Imagine I have type T x::Array{Float64,1} f::Array{Float64,1} T()=new(zeros(3),zeros(2)) end v=Array{T}(10) I would then like to write something like x1[1:10]=v[1:10].x[1] this doesn’t work because “type Array has no field x”. I can certainly extract all the x[1] from the individual me…

v=Array{T}(10) Note that this doesn’t create any T objects (elements of v are #undef). You probably want v = [T() for _ = 1 : 10] Then to get the x1s you can do e.g. map(t -> t.x[1], v) or (t -> t.x[1]).(v)

Interestingly, this is a good example of why the Array constructors have been changed in 0.7. In 0.7, to declare v the way you did you’d have to explicitly do v = Array{T}(undef, 10)

v = Array{T}(undef, 10) Fixed that for you :slight_smile:

Oh god, did this seriously just get changed? I had done so much inserting of uninitialized… When did this happen?

https://github.com/JuliaLang/julia/pull/26316 Search and replacing `uninitialized´ should be fairly easy though. Took me only a few minutes for whole of Base.

Well, not sure I would have voted for undef but uninitialized is definitely one of the hardest words to type in the English language, so I’m not complaining.

Yes, I knew that my elements of v are #undef, just wanted to keep the description to a minimum. The interesting part for me was the map(t → t.x[1], v) Thanks! (for all the help I am receiving here I owe you all beer/coffee/whatever… ring a bell if you ever come to Padua/Venice, Italy)

By the way, all of the suggestions here are good ones, but it’s worth noting that they’re all just helpful shortcuts for extracting each x element in a loop. One of the nicest things about Julia is that your first instinct (“extract all the x[1] from the individual members of the array v and put the…

This is a lengthy thread, but you might find the discussion interesting [image] Get values of symbols inside a function General Usage Hi guys! I have one problem: if I have an array of symbols, how can I get their values inside a function scope? Something like this: func…

Extract vector of values from vector of T

New to Julia

baggepinnen March 14, 2018, 5:31am 10

This is a lengthy thread, but you might find the discussion interesting

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Extract vector of values from vector of T

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