thanks,
can I ask another basic question?
I have a matrix (10000 X 6). 10000 rows and 6 columns.
I want to remove rows that have sd(col1, col2,col3) <1 or sd(col4,col5,col6)
<1.
what is the simple way?
Yu
Duncan Murdoch <[EMAIL PROTECTED]> wrote:
On 16/04/2008 7:33 PM, Yuan Jian wrote:
> Hello,
> I have a matrix, I want to change value to 0 when a element in the matrix has
> less than 10.
> do you know how to do it without using loops?
A[A < 10] <- 0
Remember that matrices are just vectors with dimensions, so you can
index one like a vector.
Duncan Murdoch
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