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first hg version after svn
| author | wolffd |
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| date | Tue, 10 Feb 2015 15:05:51 +0000 |
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| rev | line source |
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| wolffd@0 | 1 <html> |
| wolffd@0 | 2 <head> |
| wolffd@0 | 3 <title> |
| wolffd@0 | 4 Netlab Reference Manual dist2 |
| wolffd@0 | 5 </title> |
| wolffd@0 | 6 </head> |
| wolffd@0 | 7 <body> |
| wolffd@0 | 8 <H1> dist2 |
| wolffd@0 | 9 </H1> |
| wolffd@0 | 10 <h2> |
| wolffd@0 | 11 Purpose |
| wolffd@0 | 12 </h2> |
| wolffd@0 | 13 Calculates squared distance between two sets of points. |
| wolffd@0 | 14 |
| wolffd@0 | 15 <p><h2> |
| wolffd@0 | 16 Synopsis |
| wolffd@0 | 17 </h2> |
| wolffd@0 | 18 <PRE> |
| wolffd@0 | 19 d = dist2(x, c) |
| wolffd@0 | 20 </PRE> |
| wolffd@0 | 21 |
| wolffd@0 | 22 |
| wolffd@0 | 23 <p><h2> |
| wolffd@0 | 24 Description |
| wolffd@0 | 25 </h2> |
| wolffd@0 | 26 <CODE>d = dist2(x, c)</CODE> takes two matrices of vectors and calculates the |
| wolffd@0 | 27 squared Euclidean distance between them. Both matrices must be of the |
| wolffd@0 | 28 same column dimension. If <CODE>x</CODE> has <CODE>m</CODE> rows and <CODE>n</CODE> columns, and |
| wolffd@0 | 29 <CODE>c</CODE> has <CODE>l</CODE> rows and <CODE>n</CODE> columns, then the result has |
| wolffd@0 | 30 <CODE>m</CODE> rows and <CODE>l</CODE> columns. The <CODE>i, j</CODE>th entry is the |
| wolffd@0 | 31 squared distance from the <CODE>i</CODE>th row of <CODE>x</CODE> to the <CODE>j</CODE>th |
| wolffd@0 | 32 row of <CODE>c</CODE>. |
| wolffd@0 | 33 |
| wolffd@0 | 34 <p><h2> |
| wolffd@0 | 35 Example |
| wolffd@0 | 36 </h2> |
| wolffd@0 | 37 The following code is used in <CODE>rbffwd</CODE> to calculate the activation of |
| wolffd@0 | 38 a thin plate spline function. |
| wolffd@0 | 39 <PRE> |
| wolffd@0 | 40 |
| wolffd@0 | 41 n2 = dist2(x, c); |
| wolffd@0 | 42 z = log(n2.^(n2.^2)); |
| wolffd@0 | 43 </PRE> |
| wolffd@0 | 44 |
| wolffd@0 | 45 |
| wolffd@0 | 46 <p><h2> |
| wolffd@0 | 47 See Also |
| wolffd@0 | 48 </h2> |
| wolffd@0 | 49 <CODE><a href="gmmactiv.htm">gmmactiv</a></CODE>, <CODE><a href="kmeans.htm">kmeans</a></CODE>, <CODE><a href="rbffwd.htm">rbffwd</a></CODE><hr> |
| wolffd@0 | 50 <b>Pages:</b> |
| wolffd@0 | 51 <a href="index.htm">Index</a> |
| wolffd@0 | 52 <hr> |
| wolffd@0 | 53 <p>Copyright (c) Ian T Nabney (1996-9) |
| wolffd@0 | 54 |
| wolffd@0 | 55 |
| wolffd@0 | 56 </body> |
| wolffd@0 | 57 </html> |