Is there a MATLAB accumarray equivalent in numpy?
Use np.bincount with the weights optional argument. In your example you would do: np.bincount(accmap, weights=a)
accumulator
Should I avoid tail recursion in Prolog and in general?
Short answer: Tail recursion is desirable, but don’t over-emphasize it. Your original program is as tail recursive as you can get in Prolog. But there are more important issues: Correctness and termination. In fact, many implementations are more than willing to sacrifice tail-recursiveness for other properties they consider more important. For example steadfastness. But your … Read more
Spark losing println() on stdout
This is a conceptual question… Imagine You have a big cluster, composed of many workers let’s say n workers and those workers store a partition of an RDD or DataFrame, imagine You start a map task across that data, and inside that map you have a print statement, first of all: Where will that data … Read more
Prolog Accumulators. Are they really a “different” concept?
When you give something a name, it suddenly becomes more real than it used to be. Discussing something can now be done by simply using the name of the concept. Without getting any more philosophical, no, there is nothing special about accumulators, but they are useful. In practice, going through a list without an accumulator: … Read more