R reshape a vector into multiple columns

问题:

Let's say I have a vector in R as follows:

d<-seq(1,100)

I want to reshape this vector into a 10x10 matrix, so that I will have this data instead:

[,1]  [,2]  [,3]  ..  [,10]   
  1      2    3   ..   10
  11    12   13   ..   20
  21    22   23   ..   30
  ..
  91    92   93    ..  100

I tried to use reshape function, but it didn't work. Can someone help please?

回答1:

You can do

dim(d) <- c(10, 10)
d <- t(d)

or

d <- matrix(d, nrow = 10, byrow = TRUE)

回答2:

If you want to convert a predifined list to a matrix (e.g. a 5*4 matrix), do

yourMatrix <- matrix(unlist(yourList), nrow = 5, ncol = 4)

It is worth noting that the matrix is created by columns, which means your data will be filled into the matrix by columns. So, if you want to the matrix created by rows, simply using t(), such as

yourMatrix <- matrix(unlist(yourList), nrow = 4, ncol = 5)  # exchanges the cols and rows
yourMatrix <- t(yourMatrix)  # matrix transpose