Linked Questions
18 questions linked to/from Difference between AbsoluteTiming and Timing
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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
55
votes
1
answer
5k
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Why won't Parallelize speed up my code?
What reasons are there that can cause parallelized Mathematica code not to run with full performance?
- 231k
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2
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11k
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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
25
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4
answers
1k
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Throwaway memoization makes built-ins faster?
Yesterday I got into an argument with @UnchartedWorks over in the comment thread here. At first glance, he posted a duplicate of Marius' answer, but with some unnecessary memoization:
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18
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3
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571
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Difference between HashTable datastructure and Association datastructure
Is there a difference in the runtimes between CreateDataStructure["HashTable"] and <||> in terms of inserting, ...
- 558
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6
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463
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Deleting duplicates of a list without touching specified elemets
Suppose I have a list, for example: list = {1, 3, 5, 5, 12, 12, 6, 11, 7, 7, 9, 10, 2, 2, 4}; and list of duplicates positions in the list ...
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2
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686
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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:
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votes
3
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1k
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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
7
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2
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285
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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 ...
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18
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1
answer
279
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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
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- 16.6k
1
vote
3
answers
436
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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, ...
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2
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1
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1
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231
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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 ...
- 2,550
2
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1
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98
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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
6
votes
0
answers
191
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Difference between Timing, AbsoluteTiming, and Elapsed?
In the picture below,
Difference between Timing, AbsoluteTiming, Time and ...
- 1,163