## how to use it
put it in matlab, and use it.
```matlab
============= how to use LDA =====================
Input && Target is Matrix we know it's target.
W = LDA( Input, Target);
Data = Input*W;
Data is dimension-reduced by LDA.
==================================================
```
```matlab
============= how to use KNN =====================
Data is the test Matrix. We get it target by knn.
Input && Target is Matrix we know it's target.
k is the most nearst k neighbour.
Result = KNN( Data, Input, Target, k);
==================================================
```
