issymetric

- [Instructor] Matrix math is a complex topic, … and I'm not going to try to explain matrix math … or why you'd need to use it. … If you're using it, you understand it. … The good thing is, is that R provides a rich set of tools … for doing matrix math. … One of them is the ability to find out … if a matrix is symmetrical. … Let's take a look at how issymetric works. … In line three, I create a test matrix. … Let's take a look at that matrix. … In column one, I have one, … and in column one, row two, I have two, … in column two I have three, … and then column two, row two, I have four. … Now, is that symmetrical? … In line five, I ask the question issymetric … to test the matrix, and it comes back … and says, no, that's not. … Well, what does a symmetrical matrix look like? … And in line seven, I've gone ahead and defined one. … You can look at it here, there it is, zero-one-one-zero. … In line nine, I use issymetric on test matrix … to check is test matrix symmetrical? … And issymetric comes back and says, yes, …