HW2_ENED1090_AUTUMN_2016(1).docx - Homework#2 ENED 1090...

Homework #2
ENED 1090: Engineering Models I
Homework Assignment #2
Due: Week of September 12
th
at the beginning of your Recitation Section
Instructions:
1. In addition to this HW2 document, you will also need the excel file posted with HW2:
HydrogenPeroxide.xlsx. Save this file in your current MATLAB directory.
2. Show your work! Make sure you include MATLAB commands.
3. It is fine to work with other students, but what you turn in must be your own work - not
something copied from someone else.
Problem 1 : More Practice with 1-d Arrays (Vectors)
(a) What MATLAB command will create a vector, t, that starts at 0, increments by 0.75, and
ends at 6? Execute the command and display results.
MATLAB Command & Results:
t=0:.75:6
t =
Columns 1 through 4
0 0.7500 1.5000 2.2500
Columns 5 through 8
3.0000 3.7500 4.5000 5.2500
Column 9
6.0000
(b) What MATLAB command will determine how many entries are in vector t? Execute the
command and display results.
MATLAB Command & Results:
numel(t)
ans =
9
1

Homework #2
Remember, t refers to all of the entries in the vector t. To get to specific entries, we need to index
into the vector . For example, t(3) is the 3 rd entry in the vector t. Use indexing for the following
problems .
(c) What MATLAB command will show the 7
th
entry in the vector t? Execute the command and
display results.
MATLAB Command & Results:
t(7)
ans =
4.5000
(d) What MATLAB command will show entries 2 through 5 in the vector t? Execute the
command and display results.