knn example with digit recognition

10_knn/README.md

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+## Digit recognition with knn
+
+Here's some example Matlab code that shows KNN in action to guess handwritten digits. Here's what the output looks like:
+
+![](/images/16_correct_500_comparisons.tif)
+
+Each row represents a guess. The last column contains the image that we're trying to guess the digit for. The first three columns show the 3 nearest neighbors for that last image.
+
+Images with boxes around them represent images that we did not guess correctly. You can see KNN works pretty well -- with just 500 comparison images we are getting 80% accuracy. This jumps to 90% with 5000 comparison images (see the images/ directory).
+
+[Uses the MNIST dataset](http://yann.lecun.com/exdb/mnist/)