pca
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{{DavinciWiki_Function| | {{DavinciWiki_Function| | ||
| − | + | Principal Component Analysis | |
| + | |||
| + | Compute the principal components, eigen values and eigen vectors of a numeric array | ||
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| − | Arguments: | + | Arguments: A numeric array and ignore value |
| − | Return Value: | + | Return Value: A structure containing the eigen value and vectors and the rotated data |
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| − | [[Syntax]]: | + | [[Syntax]]: pca(image [, ignore]) |
| + | |||
| + | 'image' - A numeric array | ||
| + | |||
| + | 'ignore' - An optional ignore value for matrix calculations | ||
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| + | dv> a | ||
| + | 600x600x3 array of byte, bip format [1,080,000 bytes] | ||
| + | |||
| + | dv> b=pca(a) | ||
| + | struct, 2 elements | ||
| + | e: 4x3x1 array of float, bsq format [48 bytes] | ||
| + | data: 600x600x3 array of double, bip format [8,640,000 bytes] | ||
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| + | Original Image | ||
| + | |||
| + | [[Image:unfiltered.png|250px]] | ||
| + | |||
| + | Three principal components | ||
| + | |||
| + | [[Image:comp1.png|250px]] [[Image:comp2.png|250px]] [[Image:comp3.png|250px]] | ||
| | | | ||
| + | *[[mxm]] | ||
| + | *[[eigen]] | ||
| + | *[[covar]] | ||
| | | | ||
| + | *[[pca2]] | ||
| | | | ||
| + | [[Media:pca.dvrc|pca()]] | ||
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}} | }} | ||
| − | |||
[[category:Functions]] | [[category:Functions]] | ||
| + | [[category:User Defined Functions]] | ||
[[category:Matrix]] | [[category:Matrix]] | ||
Revision as of 14:10, 28 March 2006
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Contents: Description, Arguments, Usage, Examples, Images, Sub-Functions, Related Functions, Source Supported Under Version: >1.00
Description Principal Component Analysis Compute the principal components, eigen values and eigen vectors of a numeric array
Arguments and Return Values Arguments: A numeric array and ignore value Return Value: A structure containing the eigen value and vectors and the rotated data
Usage Syntax: pca(image [, ignore]) 'image' - A numeric array 'ignore' - An optional ignore value for matrix calculations
Examples dv> a
600x600x3 array of byte, bip format [1,080,000 bytes]
dv> b=pca(a)
struct, 2 elements
e: 4x3x1 array of float, bsq format [48 bytes]
data: 600x600x3 array of double, bip format [8,640,000 bytes]
Images Original Image
Three principal components
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Recent Library Changes Created On: 02-15-2006 |
