Chapter 4 R fundamentals

4.1 R syntax

variable types

comparisons

if-statements

for loops

functions

4.2 Troubleshooting

4.3 Data structures

vectors/matrices/dataframes

# Initiating a matrix with numbers
Matrix1     = data.frame(matrix(nrow=3,
                                ncol=2))
Column1     = c(1,2,3)
Column2     = seq(2,6,2)
Matrix1[,c(1,2,3)] = c(Column1,Column2,Column2)
# Oops! we duplicated a column! Now let's remove the third column
Matrix1     = Matrix1[,-3]
rownames(Matrix1) = c("a","b","c")
colnames(Matrix1) = c("time","value")

# Extracting data
Matrix1$time

## [1] 1 2 3

data importing and exporting

4.4 writing scripts

file - organization