### 2 videos in "Projections / Least Squares"

## Projections onto Subspaces and Least Squares projection matrix

Projections onto Subspaces and Least Squares projection matrix

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Part of video series Linear Algebra Course acquired through MIT OpenCourseWare

Gilbert Strang, 18.06 Linear Algebra, Spring 2005. (Massachusetts Institute of Technology: MIT OpenCourseWare), http://ocw.mit.edu (Accessed November 22, 2008). License: Creative Commons BY-NC-SA.

More info at: http://ocw.mit.edu/terms

More info at: http://ocw.mit.edu/terms

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Projections onto Subspaces and Least Squares projection matrix -- Lecture 15. Learn what a projection is in Linear Algebra and how to compute a projection.

- Least Squares Java Applet - Java applet to play around with to investigate Least Squares lines / equations.
- Least Squares Java Applet 2 - Another interactive Least Squares java applet to play around with.

- What does it mean to project a vector onto another vector?
- How do you compute a projection matrix?
- Why do you project a vector or matrix?

This lesson explains what a projection is and how to find the projection vector. A very important lesson in the grand scheme of Linear Algebra, and very well-taught.