# Why \`eye\` has been deprecated?

**URL:** <https://discourse.julialang.org/t/why-eye-has-been-deprecated/12824>\
**Category:** Internals & Design\
**Created:** [August 2, 2018, 2:12pm UTC](https://discourse.julialang.org/t/why-eye-has-been-deprecated/12824 "2018-08-02T14:12:13Z")\
**Posts on this page:** 1\
**Showing post:** 27

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**Author:** ![Roger-luo](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/roger-luo/32/3399_2.png) [@Roger-luo](https://discourse.julialang.org/u/Roger-luo)\
**Post date:** [August 3, 2018, 7:20am UTC](https://discourse.julialang.org/t/why-eye-has-been-deprecated/12824/27 "2018-08-03T07:20:58Z")

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Why hard-coded `f' = adjoint(f)` is annoying? Is there any example for this?

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_[View the full topic](https://discourse.julialang.org/t/why-eye-has-been-deprecated/12824)._