MATLAB by rudra pratap

2.2 Lesson 2: Creating and Working with Arrays of Numbers
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2.2 Lesson 2: Creating and Working with Arrays
of Numbers
Goa/: To learn how to create arrays and vectors and how to perform arithmetic
and trigonometric operations on them.
An array is a list of numbers or expressions arranged in horizontal rows and vertical
columns. When an array has only one row or column, it is called a vector. An array
with m rows and n columns is called a rrw.trix of size m x n.
information.
What you are going to learn
See Sp,etion 3.1 for more
Time Estimates
Lesson: 15 minutes
Exercises: 45 minutes
• How to create row and column vectors.
• How to create a vector of n numbers linearly (equally) spaced between two
given numbers a and b.
• How to do simple arithmetic operations on vectors.
• How to do array operations:
·*
./
term-by-term multiplication,
term-by-term division, and
term-by-term exponentiation.
• How to use trigonometric functions with array arguments.
• How to use elementary math functions such as square root, exponentials, and
logarithms with array arguments.
This lesson deals primarily with 1-D arrays, i.e., vectors. One of the exercises
introduces you to 2-D arrays, i.e., matrices. There are many mathematical concepts
associated with vectors and matrices that we do not mention here. If you have some
background in linear algebra, you will find that MATLAB is set up to do almost
any matrix computation (e.g., inverse, determinant, rank).
Method: You already know huw to launch MATLAB. Co ahead and try the
commands shown in Fig. 2.2. Once again, you are going to reproduce the results
shown.