machine learning online test 4 questions and my answer.

machine-learning-ex4
machine-learning-ex4\ex4
machine-learning-ex4\ex4\checkNNGradients.m
machine-learning-ex4\ex4\computeNumericalGradient.m
machine-learning-ex4\ex4\debugInitializeWeights.m
machine-learning-ex4\ex4\displayData.m
machine-learning-ex4\ex4\ex4.m
machine-learning-ex4\ex4\ex4data1.mat
machine-learning-ex4\ex4\ex4weights.mat
machine-learning-ex4\ex4\fmincg.m
machine-learning-ex4\ex4\lib
machine-learning-ex4\ex4\lib\jsonlab
machine-learning-ex4\ex4\lib\jsonlab\AUTHORS.txt
machine-learning-ex4\ex4\lib\jsonlab\ChangeLog.txt
machine-learning-ex4\ex4\lib\jsonlab\jsonopt.m
machine-learning-ex4\ex4\lib\jsonlab\LICENSE_BSD.txt
machine-learning-ex4\ex4\lib\jsonlab\loadjson.m
machine-learning-ex4\ex4\lib\jsonlab\loadubjson.m
machine-learning-ex4\ex4\lib\jsonlab\mergestruct.m
machine-learning-ex4\ex4\lib\jsonlab\README.txt
machine-learning-ex4\ex4\lib\jsonlab\savejson.m
machine-learning-ex4\ex4\lib\jsonlab\saveubjson.m
machine-learning-ex4\ex4\lib\jsonlab\varargin2struct.m
machine-learning-ex4\ex4\lib\makeValidFieldName.m
machine-learning-ex4\ex4\lib\submitWithConfiguration.m
machine-learning-ex4\ex4\nnCostFunction.m
machine-learning-ex4\ex4\predict.m
machine-learning-ex4\ex4\randInitializeWeights.m
machine-learning-ex4\ex4\sigmoid.m
machine-learning-ex4\ex4\sigmoidGradient.m
machine-learning-ex4\ex4\submit.m
machine-learning-ex4\ex4.pdf

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