MATLAB 2D and 3D Plotting 4

Question 1

Which MATLAB function creates a stem plot (discrete sequence plot)?

Accepted Answer

stem

Answer

stem(x,y) plots data as vertical lines (stems) topped with markers, commonly used to visualize discrete-time signals.

Question 2

How do you rotate a 3D plot interactively in MATLAB's figure window?

Accepted Answer

Use the 'rotate3d on' command or the Rotate 3D toolbar button

Answer

'rotate3d on' enables interactive 3D rotation so you can click and drag the plot to view it from different angles.

Question 3

What does 'caxis([0 100])' do in MATLAB?

Accepted Answer

Sets the color data limits used by the colormap to map values 0–100

Answer

caxis([cmin cmax]) sets the color axis scaling so that the colormap spans the data range from cmin to cmax.

Question 4

Which MATLAB function is used to add a secondary y-axis on the right side of a plot?

Accepted Answer

yyaxis right

Answer

yyaxis right activates the right y-axis so subsequent plots are drawn against it while sharing the same x-axis.

Question 5

In MATLAB, what is the difference between 'plot(x,y)' and 'fplot(@(x) sin(x), [0 pi])'?

Accepted Answer

fplot adaptively samples the function for accuracy while plot uses fixed x-spacing

Answer

fplot adaptively samples the function at more points in rapidly changing regions to produce a smoother and more accurate curve, unlike plot which uses fixed spacing.

MATLAB - MATLAB Technical Computing Practice Test

MATLAB - MATLAB Technical Computing Practice Test

MATLAB 2D and 3D Plotting 4