Sub (and Add, Div, etc) not implemented for ArrayView/ViewRepr?

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4/5
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3-5 天
新手友好度
30/100
Issue 类型
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基本清楚
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停滞
技术栈
rust
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data

调研方向

The issue names ArrayView and ViewRepr, along with the Sub, Add, and Div binary operations; no files or tests are identified. Start by locating the operator implementations and related broadcasting handling, then check how views are used on the left-hand side. Done means the requested binary operations work with read-only views without consuming the source array.

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描述

First off, very impressed with this crate so far. I'm a long-time numpy user and I appreciate the task you took on on behalf of the Rust ecosystem.

I only recently started using Rust, so I might just be trying to do the wrong thing here, but I'm curious why an ArrayView can not be used on the LHS of a binary operation like +, -, etc. That seems like a natural use-case, since you need a read-only view of the data in the array but won't be modifying it.

In my case I'd like to compare an array of values to a particular query by broadcasting and then operate on the matching rows later–this means I can't consume the array in this operation*.

Is the appropriate thing to Zip over the rows and compare them that way? I can see how to do that but it seemed verbose, so I thought I'd check. And if this is an oversight I can try to help implement a PR.

* a broadcasting comparison operator would be even better for this but the existence of #35 suggests that might be difficult.

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