Constructing symmetric matrix on R

Question

I want to construct a 1000x1000 symmetric matrix where all diagonal elements are 1 and others are 0.5. I don't know how to do this for such a large matrix. Can someone help me out here?

Thank you!

@statsfox consider using `toeplitz(c(1,rep(0.5,999)))` – Onyambu Apr 25 '18 at 19:11 — Onyambu, Apr 25 '18 at 19:11

score 3 · Accepted Answer · answered Apr 25 '18 at 15:09

3

m <- matrix(0.5, ncol = 1000, nrow = 1000)
diag(m) <- 1

answered Apr 25 '18 at 15:09

AshOfFire

676
5
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Simple! Thank you very much. – epsilonfox Apr 25 '18 at 15:14
1

@statsfox - if this answer solves your post consider accepting it - click on check mark to the left – CPak Apr 25 '18 at 15:36
@statsfox you should use `toeplitz(c(1,rep(0.5,999)))` – Onyambu Apr 25 '18 at 19:10
@AshOfFire you should consider `toeplitz(c(1,rep(0.5,999)))` – Onyambu Apr 25 '18 at 19:12
@Onyambu this actually answers another problem I encountered later today! Thank you very much – epsilonfox Apr 25 '18 at 19:43

Constructing symmetric matrix on R

1 Answers1