129 reputation
6
bio website danijar.org
location Berlin, Germany
age
visits member for 1 year, 1 month
seen Apr 17 at 6:51

Hey, I'm Danijar Hafner,

a German undergraduate with strong interest in developing complex computer systems and robotics. My further technical interests are Machine Learning, Computer Vision and Cognitive Science. Currently, I am coding an open source video game but I like creating new things in general.

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Apr
15
accepted Is it possible to generate a circle with a Bezier curve?
Apr
15
asked Is it possible to generate a circle with a Bezier curve?
Jan
4
awarded  Commentator
Jan
4
comment Proof that $\frac{(x+y)-abs(x-y)}{2}$ equivalent to $\min(x,y)$
Thank you. By the way, I think we could define $abs(x)$ as $sqrt(x^2)$.
Jan
4
accepted Proof that $\frac{(x+y)-abs(x-y)}{2}$ equivalent to $\min(x,y)$
Jan
4
comment Proof that $\frac{(x+y)-abs(x-y)}{2}$ equivalent to $\min(x,y)$
Thanks, so the one is just branch less notation for the other. Just for curiosity, can one write any function that uses cases without using them?
Jan
4
asked Proof that $\frac{(x+y)-abs(x-y)}{2}$ equivalent to $\min(x,y)$
Aug
9
awarded  Quorum
Apr
16
comment Commutative applying rotations around three axis
Roll doesn't affect the sphere. It rolls the object inside the sphere around the sphere's radius. So in you example the roll value wouldn't change at all. Does that make sense to you? It's similar to the fourth component of a quaternion that represents a rotation.
Apr
15
accepted Commutative applying rotations around three axis
Apr
15
comment Commutative applying rotations around three axis
Why would I have to distinguish latitudes for the poles? They are just a point, so I won't matter. Latitude is at least a direction then. I solved my problem using spherical coordinates along with a value for roll. Since your answer lead me to this, I'll mark it as accepted.
Apr
13
comment Commutative applying rotations around three axis
By using quaternions the angles haven't to be applied separately. So that is an alternative representation of rotations. However, it's not practical for me since you can't easily consecutively rotate an object by just consecutively increasing a value. Instead, you have to take care of circular movement of the nose. As writing that, it comes to my mind that I might want to use latitude and longitude for the noes. Is there a term for rotations represented by latitude and longitude direction and roll?
Apr
13
comment Commutative applying rotations around three axis
That's why I am looking for another representation for rotation, besides yaw, pitch and roll. It should use three values, too, and somehow must be orientation independent.
Apr
13
asked Commutative applying rotations around three axis
Mar
28
awarded  Scholar
Mar
28
accepted How to get angle bewteen two vectors in range -1 to 1 without using arc cosine?
Mar
28
comment How to get angle bewteen two vectors in range -1 to 1 without using arc cosine?
@VincentNivoliers. If you would write an answer, I will mark it as accepted since the dot product is just what I was looking for.
Mar
28
comment How to get angle bewteen two vectors in range -1 to 1 without using arc cosine?
I would prefer to not use sine, cosine and their inverses. It sounds silly but what I was looking for is just the dot product. I didn't knew that its in the range [-1, 1] for normalized vectors.
Mar
28
comment How to get angle bewteen two vectors in range -1 to 1 without using arc cosine?
It is guaranteed to be in the range from -1 to 1?
Mar
28
asked How to get angle bewteen two vectors in range -1 to 1 without using arc cosine?