# Math Help - Matrix operation?

1. ## Matrix operation?

I'm not really sure how to approach this equation. Do the square brackets indicate a matrix? H(x) is just a vector of probabilities. What operation would I do first? i.e. would I end up with 1 figure, or a vector the same length as H(x)?

$t = \sqrt{ \ln \lbrack \frac {1}{(H(x))^2} \rbrack }$

Thanks for any help

2. It is a bit ambiguous. I think they mean element-by-element, though, i.e.,

$t= \left[\sqrt{\log{(\frac{1}{x_1^2})}},\sqrt{\log{(\frac{1 }{x_2^2})}},.....,\sqrt{\log{(\frac{1}{x_n^2})}}\r ight]$

3. ## Gamma function

Yes that seems to work... Thank you!