Does pca apply on one dimension data?

I need to get significant data in vector contain 300*1 values

Answer 1

[Image Analyst]

It's called Principal Components Analysis. If you have only one component - your signal value in your 1-D array - then how could you have multiple components? You can't - you have only one.

That said, you may well have significant data in there, like the elements have either high or low values, and not many with in between values. But you wouldn't really call the high and low values "components".