Correctly splatting for String Tuples

General Usage
1

I’m attempting to splat two string tuples (n and m dims) so that they create a n by m array with the combinations of every element together. So if I have

data=
       (
           ("1.20e3", "1.08e3", "0.96e3"),
           ("3.0e5", "2.7e5")
       )

Then if I apply

vec(collect.(Base.product(data...)))

I can get

6-element Vector{Vector{String}}:
 ["1.20e3", "3.0e5"]
 ["1.08e3", "3.0e5"]
 ["0.96e3", "3.0e5"]
 ["1.20e3", "2.7e5"]
 ["1.08e3", "2.7e5"]
 ["0.96e3", "2.7e5"]

This code works for any size n and m as long as they are both greater than 1. But if I have

data=
       (
           ("1.20e3", "1.08e3", "0.96e3"),
           ("3.0e5")
       )

Then I get

15-element Vector{Vector{Any}}:
 ["1.20e3", '3']
 ["1.08e3", '3']
 ["0.96e3", '3']
 ["1.20e3", '.']
 ["1.08e3", '.']
 ["0.96e3", '.']
 ["1.20e3", '0']
 ["1.08e3", '0']
 ["0.96e3", '0']
 ["1.20e3", 'e']
 ["1.08e3", 'e']
 ["0.96e3", 'e']
 ["1.20e3", '5']
 ["1.08e3", '5']
 ["0.96e3", '5']

when obviously I would like it to be

3-element Vector{Vector{String}}:
 ["1.20e3", "3.0e5"]
 ["1.08e3", "3.0e5"]
 ["0.96e3", "3.0e5"]

My understanding is that when I apply the splatting operator, it expands the single element tuple as a iterator of characters rather than an iterator of strings in a tuple.

So would anyone know how I could get the behavior that I outlined? I am working on a code that interfaces with OpenFOAM so the strings are properties of fluid variables that I need to replace in OpenFOAM text dictionaries. Thank you if you spend time on my question! Have a good day.

2

Hi, In your second example, ("3.0e5") is not parsed as a tuple but as a string. You’d need a comma in there ("3.0e5", )

1 Like
3

Yes that was it, thank you! I see now that’s directly in the documentation of Julia tuples. Sorry for the trouble.

4

No problems at all, sometimes we get blind about our own bugs and can spend way too long on them when a pair of fresh eyes might catch the problem in seconds.