Course 1, Week 3 programming assignment

I am getting this error, although I have used the correct formula. Help me !

I solved it. I forget to use

The reason it fails is that you have not used the correct formula. “*” means “elementwise” multiply, but you need dot product style multiply there. My guess is that you just need an explanation of the notation that Prof Ng uses for multiplication. Here’s a thread which goes through all that in detail. Please have a look and let us know if any further questions after reading that.

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Thank you so much. That was a great explanation.