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I would like to know how do I reconstruct the data using only the first principal component of the PCA?

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  • $\begingroup$ You can't. PCA is a dimension reduction technique. It discards information. You can only recover the original data if you have all principal components. $\endgroup$ Commented Nov 7, 2015 at 14:09
  • $\begingroup$ I meant..reconstruct the data using only the first principal component..it'll not be the original data..but a "version" of it using the 1PC $\endgroup$ Commented Nov 7, 2015 at 14:37

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