Lab 4 Activity Activity4 Lab4 Instructions

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Lab 4 - Activity
Oleksandr Savenkov
10/3/2018
1. Write a function that normalizes a vector (with two parameters) :
• vector to be normalized
• parameter that allows normalize the vector in two ways: only centered with zero mean and also
standardize with mean zero and standard deviation 1
Example:
• input (1, 2, 3, 4)
• centered vector is
standardize(a, centered_only = TRUE)
## [1] -1.5 -0.5

0.5

1.5

• standardized is
standardize(a, centered_only = FALSE)
## [1] -1.1618950 -0.3872983

0.3872983

1.1618950

2. Modify previous function in order to handle missing values in a vector
standardize(c(1, 2, 3, 4, NA))
## [1] NA NA NA NA NA
standardize(c(1, 2, 3, 4, NA), na.rm = TRUE)
## [1] -1.1618950 -0.3872983

0.3872983

1.1618950

NA

2. Create a 4 by 4 matrix
##
##
##
##
##

[1,]
[2,]
[3,]
[4,]

[,1] [,2] [,3] [,4]
1
5
9
13
2
6
10
14
3
7
11
15
4
8
12
16

Create a function to calculate sum of matrix elements without built-in function sum()

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Author                          : Oleksandr Savenkov
Title                           : Lab 4 - Activity
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