- (スカラー・)ベクトル・アレイは要素数が確定しているので、ループを回して網羅することができます
- ベクトルの場合
v<-1:5
L<-length(v)
print(L)
v2<-rep(0,L)
print(v2)
for(i in 1:L){
v2[i]<-v[i]^2
print(paste("i is ", i))
print(v2)
}
print(v2)
> v<-1:5
>
> L<-length(v)
> print(L)
[1] 5
> v2<-rep(0,L)
> print(v2)
[1] 0 0 0 0 0
> for(i in 1:L){
+ v2[i]<-v[i]^2
+ print(paste("i is ", i))
+ print(v2)
+ }
[1] "i is 1"
[1] 1 0 0 0 0
[1] "i is 2"
[1] 1 4 0 0 0
[1] "i is 3"
[1] 1 4 9 0 0
[1] "i is 4"
[1] 1 4 9 16 0
[1] "i is 5"
[1] 1 4 9 16 25
> print(v2)
[1] 1 4 9 16 25
m<-matrix(1:6,2,3)
print(m)
L<-dim(m)
print(L)
m2<-matrix(0,nrow=L[1],ncol=L[2])
print(m2)
for(i in 1:L[1]){
for(j in 1:L[2]){
m2[i,j]<-m[i,j]+1
print(m2)
}
}
m2-m
> m<-matrix(1:6,2,3)
> print(m)
[,1] [,2] [,3]
[1,] 1 3 5
[2,] 2 4 6
> L<-dim(m)
> print(L)
[1] 2 3
> m2<-matrix(0,nrow=L[1],ncol=L[2])
> print(m2)
[,1] [,2] [,3]
[1,] 0 0 0
[2,] 0 0 0
> for(i in 1:L[1]){
+ for(j in 1:L[2]){
+ m2[i,j]<-m[i,j]+1
+ print(m2)
+ }
+ }
[,1] [,2] [,3]
[1,] 2 0 0
[2,] 0 0 0
[,1] [,2] [,3]
[1,] 2 4 0
[2,] 0 0 0
[,1] [,2] [,3]
[1,] 2 4 6
[2,] 0 0 0
[,1] [,2] [,3]
[1,] 2 4 6
[2,] 3 0 0
[,1] [,2] [,3]
[1,] 2 4 6
[2,] 3 5 0
[,1] [,2] [,3]
[1,] 2 4 6
[2,] 3 5 7
> m2-m
[,1] [,2] [,3]
[1,] 1 1 1
[2,] 1 1 1
d<-c(2,3,4)
Nc<-prod(d)
print(Nc)
a<-array(1:Nc,d)
print(a)
x<-list()
for(i in 1:length(d)){
x[[i]]<-1:d[i]
}
print(x)
X<-expand.grid(x)
dim(X)
prod(d)
length(d)
print(X)
for(i in 1:length(X[,1])){
print(a[i])
}
>
>
> for(i in 1:length(X[,1])){
+
+
+ print(a[i])
+ }
[1] 1
[1] 2
[1] 3
[1] 4
[1] 5
[1] 6
[1] 7
[1] 8
[1] 9
[1] 10
[1] 11
[1] 12
[1] 13
[1] 14
[1] 15
[1] 16
[1] 17
[1] 18
[1] 19
[1] 20
[1] 21
[1] 22
[1] 23
[1] 24