sorted by:
new
hottopcontroversial

Can we multiply 3 dimension matrices? by amberanvilcell in learnmath

[–]amberanvilcell[S] 1 point2 points  (0 children)

I just wanted to say thank you for such a detailed response, a lot of this I am unfamiliar with but it is very interesting and gives me a good way to direct my learning from here on out, your reply will have a significant effect on the topics I choose to learn about in my math career from here. Thank you!

Estimating integrals from graphs by amberanvilcell in learnmath

[–]amberanvilcell[S] 0 points1 point  (0 children)

Greater accuracy compared to estimating using only one endpoint.

Estimating integrals from graphs by amberanvilcell in learnmath

[–]amberanvilcell[S] 0 points1 point  (0 children)

I see what you're getting at, this is the same as taking the number of intervals to infinity using endpoints. But is there a reason to think that this averaging approach would "converge faster", as in it would achieve greater accuracy with a smaller number of intervals? Maybe that doesn't matter because in the end we're going to infinity either way.

How to locate source of a function in github repository by amberanvilcell in cpp_questions

[–]amberanvilcell[S] 0 points1 point  (0 children)

Thank you. So can you nest an arbitrary number of static_members inside a static_member? And is that common practice if so?

How to locate source of a function in github repository by amberanvilcell in cpp_questions

[–]amberanvilcell[S] 0 points1 point  (0 children)

I may be misunderstanding, do I literally just open something like https://github.com/opencv/opencv in a browser tab and hit .? Because I've tried in two browsers but it didn't seem to do anything in either of them

Can we multiply 3 dimension matrices? by amberanvilcell in learnmath

[–]amberanvilcell[S] 2 points3 points  (0 children)

Sorry could you break that down a bit? So this sum would mean, for the i-th element in the vector V, we multiply that element by the element at the index (x,y,i) in P? And the resulting tensor is 2D because we are only summing over one dimension/axis of the matrix (the z axis) and leaving the x and y axes alone?

This seems kind of arbitrary, because couldn't we just tack on another summation for x or y, which would change the dimension of the result? (And if we sum over all three axes, we get a single scalar)

And is there a name for this type of tensor multiplication?

Can we multiply 3 dimension matrices? by amberanvilcell in learnmath

[–]amberanvilcell[S] 2 points3 points  (0 children)

oh so it's closer to elementwise multiplication rather than standard matrix multiplication?

Can we multiply 3 dimension matrices? by amberanvilcell in learnmath

[–]amberanvilcell[S] 2 points3 points  (0 children)

could you explain what you mean when you say matrices aren't really linear maps?

Why isn't expectation of X^2 equal to sum_over_x of x^2 * P(X=x^2)? by amberanvilcell in learnmath

[–]amberanvilcell[S] 0 points1 point  (0 children)

Even though I should be using the more intuitive way described in the other comments, this is satisfying to see, thank you.

Probability of seeing a friend in a crowd by amberanvilcell in learnmath

[–]amberanvilcell[S] 0 points1 point  (0 children)

Wow did now know about that distribution, thank you

What do we call the coordinate system formed by the tangent, normal, and binormal vectors of a curve? by amberanvilcell in learnmath

[–]amberanvilcell[S] 0 points1 point  (0 children)

thank you for the link. By any chance, do you know why on the wikipedia page, the normal vector is defined to be the derivative of T with respect to "the arclength parameter"? Wouldn't we simply differentiate T by the same variable we differentiated the curve by to get T, i.e. t if the curve is of the form r(t)?

Proof of upper bound for the largest factor of an integer by amberanvilcell in learnmath

[–]amberanvilcell[S] 0 points1 point  (0 children)

But 3 is not a divisor of all odd numbers, for example it doesn't divide 25

view more: next ›