Lign251 FAQ

From Rlang

How do I print plots to file?

Read Section 12.6 of the [Introduction to R] manual. Specifically, you'll be interested in the jpeg(), postscript(), and dev.off() commands. Also see the solution to problem 3 in [Homework 1].

How do I read the Homework 2 data file?

Sorry, I should have given you this info in advance. You use read.table() to read the file into a data frame, but you need to tell read.table() to treat the character ' literally instead of as a special quote character. Here's the code to read the data file:

Hints on Homework 3, problem 2

Writing the code for this assignment may be easier using a for() loop. Here's an example:

 possible.N <- seq(2,100,by=2)
 mean.by.N <- NULL
 for(N in possible.N) {
   mean.for.this.N <- ###insert your code here###
   mean.by.N <- c(mean.by.N,mean.for.this.N) 
 }
 # now plot mean.by.N against possible.N

For more about for() loops in R, read [Section 9.2.2] of the [Introduction to R] manual.