CSSS 508: Intro R
CSSS 508: Intro R
2/03/06
Homework 4 Solutions
These solutions are just one way you could write these functions. There will be lots of correct solutions. I will post clever/good/different ones for your perusal.
Coding style is personal, but I’ve tried to mix it up.
1) Write a function that takes in a vector of numbers and returns only the minimum and the maximum of the vector. Generate 10 random normal values (print them) and test your function on them.
########################################
##Function 1
##
##Arguments: vector of numbers
##Outputs: min and max of the vector
########################################
min.max add.odd(17)
[1] 81
If you’re fancy, you could write it to handle both positive and negative numbers.
add.odd0)odd.numbers add.odd(-6) (1 + -1 + -3 + -5)
[1] -8
3) Write a function that only takes in the dimensions of a matrix and a vector of n means. Generate a matrix of the given size where the first row is a random sample from a normal with the first mean and a standard deviation of 1, the second row is a random sample from a normal with the second mean and a standard deviation of 1, etc. (All standard deviations should be 1.) Find the median number in each row. Return both the matrix and the vector of n medians.
########################################
##Function 3
##
##Arguments: n: nrow of a matrix; p: ncol of a matrix; mean.vec: vector of n means
##Outputs: generated matrix; vector of medians
########################################
gen.norm.matrix ................
................
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