Hi Weicheng,
Did you forget to add " " to index your elements? The following example
works perfectly fine.
test.matrix = matrix(1:4,nrow=2) ;
rownames(test.matrix)=c("hi1","hi2") ;
colnames(test.matrix)=c("bye1","bye2") ;
test.matrix
bye1 bye2
hi1 1 3
hi2 2 4
test.matrix["hi1","bye2"] ;
[1] 3
ran.row = sample(x=rownames(test.matrix),size=1) ;
ran.col = sample(x=colnames(test.matrix),size=1) ;
test.matrix[ran.row,ran.col] ;
Is this in a way what you were trying to get?
Best of luck,
Luc
weicheng wang wrote:
Hi, I want to use the value of variable to quote elements in matrix.
For example, I have a matrix like:
y1 y2m1 1 2m2 3 4
where y1,y2,m1,m2 are column and row names. I have two random character variable, say x, that could be either y1 or y2 and y that could be either m1 or m2. So can I do like Matrix[y,x] to quote elements? I've tried this way but it simply use "x" and "y" itself rather its value as column or row names. I want to use the value of x and y as colunm or row names. So when x="y1" and y="m1" in cases, I want to matrix[x,y]=1.
please help.
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