メモ
x<-seq(from=0.01,to=1,by=0.01)
y<-x
cx<-qchisq(1-x,1)
cy<-qchisq(1-y,1)
dx<-dchisq(cx,1)
dy<-dchisq(cy,1)
prodD<-outer(dx,dy,FUN="*")
sumC<-outer(cx,cy,FUN="+")
d2<-dchisq(sumC,2)
plot(prodD)
plot(sumC)
plot(d2)
行列の列の和をとる、行の和をとる、colSums(mat),rowSums(mat)
※FUNは大文字
- 行列の行入れ替え、列入れ替え
> m<-matrix(1:12,3,4) > m [,1] [,2] [,3] [,4] [1,] 1 4 7 10 [2,] 2 5 8 11 [3,] 3 6 9 12 > m2<-m[c(1,3,2),c(1,2,3,4)] > m2 [,1] [,2] [,3] [,4] [1,] 1 4 7 10 [2,] 3 6 9 12 [3,] 2 5 8 11 > m3<-m2[c(1,2,3),c(4,3,2,1)] > m3 [,1] [,2] [,3] [,4] [1,] 10 7 4 1 [2,] 12 9 6 3 [3,] 11 8 5 2