10 questions linked to/from Why is Plus so much slower than Total?
7k views

### What is a Mathematica packed array?

A simple sounding question with a few sub questions: What is the difference between unpacked vs packed array? Are packed arrays more space efficent, how much so? Are packed arrays more time ...
2k views

### Are there guidelines for avoiding the unpacking of a packed array?

Packed arrays are very useful because they save memory and generally allow speedier and more efficient calculation times. If a list of data currently stored as a packed array is unpacked, it can slow ...
1k views

### Product of elements of a list

Sum is for functions; Total is for a list. Product is for a function; what is the command ...
3k views

### Fastest way to measure Hamming distance of integers

I am looking for a fast and robust way to calculate the Hamming distance of integers. The Hamming distance of two integers is the number of matching bits in their binary representations. I expect that ...
1k views

### Why it seems that there is no counterpart function as to multiplication, to Total as to addition?

Times and Plus have the same grammar, and so do Product and ...
605 views

### The speed of Sum[] varies strangely

I was curious about the difference in speed between Total and Sum. I found out Total was ...
576 views

### Incorrect Timing of Total

For demonstrating how fast C-compiled functions can be, in one of my courses I use the following function for finding the sum of a list of reals: ...
366 views

### Why does taking advantage of Listable change the results of a numerical computation slightly?

I have two variables: t0, and teta0. The first is computed using several nested sums, the second is computed taking advantage to ...