Scalar operations: Scalar operations take a double/float/int value and do an operation for each As with element-wise operations, there are in-place and copy operations..
What's worse is that in the particular application, the matrices were all fixed size, and matrix arithmetic would have been just as fast in Lisp as in FORTRAN.
First, the append() operation has to reallocate memory, and while it uses some tricks to avoid doing that each time, it still has to do it occasionally, and that costs quite a bit.
While the in and not in operations are used only for simple containment testing in the general case, some specialised sequences(such as str, bytes and bytearray) also use them for subsequence testing.
This operation is functionally identical to a"remove" operation for a value, followed immediately by an"add" operation at the same location with the replacement value.
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