Define a vector with sequence in R

Question

I would like to create a sequence of theta (1,100),(2,100),(3,100)...(100,100)

theta[1] is seq(from = 1 , to = 100 , length =100)

theta[2] is 1

How should I define theta?

Answer 1

I think your are just looking for a matrix somehow, or a data.frame. I guess you actually want theta[2] = 100 to make sense. So

 theta = matrix(c(seq(1,100),rep(1,100)),nrow = 100,ncol = 2)

will give you the pair in each row theta[n,], and from your definition theta[1] will now be theta[,1] , theta[2] will be theta[,2]

Answer 2

Just create your two sequences, and row-bind them:

theta = rbind(seq(from=1, to=100, length=100), rep(100,100))

Now your theta will look like this:

     [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12] [,13] [,14] ...
[1,]    1    2    3    4    5    6    7    8    9    10    11    12    13    14 ...
[2,]  100  100  100  100  100  100  100  100  100   100   100   100   100   100 ...

and theta[1,] will be a sequence from 1 to 100, and theta[2,] a sequence of all 100s of size 100.