Hi will,Thanks for your reply. The simplified code is as follows, and
you can run it if you like. It takes 7 seconds to process 1000 rows,
which is tolerable, but I wonder why it takes so long, because I also
did one for loop through all of the same rows without accessing array,
which only takes 1
Hi,
I am writing code to sort the columns according to the sum of each
column. The dataset is huge (50k rows x 300k cols), so i need to read
line by line and do the summation to avoid the out-of-memory problem.
But I don't know why it runs very slow, and part of the code is as
follows. I suspect i
