## Description

Part 1

This is one way to convert a string into a vector of digits.

n = 123;

s = num2str(n) % convert n to a string

s =

123

V = double(s) % convert chars to character codes

V =

49 50 51

V = V – ‘0’ % convert character codes to digits 0-9

ans =

1 2 3

Type each of these statements to see how they work. Try them with different

numbers. Can you combine these statements into one statement that does the

same thing?

Part 2

Turn the conversion statement (or statements) from part 1 into a function

called num2vec.

Examples of using the function:

num2vec(123)

ans =

1 2 3

num2vec(98765)

ans =

9 8 7 6 5

2

length(ans)

ans =

5

Part 2a

Write a second num2vec function (call it num2vec2) that does the same thing

that num2vec does, but it uses a loop to create the vector. In this function you

are not allowed to use strings, nor are you allowed to use functions that use

strings (num2str or str2num).

Hint: The rem function would be really useful here.

Part 3a

Write a vec2num function that does the opposite of the num2vec function: it

takes a vector of digits and converts it into a number. Hint: This function must

do the opposite operations as the num2vec function, and it must do them in

the opposite order.

n = vec2num([9 8 7 6 5])

n =

98765

class(n)

ans =

double

size(n)

ans =

1 1

Part 3b

Write a second vec2num function (call it vec2num2) that does the same thing

that vec2num does, but it uses a loop to create the number. In this function

you are not allowed to use strings, nor are you allowed to use functions that

use strings (num2str or str2num).