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Consider the code below:
k <- c(.5, 1)
What does c do here? I think it must be a list or vector. If it is, how can I extend this vector to contain 1024 values?
2 Answers
In R, the c() function returns a vector (a one dimensional array).
In your example:
k <- c(0.5, 1) # k is a vector
k[1] # is 0.5 (remember, R indices start on 1)
k[2] # is 1
If you want to create a vector with 1024 entries (assuming 0.5 increments), you have at least two ways to do it:
# One way
k <- (1:1024) / 2 # this will be 0.5, 1, 1.5, 2, ... , 512
# Another way:
k <- seq(0.5, 512, 0.5)
Also you can use c() to concatenate two vectors:
k <- c(0.5, 1) # k = 0.5, 1
k <- c(k, 1.5) # k = 0.5, 1, 1.5
k <- c(k, c(2, 2.5)) # k = 0.5, 1, 1.5, 2, 2.5
k <- c(k, k) # k = 0.5, 1, 1.5, 2, 2.5, 0.5, 1, 1.5, 2, 2.5
Please check the help for c() and seq function (in R: ?c and ?seq)
Reference:
The c function in R is used to create a vector with values you provide explicitly. If you want a sequence of values you can use the : operator. For example,
k <- 1:1024
gives you a vector with 1024 values.
The built-in help in R is pretty good for questions like this. Just type ?functionName in your R terminal to get help on any function loaded in your environment.
