Linked Questions
12 questions linked to/from Is there a built-in equivalent to Python's enumerate?
18
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8
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How to map and sum a list fast?
The following takes a lot of memory and is slow:
AbsoluteTiming[Total[Map[#^2 &, Range[1, 100000000]]]]
I suspect this is because it first calculates and ...
- 533
19
votes
5
answers
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Append a list as a column in a dataset
I have a Dataset and a List, called dataset and intervals, and I would like to append the list as a new column of the dataset. I ...
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17
votes
4
answers
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Lazy form of Tuples/Outer to loop over list of lists
This is less a question and more asking if someone has implemented this already, with more skill.
I need to perform the Outer-like generalized outer product of a ...
- 1,067
34
votes
1
answer
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Efficient lazy weak compositions
In Mathematica all weak k-compositions of integer n can be generated using permutations of integer partitions:
...
- 15.1k
11
votes
1
answer
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Alternative to Subsets to generate k-combinations
I need to generare a huge number of k-combinations for a quite big set of numbers (more than 100), so I would avoid Subsets because it requires too much memory (it generates all subsets at once). I ...
- 2,047
10
votes
2
answers
516
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Breaking "Functional Loops" and Doing Lazy Evaluation In Mathematica
Alright, so this is a question about the functional way to break a for/while loop. Since we're on the Mathematica SE, I'm interested in the ways a Mathematica vet would handle this, however the ...
- 401
20
votes
1
answer
400
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How to use Streaming package in v11.1?
I am trying to use the streaming package for lazy list operations demonstrated in this post. But I found that the package was significantly changed in version 11. After some observations, I found that ...
- 7,911
9
votes
0
answers
188
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Performance improvements by using Activate and Inactivate
In a question about improving performance of a TensorContract of a TensorProduct, user jose suggested replacing
...
- 598
4
votes
0
answers
142
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Determining what symbols are defined in a DumpSave / .mx file [duplicate]
Against my better judgement, and in the interest of speedy I/O, I've decided to use .mx files for a project - limitations and all. I'm dealing with a few gigabyte-...
- 1,800
3
votes
0
answers
162
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What is the best equivalent way in MMA to micmicking python's generator expression?
In python, there is a syntax called generator expression. For example, [i for i in range(1,5)], [i**2 for i in range(1,5)], and <...
- 1,191
3
votes
0
answers
119
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How do I get built-in functions to use custom objects as if they were e.g. List?
(This is part 2 of my earlier question, Can I overload Part for specific heads (a la overloaded array subscripting)?, which was well-answered as asked.)
Overview:
My goal is to create a custom object -...
user75893
2
votes
0
answers
97
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Is it possible to generate iterators dynamically during parallel processing?
I have a parallel processing code written in Wolfram Mathematica, similar to:
...
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