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{"@context":"https://schema.org","@type":"QAPage","mainEntity":{"@type":"Question","name":"How to properly use join_many?","text":"
join_many requires the use of Vec::<&Array<T>> to do the array joining.  To do so, I need to create another vector  Vec::<Array<T>> to store the arrays first before joining.
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Can the array be joined from  Vec::<Array<T>> directly without converting it to Vec::<&Array<T>>?
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use arrayfire::*;\nfn main() {\n\n    let mut vs = Vec::<Array<i32>>::new();\n    let mut v2s = Vec::<&Array<i32>>::new();\n    for i in 0..10{\n        let a = range::<i32>(dim4!(4), 0) * i;\n        vs.push(a);\n    }\n    for i in 0..10{\n        v2s.push(&vs[i]);\n    }\n    let v3 = join_many(1, v2s);\n    print(&v3);\n}\n
","upvoteCount":1,"answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"
@3togo Perhaps join_many macro is what you are looking for ? It takes care of creating the vector out of Array references and passing it down to join function for you.
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The reason most APIs of arrayfire-rust crate have Array& as arguments to enable reuse of the same memory for multiple operations. Otherwise, Array would be consumed by the first join_many and the original array can't be reused without a clone operation which is not free of cost always.
","upvoteCount":2,"url":"https://github.com/arrayfire/arrayfire-rust/discussions/344#discussioncomment-3618553"}}}