Thanks very much Don! You alternative method does make it much faster.
However I think I made a mistake in my previous coding. Sorry.
Instead of checking whether each row sum is larger than 8, what I wanted is
to
check whether each column sum is lager than 8. See the code below.
So in this case,
This is a good example to illustrate that R is a vectorized language, and
programming concepts that would work in fortran, C, or any of many other
languages are not always effective in R.
The vectorized method below has produced the same value for 'p' in every
example I¹ve tried, and is much faste
Hi all,
I have four matrix tmp_a, tmp_b, tmp_c and tmp_d whose dimensions are
shown as below.
I want to take one row from each of these matrices and then put the four
selected rows into a matrix.
I want to count the number of such matrices for which the vector of row sum
is less than or equal to (
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