# Introduction to the matrix | Matrices | Precalculus | Khan Academy | Summary and Q&A

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February 22, 2013
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Introduction to the matrix | Matrices | Precalculus | Khan Academy

## TL;DR

Matrices are rectangular arrays of numbers that are widely used in computer science for simulations and constructing computer graphics.

## Questions & Answers

### Q: What is a matrix?

A matrix is a rectangular array of numbers used in computer science and computer graphics for simulating and constructing things.

### Q: How are the dimensions of a matrix determined?

The dimensions of a matrix are determined by the number of rows and columns it has. For example, a matrix with 2 rows and 3 columns is called a 2 by 3 matrix.

### Q: What are matrices used for in computer graphics?

Matrices are used in computer graphics to represent information such as color intensity or the presence of an object at a certain point.

### Q: How can matrices be manipulated?

Matrices can be manipulated using algebraic operations like multiplication, addition, and finding the inverse. These operations allow for efficient computation and simulations in various fields.

## Summary & Key Takeaways

• Matrices are rectangular arrays of numbers used in computer science and computer graphics for simulating and constructing things.

• Matrices have rows and columns, and their dimensions are represented as "x by y" where x is the number of rows and y is the number of columns.

• Matrices are valuable for representing information in a compact way and can be manipulated using algebraic operations like multiplication and addition.