# QR decomposition with julia. How to?

**URL:** <https://discourse.julialang.org/t/qr-decomposition-with-julia-how-to/92508>\
**Category:** New to Julia\
**Tags:** question\
**Created:** [January 4, 2023, 1:23pm UTC](https://discourse.julialang.org/t/qr-decomposition-with-julia-how-to/92508 "2023-01-04T13:23:31Z")\
**Posts on this page:** 1\
**Showing post:** 8

<div class="post-metadata">

**Author:** ![jcbritobr](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/jcbritobr/32/219275_2.png) [@jcbritobr](https://discourse.julialang.org/u/jcbritobr)\
**Post date:** [January 4, 2023, 2:46pm UTC](https://discourse.julialang.org/t/qr-decomposition-with-julia-how-to/92508/8 "2023-01-04T14:46:39Z")

</div>

Solved here

```julia
X, Y = df.x, df.y;
X1 = [X ones(length(X))];
QR = qr(X1);

(inv(QR.R) * QR.Q') * Y

```

```plaintext
 1.9393939393939394
 4.733333333333333

```

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