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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"alternative methods of collecting an axis_iter to ndarray matrix","articleBody":"I'm working on a dataframe implementation that provides two-dimensional iterator adaptors over ndarray matrices. \r\n\r\n```\r\npub struct DataFrame {\r\n    pub columns: Vec\u003cOuterType\u003e,\r\n    pub data: Matrix\u003cInnerType\u003e,\r\n    pub index: Vec\u003cOuterType\u003e,\r\n}\r\n```\r\n\r\nThe dataframe's data are an enum over something called `InnerType`, which allows the dataframe to support a variety of types, like dataframes in other languages:\r\n\r\n```\r\npub enum InnerType {\r\n    Float(f64),\r\n    Int64(i64),\r\n    Int32(i32),\r\n    Str(String),\r\n    Empty,\r\n}\r\n```\r\n\r\nThe iterator adaptors `impl Iterator\u003cItem = (OuterType, ArrayView\u003c'a, InnerType, usize\u003e)\u003e`.\r\n\r\nNotice the `InnerType::Str(String)`. Because of this value, `InnerType` is not Copy, and I'm unable to collect the adaptors' items into a DataFrame via `stack`. Can you help me think of another way to collect the iterator adaptor into an ndarray matrix, without needing Copy, so I can support Strings in the dataframe? This problem may also affect implementing something like `FromCSV`, which would go from a CSV reader iterator to a DataFrame.\r\n\r\nIf you want to check out the project further, you can do so here: https://github.com/pegasos1/rust-dataframe","author":{"url":"https://github.com/kernelmachine","@type":"Person","name":"kernelmachine"},"datePublished":"2016-12-14T16:52:33.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":16},"url":"https://github.com/249/ndarray/issues/249"}