matlab - Multivariate Gaussian distribution formula implementation -

-

I have a definite problem when implementing multivariate Gaussian distribution for discrepancy detection.

I have given reference to the formula from Andrew NG 

  http://www.holehouse.org/mlclass/15_Anomaly_Detection.html
< P> Below is the problem I have

Suppose I have a data set with two attributes and the number of training numbers is n = 2 and my polygonal probability p. (X; mu; Sigma) which should be [m * 1] matrix because it has to face the problem

I have to face the problem of matrix [M * ​​1] I am unable to use the formula to produce.

I am using Octave as IDE to develop algorithms.

Below is a snapshot of my problem showing

image description here Keeping the multiplication of the red border equation in mind, because the LHS of the red border is just a real number </ p> <p> <img src =

Please help me understand that I am wrong

thanks

< / Div>

I think you have wrong dimensions.

Assume that you have a 2-dimensional ( n = 2 ) data for the m examples. We will call this data in MATLAB a N-by-m can be stored in the form of matrix (columns are data instances, rows represent the feature / dimension) in this case we have:

  • X size data matrix nxm , each example is x = X (:, i) a vector of size nx1 ( Column vector in our conference).
  • mu mean vector ( mu = means (x, 2) ). It is also a column vector of a size whose example is nx1 .
  • Sigma co-operative matrix ( sigma = COV (x. ') ). Its size is nxn (it describes how each dimension varies with each other's dimensions).

Therefore, the part you have highlighted in red, it involves the following: Size: 

  = ([nx1] - [nx1]) '* [Nxn] * ([nx1] - [nx1]) = [1xn] * [nxn] * [nx1] = 1x1

Comments

Post a Comment

Popular posts from this blog

java - Can't add JTree to JPanel of a JInternalFrame -

-
Image
There are two panels in my JInternalframe. I want to add TopPanel to Jtree to nominate another. But I can not add Jaitari to the top of the panel. Please help me in this piece of code: DefaultMutableTreeNode root = new DefaultMutableTreeNode ("deck"); DefaultMutableTreeNode Item Clubs = New DefaultMutableTreeNode ("Club"); AddAllCard (itemClubs); Root.add (itemClubs); DefaultMutableTreeNode item = New DefaultMutableTreeNode ("Diamonds"); AddAllCard (itemDiamonds); Root.add (itemDiamonds); DefaultMutableTreeNode Itemspads = New DefaultMutableTreeNode ("Spades"); AddAllCard (itemSpades); Root.add (itemSpades); DefaultMutableTreeNode item increases = new DefaultMutableTreeNode ("heart"); AddAllCard (itemHearts); Root.add (itemHearts); Default Trimodel Tree Model = New DefaultTreeModel (Route); Tree = new jetty (tree modal); ScrollPane = new JScrollPane (tree); // scrollPane.setViewportView (tree); . ScrollPane.getViewport () add (tr
Read more

javascript - data.match(var) not working it seems -

-
OK, I have this small block code, which is to scanned a number on the website, but for some reason There is a hip that it is not scanning at all. var regenges = / \ & lt; Span class = "currency-robux" data-to-"item-private-value-price" & gt; ([\ D,]) \ & LT; \ / Span \ & gt; /; Var ValueCiling = Data. Match (reggae); Value-song = number (value slicing location (",", "")); Is there anything wrong with that? This is related to the if statement if (value sling and lieutenant; = price watching) { < P> A function calls to move from there, but for some reason it does not seem to run at all. So I think the Regex is wrong but I'm not sure how. (There is a variable in PriceWinking , this is a snippet from the code.) On the website, I'm trying to remove it. & lt; Span class = "robux" data-plus = "item-privatesale-price" & gt; 115 & lt; / Span & gt; Keep in mind
Read more

javascript - How can I pause a jQuery .each() loop, while waiting for user input? -

-
Before I continue to get a jQuery .each loop to wait for user input There is a problem in repeatedly repeating This is my code (I have commented on what I would like to do): & lt; Html xmlns = "http://www.w3.org/1999/xhtml" & gt; & Lt; Top & gt; & Lt; Link rel = "stylesheet" type = "text / css" href = "common_components.css" /> & Lt; Meta http-equiv = "content-type" content = "text / html; charset = UTF-8" /> & Lt; Link rel = "stylesheet" href = "slider.css" & gt; & Lt ;? Php include_once 'common_components.php'; $ Query = $ dbh- & gt; Queries ("SELECT movies_dir FROM settings"); $ Line = $ query- & gt; Obtain (PDO :: FETCH_ASSOC); Date_default_timezone_set ('UTC'); Echo "& lt; title & gt; movie scanner & lt; / title & gt;"; ? & Gt; & Lt; Script src = "jquery.min.js" & gt; &am
Read more