Week 6 Feb 8.pdf

# Week 6 Feb 8.pdf - Week 6 Feb 8 Wednesday 12:23 PM Random...

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runif(# of numbers, lower bound = 0, upper bound = 1) Random numbers actually repeat after a certain number of periods (pseudo-random) same "random" numbers will pop up if you set seed before running runif Set seed (set.seed) so you can reproduce results if needed sample(max number) creates line of mumbers 0- max in random order Random Numbers data + runif (# of data elements, -0.5, +0.5) Helps see points that may be overlapping on graph Jitter f <- function() { if(runif(1)<0.15) { print("u ded") } else if (runif(1) < 0.4) { print("u lucky") } else { print("zinger") } } Random numbers at work: position <- numeric(steps+1) position[i+1] <- position[i] + 1 if (runif(1) < 0.5) else position[i+1] <- position[i] - 1 for (i in 1:steps) { } position random_walk <- function (steps) { } "Random Walk" Exist only within a function, not console as a whole l s() allows you to see all defined variables in an environment rm(var) removes a variable print (abc) # refers to the global variable ’abc’ print (xyz) # refers to the local variable (argument) 'xyz'

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• Winter '17

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