Bug with Elementwise.Pow

[MarcosRodMun]

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Issue description

double[] v = new double[] {1, -2, 3, 4}; ElementWise.Pow(v,1); //returns {1 2 3 4}

There seems to be an unnecessary "Math.Abs()" in the Pow operation.

[gwguerrilla]

Agree, and if you try and use ElementWise.SignedPow instead this is what happens.

double[] v = new double[] {1, -2, 3, 4}; ElementWise.SignedPow(v,1); //returns {1 -2 3 4}

Which is correct but this happens

double[] v = new double[] {1, -2, 3, 4}; ElementWise.SignedPow(v,2); //returns {1 -4 9 16}

So currently there is no element-wise power function that works without knowing the answer for each element in the matrix/vector. The only workaround is to manually cycle through each element of the matrix/vector and perform the element-wise power operation yourself.