Linear algebra: best fit line: method of least squares by hand
The tutor shows a nice trick to obtain a least squares line using matrix algebra. In …
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linear algebra
Linear algebra: matrix multiplication: no cancellation rule
The tutor gives an example to show that with matrices, AB=AC doesn’t mean B=C. Consider the …
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Linear algebra: projecting a vector along another one, matrix method.
The tutor shows an example of a projection from one dimension into another. Let’s imagine we …
Linear algebra: projecting a vector along another one, matrix method. Read more →
Linear algebra: cofactors, signed minors
The tutor defines cofactor (aka signed minor) with an example. In my post from Nov 24, …
Spreadsheets: finding the determinant of a matrix using Excel
The tutor tells how to have Excel evaluate a determinant for you. Here’s how: Key in …
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Linear Algebra: solving a three-variable linear system with Excel or LibreOffice Calc
The tutor shows an example of how to solve a system of three equations using a …
Linear Algebra: solving a three-variable linear system with Excel or LibreOffice Calc Read more →
Spreadsheets: Matrix inverse on Excel or LibreOffice Calc
The MINVERSE() function can be tricky to use; the tutor tells how. Example: find the inverse …
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Linear algebra: Matrix multiplication
The tutor demonstrates the technique of multiplying matrices. To go further with Markov chains (introduced in …
Math: Solving systems of equations: Cramer’s Rule
Tutoring high school math, I don’t see this used. However, I did see it at university. …
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Linear algebra: more on determinants
Following up on yesterday’s post, the tutor continues about determinants. Tutoring university math or natural sciences, …