@mswsim Hey! I figured it out, but for some reason youtube is being a jerk and won't let me post anything complicated. I'll try to get it up by another means and link to it in a couple of minutes.
@godfreybold the (x-u) matrix given in blue and the M=5; just calculate the average of the matrix multiplications: 1/M * sum( transpose(x-u) * (x-u) )
you should really start explaining things better
bgrgyk 3 months ago
Heh… I wonder how many other people just got the first two right?
WaterpigMaster 3 months ago
This has been flagged as spam show
that T in the eq. is for transpose. Look up and then transpose (x-u) and get a 2 by 5 matrix: Row1= -2 -1 0 1 2 Row2= 3 2 0 -2 -3
that's your (x-u)^T. Multiple that with regular (x-u)
look up how to multiply 1 matrix by another and do [ (x-u)^T * (x-u) ]
If you do it properly you end with a 2 by 2 matrix: Row1= 10 -16 Row2= -16 26
Multiply that with 1/M using matrix rules and end with another 2 by 2 matrix: Row1= 10/5 -16/5 Row2= -16/5 26. Corresponds to those 4 boxes for sigma
arrcticwolf 3 months ago
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arrcticwolf 3 months ago
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arrcticwolf 3 months ago
You need some concepts about matrices (matrix multiplication and transpose of a matrix) to be able to solve and understand this.
joackie27 4 months ago
i still can't figure this out. could some walk me through all the steps.
mswsim 4 months ago
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godfreybold 4 months ago
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godfreybold 4 months ago
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godfreybold 4 months ago
@mswsim Hey! I figured it out, but for some reason youtube is being a jerk and won't let me post anything complicated. I'll try to get it up by another means and link to it in a couple of minutes.
godfreybold 4 months ago
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godfreybold 4 months ago
@mswsim Ok I made a document about it and linked to it on my twitter @kateprevite
godfreybold 4 months ago
your twitter where?
ArKaNeSSS 4 months ago
@ArKaNeSSS my twitter name is @kateprevite. Go to twitter.com and search for it at the top.
godfreybold 4 months ago
Could someone who understands this please explain how to find sigma? I don't understand and unfortunately he sort of glosses over it. Please help!
godfreybold 4 months ago
@godfreybold the (x-u) matrix given in blue and the M=5; just calculate the average of the matrix multiplications: 1/M * sum( transpose(x-u) * (x-u) )
stromaster 4 months ago