add missing functionality

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Description

Contributor guide

Open the contributing guide

First steps

1. Read the whole issue, then the project's contributing guide.
2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
3. Fork the repository and make your change on a branch.
4. Open a pull request that references the issue number.

More from arrayfire/arrayfire-rb

• Is this something that needs fix or can it be ignored ? Open
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  arrayfire/arrayfire-rb#7 · 1 comment · 1 assignee · Opened Jun 24, 2018

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  arrayfire/arrayfire-rb#6 · 4 comments · 1 assignee · Opened Nov 29, 2017

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