# Weights and indices for linear interpolation/extrapolation

**URL:** <https://discourse.julialang.org/t/weights-and-indices-for-linear-interpolation-extrapolation/77580>\
**Category:** Performance\
**Tags:** question, interpolations\
**Created:** [March 8, 2022, 12:10pm UTC](https://discourse.julialang.org/t/weights-and-indices-for-linear-interpolation-extrapolation/77580 "2022-03-08T12:10:05Z")\
**Posts on this page:** 1\
**Showing post:** 14

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**Author:** ![stevengj](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/stevengj/32/71_2.png) [@stevengj](https://discourse.julialang.org/u/stevengj)\
**Post date:** [March 12, 2022, 1:46pm UTC](https://discourse.julialang.org/t/weights-and-indices-for-linear-interpolation-extrapolation/77580/14 "2022-03-12T13:46:11Z")

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> [@fredrikpaues](#):
>
> ```julia
> Implement binary search as
> # `index = searchsortedlast(gridpoints, value)`
> # but with support for tuple gridpoints
> 
> ```

I’m confused, why can’t you use `searchsortedlast`? You almost certainly don’t want to use a tuple to store a long array of grid points.

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