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Add to int array with ruby; how?

For general discussion related FlowStone

Add to int array with ruby; how?

Postby kortezzzz » Sun Mar 04, 2018 2:40 pm

Hi all. A ruby question:
Seems like we have to use ruby to add each int value in a int array with a fixed number, because there is no "add to int array" primitive. lets say I have A given array like

3
4
2
3

and I would like to add 2 to each value and end up with

5
6
4
5

How it done with ruby, by using 2 inputs (one input for the array and one for the int value that added to each value in the array) and one int array output for the results?
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Re: Add to int array with ruby; how?

Postby KG_is_back » Sun Mar 04, 2018 2:45 pm

assuming first input is the array and second input is the integer

Code: Select all
output @ins[0].map!{|v| v+@ins[1]}
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Re: Add to int array with ruby; how?

Postby tulamide » Sun Mar 04, 2018 2:55 pm

I wouldn't use the altering version. Just "map" without "!" will do. You're outputting an array anyway so why bothering with the slower alteration of the original array?
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Re: Add to int array with ruby; how?

Postby KG_is_back » Sun Mar 04, 2018 3:21 pm

tulamide wrote:I wouldn't use the altering version. Just "map" without "!" will do. You're outputting an array anyway so why bothering with the slower alteration of the original array?


the ! is in fact faster, because it does not allocate a second array - it just modifies the existing one element by element. The inputs and outputs inside ruby actually aren't directly usable by flowstone - flowstone converts them to green connectors on the way out and vice versa for the inputs. Using the ! version ensures that internally, the same array is in the @ins array and @outs array, saving memory and CPU. Although very marginally...
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Re: Add to int array with ruby; how?

Postby tulamide » Sun Mar 04, 2018 3:42 pm

KG_is_back wrote:
tulamide wrote:I wouldn't use the altering version. Just "map" without "!" will do. You're outputting an array anyway so why bothering with the slower alteration of the original array?


the ! is in fact faster, because it does not allocate a second array - it just modifies the existing one element by element. The inputs and outputs inside ruby actually aren't directly usable by flowstone - flowstone converts them to green connectors on the way out and vice versa for the inputs. Using the ! version ensures that internally, the same array is in the @ins array and @outs array, saving memory and CPU. Although very marginally...

You're right! Since Flowstone doesn't allow for long iterations, I looked on the internet instead. Here is one example, where "merge" is used in both forms (I just learned the ! ones are called the bang! versions). Time is in seconds, array length is 10000, ten consecutive runs
Code: Select all
                 user     system      total        real
merge!       0.010000   0.000000   0.010000 (  0.011370)
merge       17.710000   0.000000  17.710000 ( 17.840856)
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Re: Add to int array with ruby; how?

Postby kortezzzz » Sun Mar 04, 2018 4:15 pm

Thanks KJ, but this ime tula's "no !" worked as expected :)

For some reason, when you add the "!" to the code, it saves older values and then add them with the new ones.
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