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

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ferda sonmez 2019-3-21

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回答： ferda sonmez 2019-3-31

采纳的回答： ferda sonmez

matrix_values.txt

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

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madhan ravi 2019-3-22

error_of_hidden_layer2 ?

ferda sonmez 2019-3-22

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

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采纳的回答

ferda sonmez 2019-3-31

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/451537-elementwise-multiplication-of-two-matrices-which-does-not-contain-nan-elements-results-a-matrix-with#answer_368285

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