How to iterate over two arrays in parallel

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I have two arrays that I want to iterate over at the same time.

I'm using this:

julia> xs = [1,2,3];

julia> ys = [4,5,6];

julia> for i in 1:length(xs)
           x = xs[i]
           y = ys[i]
           @show x, y
       end
(x, y) = (1, 4)
(x, y) = (2, 5)
(x, y) = (3, 6)

Is there a better way to iterate over multiple arrays in Julia?

Use zip along with tuple destructuring:

julia> xs = [1,2,3];

julia> ys = [4,5,6];

julia> for (x, y) in zip(xs, ys)
           @show x, y
       end
(x, y) = (1, 4)
(x, y) = (2, 5)
(x, y) = (3, 6)

zip will stop iteration at the shortest array:

julia> for (x, y) in zip([1,2], [0,0,0])
           @show x, y
       end
(x, y) = (1, 0)
(x, y) = (2, 0)

This pattern can be generalized to an arbitrary number of lists:

julia> for (x, y, z) in zip([1,2], [3,4], [5,6])
           @show x, y, z
       end
(x, y, z) = (1, 3, 5)
(x, y, z) = (2, 4, 6)

Loop over multiple arrays simultaneously, Loop over multiple arrays (or lists or tuples or whatever they're called in your language) Given a parallel iteration utility, we might write this: For better understanding of iteration of multiple lists, we are iterating over 3 lists at a time. We can iterate over lists simultaneously in ways: zip() : In Python 3, zip returns an iterator. zip() function stops when anyone of the list of all the lists gets exhausted.

How To Iterate Over Two (or More) Lists at the Same Time, sets that needed to be jointly computed or displayed, then you probably have experienced the pain of iterating over multiple lists in parallel. Use the zip() method to process the two arrays in parallel. var res = val.Zip(str, (n, w) => new { Number = n, Word = w }); The above fetches both the arrays with int and string elements respectively.

You can iterate over multiple collections using map and foreach. For example, with map:

julia> x, y = 1:3, 4:6;

julia> map(hypot, x, y)
3-element Array{Float64,1}:
 4.123105625617661
 5.385164807134504
 6.708203932499369

For more complicated multi-line anonymous functions, you can use do-block syntax:

julia> xs, ys = 1:4, 10:10:40;

julia> map(xs, ys) do x, y
           if isodd(x)
               x + y
           else
               x * y
           end
       end
4-element Array{Int64,1}:
  11
  40
  33
 160

foreach is very similar to map, but is intended for use when a function is applied for its side effect, like printing or plotting, rather than its return value. An example with foreach:

julia> x, y = ["a", "b", "c"], 1:3;

julia> foreach(println ∘ ^, x, y)
a
bb
ccc

Note the use of the function composition operator in the foreach call.

Looping Through Multiple Lists - Python Cookbook [Book], Looping Through Multiple Lists Credit: Andy McKay Problem You need to loop map , with a first argument of None , you can iterate on both lists in parallel: Here, you iterate through dict_one and dict_two in parallel. In this case, zip() generates tuples with the items from both dictionaries. Then, you can unpack each tuple and gain access to the items of both dictionaries at the same time.

Loop Over Two Arrays In Parallel? : rakulang, I have two arrays of the same length, they both contain roughly 560 elements each. I want to loop over both of them at the same time and� # iterating over array . import numpy as geek # creating an array using # arrange method . a = geek.arange(9) # shape array with 3 rows # and 4 columns .

How to iterate through two arrays at once?, Is it possible to iterate through two arrays in a for loop? I tried the following code but I does not compile: let a = [0, 1, 2, 3, 4]; let mut b = [0; 4]; for (ai, bi) in (a.iter(), � To process an array in your logic app, you can create a "Foreach" loop. This loop repeats one or more actions on each item in the array. For limits on the number of array items that "Foreach" loops can process, see Limits and configuration. To repeat actions until a condition gets met or a state changes, you can create an "Until" loop. Your

Not using zip() to iterate over a pair of lists — Python Anti-Patterns , This is a common way for iterating through two lists, but it is not the preferred way in Python. numbers = [1, 2, 3]� Original array is: [[ 0 5 10 15] [20 25 30 35] [40 45 50 55]] Modified array is: 0 5 10 15 20 25 30 35 40 45 50 55 Example 2. The order of iteration is chosen to match the memory layout of an array, without considering a particular ordering. This can be seen by iterating over the transpose of the above array.

Comments
  • If you only need the values, zip is nicest; if you need the indexes, try the eachindex solution below.