What comes after sorting eigenvalues in PCA?

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Shahd Ewawi
Shahd Ewawi on 15 Oct 2015
Edited: Shahd Ewawi on 15 Oct 2015
I'm a student, I have to build PCA from scratch using Matlab on iris data. Iris data have 4 features i want to reduce them to 2. I reached the sorting of eigenvalues step. What is the next step?

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