# Dragon Notes

UNDER CONSTRUCTION
Latest content:
 Feb 20 Regression - Data Science Feb 19 +Classification - ML Feb 18 Control Design - Control Sys. Feb 16 Solved Problems - Data Sci. Feb 12 +Control Systems - MATLAB Feb 10 Image Recognition - Digits:ML Algorithms

# Machine Learning:Method Comparison

 Gradient Descent Normal Equation – Need to choose $$\alpha$$+ – Needs many iterations+ + Computing steps required $$\prop O(n^2)$$ + Works well when $$n$$ is large + Wide real-world problem applicability + No need to choose $$\alpha$$ + No iterations involved – Computing steps required $$\prop O(n^3)$$+ – Slow if $$n$$ is large+ – Limited real-world applicability+