K Nearest Neighbor cluster analysis and prediction

How can write code on matlab to apply kNN function and compute the accuracy over all folds, then average the results?

To compute accuracy, do I check the ratio of test samples whose predicted labels are the same as the ground-truth labels, out of all test samples?

[KALYAN ACHARJYA]

Have you checked here?

[Hanan Awawdeh]

Yes, but I did not understand how to write the code☹

Answer 1

[Image Analyst]

See my attached demo.

To determine accuracy you'd have to know the ground truth labels for your test set, as well as the prediction of them of course. Then just sum up the number of correct predictions and divide by the total number of predictions.