Hi all,
I have no idea how this happened, but I am using a dataset where in the file, arrays were actually stored as strings like this:
"[1, 2, 3, 4, 5]"
How do I best convert the above into an actual array of integer values?
Thanks!
~ tcp 
julia> str = "[1, 2, 3, 4, 5]";
julia> parse.(Int, split(chop(str; head=1, tail=1), ','))
5-element Vector{Int64}:
1
2
3
4
5
8 Likes
This is great - I really like your solution. For completeness, here is another solution I found from user Anand Jain:
julia> @benchmark (Meta.parse($str) |> eval)
BenchmarkTools.Trial:
memory estimate: 2.58 KiB
allocs estimate: 40
--------------
minimum time: 104.374 μs (0.00% GC)
median time: 109.657 μs (0.00% GC)
mean time: 117.397 μs (0.00% GC)
maximum time: 899.178 μs (0.00% GC)
--------------
samples: 10000
evals/sample: 1
And here is the timing of yours @fredrikekre :
julia> @benchmark parse.(Int, split(chop($str; head=1, tail=1), ','))
BenchmarkTools.Trial:
memory estimate: 304 bytes
allocs estimate: 3
--------------
minimum time: 672.151 ns (0.00% GC)
median time: 703.967 ns (0.00% GC)
mean time: 738.335 ns (2.35% GC)
maximum time: 32.701 μs (97.49% GC)
--------------
samples: 10000
evals/sample: 152
2 Likes
Regex is usually used for this task, for example:
parse.(Int,split(replace(str, r"[^0-9.]"=>" ")))
A variant of @fredrikekre’s solution using strip instead of chop:
parse.(Int,split(strip(str,['[',']']), ","))
I have a very similar problem. I want to copy a color scheme from colorbrewer2.org and convert it to RGB colors.
I can copy&paste the Colors for this scheme as a JS array, which gives one of the following
['#edf8fb','#b2e2e2','#66c2a4','#238b45']
['rgb(237,248,251)','rgb(178,226,226)','rgb(102,194,164)','rgb(35,139,69)']
I know Julia already has a Colorbrewer palette, but the website is much more convenient.
How would I convert this?
@StatisticalMouse, would this work for your use case:
str = "['rgb(237,248,251)','rgb(178,226,226)','rgb(102,194,164)','rgb(35,139,69)']"
s2 = replace.(split(str,"rgb"),r"[^0-9.]"=>" ")[2:end]
[parse.(Int, split(s)) for s in s2]
4-element Vector{Vector{Int64}}:
[237, 248, 251]
[178, 226, 226]
[102, 194, 164]
[35, 139, 69]
1 Like
It works! This produces the colors in the input:
str = "['rgb(255,255,204)','rgb(255,237,160)','rgb(254,217,118)','rgb(254,178,76)','rgb(253,141,60)','rgb(252,78,42)','rgb(227,26,28)','rgb(189,0,38)','rgb(128,0,38)']"
z = @chain str begin
replace.(split(_,"rgb"),r"[^0-9.]"=>" ")[2:end]
[parse.(Int, split(s)) for s in _]
(c->RGB(c[1]/255,c[2]/255,c[3]/255)).(_)
end
3 Likes