All Questions
Tagged with distributions performance-tuning
10 questions with no upvoted or accepted answers
4
votes
0
answers
76
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Why is ProbabilityDistribution 100x slower than ExtremeValueDistribution?
The two distributions are the same, except the ProbabilityDistribution cuts out below x=0. The wolfram documentation on ProbabilityDistribution says nothing about speed. A search of this site gave no ...
- 1,637
2
votes
0
answers
137
views
Insights on using the HypergeometricDistribution functions in Mathematica
I'm trying to calculate the upper confidence interval for the hypergeometric distribution in mathematica and I came up with this very simple code.
...
- 580
2
votes
0
answers
115
views
Optimization of custom probability distibutions?
Consider the two tests:
Timing[Do[RandomVariate[NormalDistribution[0.5, 0.3]], {200}]]
{0.001188, Null}
...
- 1,890
1
vote
0
answers
41
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Speed up exact distribution of the sum of the top $k$ statistics on a bounded discrete uniform distribution?
I came across a nice answer by Sasha (I believe a Wolfram engineer) on mathematics stack exchange regarding the distribution of the sum of the top $k$ order statistics. (This was an answer to an RPG ...
- 26k
1
vote
0
answers
53
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Can LearnDistribution Train and Generate Images Without Defaulting To 256x256?
In spite of anything I try it seems the ConformImages[] function nested in the LearnDistribution[] function resizes images to 256x256.
If I convert an image into its "Data" representation before ...
- 21
1
vote
0
answers
60
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Why is this parallel notebook not maxing out the available memory and processors?
I've searched many questions about parallel processing here, and they are either specialized or over my head. I run the following parallel notebook on an 8 core EC2 instance. The average memory usage ...
- 1,637
1
vote
0
answers
155
views
How to properly (efficiently) define a mixture distribution and optimize the likelihood?
To start with:
...
- 5,036
0
votes
0
answers
106
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Optimizing a While Loop for High-Precision Computation in Mathematica
Edit: Clarifying the Core Issue
i=x;
While[Abs[p1 - p2] >= p1 tol,
p2 = p1;
p1 += s *= i (mkn + i)/((k1 - i) (n1 - i));
i--;
];
The core of my ...
- 580
0
votes
0
answers
31
views
SmoothKernelDistribution only uses 1 core
I have a huge amount of datasets, each containing many elements, and trying to convert it to PDF using SmoothKernelDistribution. I see that applying it to 1 dataset ...
- 5,963
0
votes
0
answers
38
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Slow SmoothKernelDistribution of WeightedData
Consider some data in the form
data = {{x,y,weight(x,y)},...};
I make
wd = WeightedData[data[[All,{1,2}]],data[[All,3]]];
I ...
- 5,963