yield a[:k + 1] ??

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alphachap

in General Discussion • Other • 2 years ago

What means the following instruction ? yield a[:k + 1]

I know a is an integer array, but what is yield? What is :?

I suspect yield could mean output or print.

Cause I'm copying (translating) this program into Processing.

The source is from http://homepages.ed.ac.uk/jkellehe/partitions.php
Thanks

Replies(5)

blindfish

Did you try searching online? The original code is in Python. A Google search on python yield turned up:

http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained

Not sure if Java offers a similar method - I guess you might need to look at the Collections Framework

alphachap

Re: yield a[:k + 1] ??

2 years ago

Thank for the answer.

It's still not enough for me to make the program work.

I will email the author.

I also found this reference explaining the "yield" instruction:

http://www.python.org/dev/peps/pep-0255/

but all this is getting me too far from Processing..

added: in the end I made it work, and got this output:

n = 5
-- Enumerating Integer Partitions: ZS1 algorithm:
5 4.1 3.2 3.1.1 2.2.1 2.1.1.1 1.1.1.1.1
-- Enumerating Integer Partitions: ZS2 algorithm:
1.1.1.1.1 2.1.1.1 2.2.1 3.1.1 3.2 4.1 5
-- Enumerating Integer Partitions: acceleratedAscending algorithm:
1.1.1.1.1 1.1.1.2 1.1.3 1.2.2 1.4 2.3 5

Thanks for the help

blindfish

Re: yield a[:k + 1] ??

2 years ago

It's still not enough for me to make the program work.

Obviously not: you're going to have to do some work yourself to figure out an equivalent method to 'yield' in Java. Perhaps do some research on Generators. Using Google doesn't require a huge amount of effort ;)

[edit] TBH if you contact the author it will probably be obvious that you haven't done any proper research. In that situation I wouldn't be surprised if the response you get is RTFM.[/edit]

PhiLho

Re: yield a[:k + 1] ??

2 years ago

Out of curiosity, do you have a concrete (graphical) application for such algorithm, or is that just for learning purpose?
[tongue-in-cheek]Maybe you want to code that in Scala, it has similar functional capabilities than Python[/tongue-in-check]
Or even use the Python version of Processing.

alphachap

Re: Re: yield a[:k + 1] ??

2 years ago

No graphic, just for learning.

But I'm starting to find Java overly complicated.

I may soon try something else, something more friendly, but I don't know what.

Maybe Python, maybe Scala (I will have to learn a bit about them first).

I didn't know there was a Python version of Processing.

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