I am trying create a Dictionary from Arrays of Keys and Values julia> id = [1,2,3,4]; julia> coord = [0 0 0;1 0 0;5 3 0;6 5 1]; and I want something like: Dict(id,coord) i.e. julia> X = Dict(1 => [0,0,0], 2 => [1,0,0], 3 => [5,3,0], 4 => [6,5,1]) …

You need: julia> Dict( id .=> [coord[i,:] for i=1:4] ) Dict{Int64,Array{Int64,1}} with 4 entries: 4 => [6, 5, 1] 2 => [1, 0, 0] 3 => [5, 3, 0] 1 => [0, 0, 0] Also, this is faster: julia> Dict( (id[i] => coord[i,:] for i=1:4) ) Dict{Int64,Array{Int64,1}} with 4 entries: 4 => [6, 5, 1] …

One way is Dict(zip(keys, values)).

It would be cool if the documentation had a “cool tricks that are hard to look up in the documentation” documentation page.

Thank you so much for your help. I don’t get an array in the values (julia v0.7) julia> Dict(id .=> coord) Dict{Int64,Int64} with 4 entries: 4 => 1 2 => 0 3 => 0 1 => 0 i.e. Dict{Int64,Array{Int64,1}} with 4 entries: 4 => [6, 5, 1] 2 => [1, 0, 0] 3 => [5, 3, 0] 1 => [0, 0, 0]

You can drop one pair of parens in the latter one.

Yes, this makes it much nicer, thank you.

[image] ExpandingMan: It would be cool if the documentation had a “cool tricks that are hard to look up in the documentation” documentation page. It would have to be called “cool tricks that were hard to look up in the documentation”. :wink:

Create a Dictionary from Arrays of Keys and Values

New to Julia

StefanKarpinski August 23, 2018, 12:50am 3

Or the slick new syntax Dict(ks .=> vs) which simply falls out of broadcasting and the Dict constructor.

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Create a Dictionary from Arrays of Keys and Values

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