine to 1 tells MATLAB to use the first line as headers. Then readtable reads the file using these options.

5fill in blank

hard

Fill all three blanks to read a file line by line using textscan and close it.

MATLAB

fid = [1]('log.txt', 'r');
data = [2](fid, '%s', 'Delimiter', '\n');
[3](fid);

Drag options to blanks, or click blank then click option'

Afopen

Btextscan

Cfclose

Dreadtable

Attempts:

3 left

💡 Hint

Common Mistakes

Using readtable instead of fopen or fclose

Not closing the file after reading

First, open the file with fopen. Then read lines as strings with textscan. Finally, close the file with fclose.