EENG 1910: Project I – Introduction to Electrical Engineering

Assignment-9

To copy the resulting figures in the problems below to Word,

Click Edit on the figure window, then Copy Figure and paste into

your Word document.

Problem-1: Plotting in Different Figure Windows

Plot sin(x) for x values ranging from 0 to 2? (use the linspace

function or column operator) in two separate figure windows (Use

figure(1), figure(2))

– using 10 points in this range – using 100 points in this range

Annotate your figures and provide an explanation of the

difference observed in the two figures.

Problem-2: Subplot

Use subplot to show the difference between the sin and cos

functions. Create an x vector with 100 linearly spaced points in

the range from –2? to 2?, and then two y vectors (y1 and y2) for

sin(x) and cos(x). In a 2×1 subplot, use the plot function to

display them, with appropriate titles.

Problem-3: Plotting, Labelling, Hold On/Off

Plot ?? = exp(??) in the interval [-3, 3] using a solid line. Now

plot a linear approximation of ???? (i.e. ?? = ??) using a dashed line with a square marker in a different color and a quadratic

approximation of ???? (i.e. ?? = 1 + ?? + ??2

2 ) using a dotted line and a

circle marker in another color. Title the plot “Plots of

Approximations of exp(??).” Label the y-axis as “Approximations

of exp(??)” and the x-axis as “??”. Use legend to appropriately identify the plotted lines. Set axes limits to [-3, 3, -5, 15].

Note: Make sure to define ?? with sufficient data points to avoid obtaining choppy curves. Use hold on/hold off to obtain the

three curves on the same figure.

Problem-4: Bar Chart, Histogram, Subplot

Let the vector

Grades = [68, 83, 61, 100, 80, 95, 45, 100, 70, 75, 82, 57, 5,

76, 85, 62, 71, 96, 78, 76, 68, 72, 75, 83, 87, 89, 99, 93, 100,

100, 80, 96, 100, 98, 45, 96, 89, 86, 99, 90, 70]

represent the distribution of final grades in an engineering

course.

a. Use MATLAB to sort (sort) the grades. Then, using the subplot

function subdivide the figure window into two rows and one

column that shows the following: