MATLAB Data Import and Visualization 2

Question 1

Which MATLAB function reads a delimited text file and returns a table?

Accepted Answer

readtable

Answer

readtable reads delimited text files (CSV, TSV, etc.) and returns a MATLAB table object with column names detected automatically.

Question 2

What does the MATLAB function 'importdata' return when loading a CSV file with a header row?

Accepted Answer

A struct with fields 'data', 'textdata', and 'colheaders'

Answer

importdata returns a struct containing numeric data in 'data', text content in 'textdata', and column headers in 'colheaders' when the file has mixed content.

Question 3

Which colormap in MATLAB transitions from blue through green to yellow to red?

Accepted Answer

jet

Answer

The 'jet' colormap is the classic rainbow colormap that transitions blue → cyan → green → yellow → red.

Question 4

What is the purpose of the 'hold on' command in MATLAB?

Accepted Answer

Retains the current plot so subsequent plots are added to it

Answer

'hold on' prevents the current axes from being cleared when a new plot command is executed, allowing multiple datasets on one axes.

Question 5

Which function creates a histogram in MATLAB?

Accepted Answer

histogram

Answer

The 'histogram' function (introduced in R2014b) creates histograms with automatic bin selection and returns a Histogram object, superseding the older 'hist' function.

MATLAB - MATLAB Technical Computing Practice Test

MATLAB - MATLAB Technical Computing Practice Test

MATLAB Data Import and Visualization 2