Ivy astro21
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| ## ruiling@ 07/08/2012 | |
| ## input: | |
| ## x: sample data matrix, d×n | |
| ## d is the dimension of original sample | |
| ## n is the number of samples | |
| ## y: class label vector, n×1 | |
| ## r: reduced dimension | |
| ## metric：type of metric in the embedding space | |
| ## 'weighted' ------ weighted eigenvectors | |
| ## 'orthonormalized' ------ orthonormalized |