19 questions linked to/from Difference between AbsoluteTiming and Timing
1 vote
488 views

### Fastest way to find roots

I'm working with generative polynomials, and would like to know if there is a faster way to calculate roots. Using the technique below I've managed to cut the time down significantly. However at n=35, ...
• 115
12k views

### Measuring execution time of code

How one can measure the execution time (time that is spent for code to finish) of a program in Mathematica? I understand that there are general timing functions (Timing, AbsoluteTiming, TimeUsed, etc....
• 827
755 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: ...
• 10.2k
306 views

### How to select the fastest approach for large numerical data computations?

I really love the flexibility of Mathematica: there are several ways to perform one task. However, to get the performance of the intense numeric calculation, it can ...
• 1,761
131 views

### NIntegrate timing discrepancy

When I run the following identical numerical integrals ...
• 1,043
5k views

### Why won't Parallelize speed up my code?

What reasons are there that can cause parallelized Mathematica code not to run with full performance?
• 236k
282 views

### Why Function is not identical to & in autocompilation?

Here is the example, copied from here square = Function[x, x^2]; square1 = #^2 &; the timing and unpacking status shows ...
• 17.2k
134 views

### Why the "Sum" function becomes extremely slow at a specific size of matrix? How to AVOID it? [duplicate]

Three methods("Sum", "Total@Table" and "Do") have been used to do the same work. The "Sum" and "Total@Table" function becomes extremely slow at num=...
• 97
1 vote
109 views

### How to make that interpolation?

I have the following dataset: SetDirectory[NotebookDirectory[]]; TableSpectrum = Import["spectrum.dat", "Table"]; I want to make the interpolation. However, when ...
• 5,887
1 vote
62 views

### Why do I keep getting the same time from the Timing function?

I am running a gamblers problem solution where I am testing the timing involved in solving the Ax = b equation for matrices of n=100, 1000, 10000, and 100000. For some reason I keep getting the same ...
• 257
1 vote
246 views

### Why, according to Timing, is this code so FAST?

Obviously (?) I have a problem with precision or something but MMA seems to be able to take the mean squared of a 1e7 long series of random reals in literally no time, unless I use RepeatedTiming ...
• 2,560
233 views

### Difference between Timing, AbsoluteTiming, and Elapsed?

In the picture below, Difference between Timing, AbsoluteTiming, Time and ...
• 1,748
74 views

### Can we explain why Timing is inconsistent?

I am trying to speed up a code and by placing Timing statements in the code I identified a suspect calculation that I do repeatedly. In order to test out the ...
• 16.6k
52 views

### What could cause Timing to report erroneously? [duplicate]

I am using Timing to measure the time it takes to load a ".dat" file and the reported time (4.47 seconds) is waaaay below the real time (measured using a stopwatch ...