MATLAB Data Import and Visualization 5

Question 1

Which MATLAB function reads a JSON file and converts it to a MATLAB structure?

Accepted Answer

jsondecode(fileread('data.json'))

Answer

MATLAB has no single jsonread function; the standard pattern is fileread() to get the raw text then jsondecode() to parse it into a struct.

Question 2

What does 'subplot(2,2,3)' specify in MATLAB?

Accepted Answer

The axes in the bottom-left position of a 2x2 grid

Answer

subplot(m,n,p) selects axes number p in an m-by-n grid; positions are numbered left-to-right, top-to-bottom, so position 3 is bottom-left in a 2x2 grid.

Question 3

What is the purpose of 'detectImportOptions' in MATLAB?

Accepted Answer

Automatically detects and returns configurable import options for a file

Answer

detectImportOptions inspects a file and returns an ImportOptions object pre-configured for that file, which you can then modify before passing to readtable or readmatrix.

Question 4

Which property of a MATLAB line object controls the thickness of the plotted line?

Accepted Answer

LineWidth

Answer

The LineWidth property (in points) controls the rendered thickness of line and marker edge strokes on a MATLAB plot object.

Question 5

What does 'yyaxis right' do in MATLAB?

Accepted Answer

Activates the right y-axis so subsequent plot commands use it

Answer

yyaxis right switches the active y-axis to the right side; subsequent plot commands will be associated with the right y-axis scale.

MATLAB - MATLAB Technical Computing Practice Test

MATLAB - MATLAB Technical Computing Practice Test

MATLAB Data Import and Visualization 5