# Non-allocating A / B where A and B are matrices

**URL:** <https://discourse.julialang.org/t/non-allocating-a-b-where-a-and-b-are-matrices/21532>\
**Category:** General Usage\
**Created:** [March 6, 2019, 12:30pm UTC](https://discourse.julialang.org/t/non-allocating-a-b-where-a-and-b-are-matrices/21532 "2019-03-06T12:30:50Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Tamas\_Papp](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/tamas_papp/32/25949_2.png) [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Post date:** [March 6, 2019, 12:41pm UTC](https://discourse.julialang.org/t/non-allocating-a-b-where-a-and-b-are-matrices/21532/2 "2019-03-06T12:41:28Z")

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> [@zsoerenm](#):
>
> I know that there is a function `rdiv!` but I am struggling to use it correctly

Please read the help, eg `?rdiv!`, and if that is not enough provide a self-contained example of how you are trying to use it and what goes wrong.

> [@Please read: make it easier to help you](https://discourse.julialang.org/t/psa-make-it-easier-to-help-you/14757):
>
> Welcome to the Julia Discourse! We are enthusiastic about helping Julia programmers, both beginner and experienced. This public service announcement (PSA) outlines best practices when asking for help. Following these points makes it easier for us to help you and more likely you’ll get a prompt, useful answer. Keywords are highlighted to make it easier to refer to specific points. Choose a descriptive title that captures the key part of your question, eg “plots with multiple axes” instead of …

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