(Please forgive me for my wording since i am still a newbie)
i know that something like `TheMatrix.ptr(vi) `can create a pointer with the elements of one row. I wonder if there's a way to create pointers containing the elements of one column (so that i can quickly access the elements in column sequence)?
PS: i would prefer a fast way since i would like to do some practical applications. So i would not consider method like transpose and use the `ptr.<>()`...
Thanks in advance!
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