tmp/tmp91u3_s7d/{from.md → to.md}
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#### Swap matrix or vector elements <a id="linalg.algs.blas1.swap">[[linalg.algs.blas1.swap]]</a>
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``` cpp
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template<inout-object InOutObj1, inout-object InOutObj2>
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void swap_elements(InOutObj1 x, InOutObj2 y);
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template<class ExecutionPolicy, inout-object InOutObj1, inout-object InOutObj2>
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void swap_elements(ExecutionPolicy&& exec, InOutObj1 x, InOutObj2 y);
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```
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[*Note 1*: These functions correspond to the BLAS function
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`xSWAP`. — *end note*]
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*Constraints:* `x.rank()` equals `y.rank()`.
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*Mandates:* For all `r` in the range [0, `x.rank()`),
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``` cpp
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compatible-static-extents<InOutObj1, InOutObj2>(r, r)
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```
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is `true`.
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*Preconditions:* `x.extents()` equals `y.extents()`.
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*Effects:* Swaps all corresponding elements of `x` and `y`.
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