吴恩达机器学习machine--learning-ex5

吴恩达机器学习machine–learning-ex5中遇到的问题

为什么执行过程中会出现这样子的警告,请问这是什么造成的呢?
warning: division by zero
warning: called from
fmincg at line 124 column 8
trainLinearReg at line 19 column 7
learningCurve at line 57 column 9
ex5 at line 108 column 24

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