Linked Questions
18 questions linked to/from Difference between AbsoluteTiming and Timing
5
votes
3
answers
1k
views
Incresing efficiency of the code:
I have a set of points, representing location of events in a map, and I want to find the closest neighbour for each point. Variable xys is a 2D matrix containing ...
- 315
1
vote
3
answers
450
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, ...
- 71
25
votes
2
answers
11k
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....
- 806
20
votes
2
answers
708
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:
...
- 10.1k
7
votes
2
answers
287
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 ...
- 1,751
3
votes
2
answers
128
views
56
votes
1
answer
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?
- 232k
18
votes
1
answer
281
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
...
- 16.9k
2
votes
1
answer
108
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
1
answer
107
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 ...
- 4,984
1
vote
1
answer
55
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
1
answer
235
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
6
votes
0
answers
208
views
Difference between Timing, AbsoluteTiming, and Elapsed?
In the picture below,
Difference between Timing, AbsoluteTiming, Time and ...
- 1,195
0
votes
0
answers
51
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 ...
- 327
0
votes
0
answers
117
views
