# More Chapter 4 issues

**URL:** <https://forums.kodeco.com/t/more-chapter-4-issues/44162>\
**Category:** Metal by Tutorials\
**Created:** [June 30, 2018, 12:11am UTC](https://forums.kodeco.com/t/more-chapter-4-issues/44162 "2018-06-30T00:11:59Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![brianlawson](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/brianlawson/32/81494_2.png) [@brianlawson](https://forums.kodeco.com/u/brianlawson)\
**Post date:** [June 30, 2018, 12:11am UTC](https://forums.kodeco.com/t/more-chapter-4-issues/44162/1 "2018-06-30T00:11:59Z")

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On page 77 the book states that the matrix [-1, 2] has `one column and two rows`. The words column and row should be switched: `1 row and 2 columns`.

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**Author:** ![brianlawson](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/brianlawson/32/81494_2.png) [@brianlawson](https://forums.kodeco.com/u/brianlawson)\
**Post date:** [June 30, 2018, 12:13am UTC](https://forums.kodeco.com/t/more-chapter-4-issues/44162/2 "2018-06-30T00:13:15Z")

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My bad, I see the note just below that tells me Metal used column-major matrices. 🙂

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**Author:** ![caroline](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/caroline/32/111867_2.png) [@caroline](https://forums.kodeco.com/u/caroline)\
**Post date:** [June 30, 2018, 12:14am UTC](https://forums.kodeco.com/t/more-chapter-4-issues/44162/3 "2018-06-30T00:14:10Z")

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@brianlawson - we’re grateful for feedback though 😃

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**Author:** ![brianlawson](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/brianlawson/32/81494_2.png) [@brianlawson](https://forums.kodeco.com/u/brianlawson)\
**Post date:** [June 30, 2018, 1:53am UTC](https://forums.kodeco.com/t/more-chapter-4-issues/44162/4 "2018-06-30T01:53:31Z")

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New issue:

In the section titled **Upgrade the engine** , starting on page 89, we are told to open the Matrices project and run it. The text and illustration on the next page show the train in front view, occupying the entire window width.`Currently, the train takes up the whole screen,…`. What I get is an orthographic projection.

 ![27%20PM](https://raywenderlich-com-v3-forums.s3.amazonaws.com/original/3X/3/0/304802fb3b6110fe70880cb1ff4cf7a77d94b67f.png)

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**Author:** ![caroline](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/caroline/32/111867_2.png) [@caroline](https://forums.kodeco.com/u/caroline)\
**Post date:** [June 30, 2018, 2:15am UTC](https://forums.kodeco.com/t/more-chapter-4-issues/44162/5 "2018-06-30T02:15:25Z")

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@brianlawson - are you running the **Matrices** project from the **starter** directory, not the **final** directory?

When I go to the starter directory, and run the Matrices project, I get the flat train moving back and forth.

(btw, that’s actually a perspective projection in the left hand image - you’ll do orthographic projection in ch 9!)

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**Author:** ![brianlawson](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/brianlawson/32/81494_2.png) [@brianlawson](https://forums.kodeco.com/u/brianlawson)\
**Post date:** [June 30, 2018, 3:30am UTC](https://forums.kodeco.com/t/more-chapter-4-issues/44162/6 "2018-06-30T03:30:02Z")

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I was in the Final folder and not the Starter folder. My Bad once again. Must be time to give it a rest for the night.

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**Author:** ![brianlawson](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/brianlawson/32/81494_2.png) [@brianlawson](https://forums.kodeco.com/u/brianlawson)\
**Post date:** [June 30, 2018, 9:46pm UTC](https://forums.kodeco.com/t/more-chapter-4-issues/44162/7 "2018-06-30T21:46:38Z")

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On Page 116, at the bottom of the page, there is a link to a Wikipedia article about Spectralon. The link wraps at the end of the line. It is broken where it wraps even though the entire URL is underlined as though it was a link. Only the portion before the line wrap works, taking the reader to the Wikipedia home page.

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**Author:** ![mhorga](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/mhorga/32/109017_2.png) [@mhorga](https://forums.kodeco.com/u/mhorga)\
**Post date:** [June 30, 2018, 11:40pm UTC](https://forums.kodeco.com/t/more-chapter-4-issues/44162/8 "2018-06-30T23:40:42Z")

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Thanks, Brian. We’ll update the link for the next release.