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Tutor profile: Noah S.

Noah S.
Graduate Student Instructor for UC Berkeley. I would love to help people in CS or Math!

Questions

Subject:Linear Algebra

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Question:

List five equivalent conditions for invertible matrices.

Noah S.

1, The matrix has full rank. 2. 0 is not an eigenvalue of the matrix. 3. The transpose of the matrix is invertible. 4. The matrix can be expressed as a product of elementary matrices. 5. The matrix has n pivot positions, where n is the dimension of the matrix.

Subject:Java Programming

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Question:

Give an example of a Class v.s. an Object (instance of a class)

Noah S.

A human being. HumanBeing is my class. It contains the universal structure that all humans have. While John is an Object, an instance of the class HumanBeing. HumanBeing might have an empty method for height(), and John overrides it with his own height(), which could return 5'2.

Subject:Human-computer Interaction

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Question:

What is an example of a platform that encompasses Low Floor, Wide Wall, and High Ceiling design?

Noah S.

Unity. Unity has a UI that allows entry-level programmers to understand how to make something with it, plus the platform is free for all games that make less than \$100K / year. So the UI and the price both make Unity have Low Floors. Second, Unity has several different ways to achieve the same feature (if you want to scale an object, you can scale it in the Inspector, or in the code, or in the display). These diverse features gives Unity Wide Walls. Lastly, Unity has a lot of extra details that, once mastered, can improve your games considerably, and help someone scale up their project. Thus Unity has High Ceilings.

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