Elementwise multiplication of two matrices which does not contain NaN elements Results a matrix with lots of Nan Values

Hi,

I have a matrix multiplication. First matrix is input_of_hidden_layer2 second matrix is error_of_hidden_layer2.

Before multiplication I check the number of NAn values in the matrixes as below:

result1 = sum(isnan(input_of_hidden_layer2(:)));

result2 = sum(isnan(error_of_hidden_layer2(:)));

disp("result1 " + result1);

disp("result2 " + result2);

I also print the matrix values.

This is the multiplication

delta2 = vpa(((input_of_hidden_layer2>0).*error_of_hidden_layer2),150);

The resulting matrix delta2 is a (30,1) matrix and contains 14 NaN values. There is no Inf value, there is no division. I think this is nonsense. Please help me to understand and fix this problem.

I attached the matrix values in a separate file for you to check.

Best Regards,

Ferda

[dpb]

I don't have symbolic TB but this has to be related to something in the conversion...

[ferda sonmez]

Hi dpb,

Thank you for your interest. Which conversation are you talking about? Can you please explain.

Ferda

[madhan ravi]

error_of_hidden_layer2 ?

[ferda sonmez]

I uploaded the matrixes. The matrix named error_of_hidden_layer2 did not include any NaN values.

Answer 1

[ferda sonmez]

Hi,

The problem was the matrixes didn't store double values but they were symbolic for some reason. The problem was not related to elementwise multiplication. I casted all the matrixes to double prior to this operation.

Best Regards,

Ferda Özdemir Sönmez