parse an array of string to a matrix of Int

user_14150686 0
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I'm using Julia.

When parsing a string to Int,
parse.(Int,split(readline())) works (e.g. input:""123 456"" → output:[123,456]),

but parse.(Int,split(readlines())) doesn't. How should I do?

I know each parse.(Int,split(readlines()[i])) passes, but I want to parse at one try something like parse.(Int,split(readlines())).

julia arrays split
2 Answers

Perhaps the nicest way would be by using DelimitedFiles such as:

julia> open("f.txt", "w") do f; println(f,"1 2 3\n4 5 6"); end

julia> using DelimitedFiles

julia> readdlm("f.txt",Int)
2×3 Matrix{Int64}:
 1  2  3
 4  5  6

Something more similar to your code could look like this:

julia> map(row -> parse.(Int,row), split.(readlines("f.txt")))
2-element Vector{Vector{Int64}}:
 [1, 2, 3]
 [4, 5, 6]
user_99577100

The easiest way would be to use the DelimitedFiles package from the Julia standard library:

julia> readdlm(stdin, Int)
1 23 4 
6 83 23
2×3 Matrix{Int64}:
 1  23   4
 6  83  23

(the second and third lines are user input by me.)

If you're reading from a file (readline("myfile.txt") in the original code), you can pass the filename instead of stdin (readdlm("myfile.txt", Int)).

sundar_81270
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