Linked Questions
13 questions linked to/from Complex result for real vectors in VectorAngle
1
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VectorAngle returns complex angles [duplicate]
The built-in VectorAngle function sometimes returns complex output when the actual angle is very close to π. The imaginary ...
- 62.3k
28
votes
12
answers
8k
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how to get $n$ equidistributed points on the unit sphere
We can get $n$ equidistributed points in the unit circle using CirclePoints. But how do you get $n$ equidistributed points on the unit sphere(surface of a ball)? ...
- 27.2k
51
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4
answers
3k
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Funny behaviour when plotting a polynomial of high degree and large coefficients
I am trying to plot a polynomial of degree $29$ on the domain $[0,1]$, with fairly large coefficients:
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- 1,503
27
votes
6
answers
5k
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Annoying display truncation of numerical results
I have a lot of data to inspect. An example of a number in my program is
123.189094
This gets displayed as
123.189
...
- 8,763
31
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5
answers
3k
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How to speed up estimation of mean and Gaussian curvatures on triangular meshes?
I am trying to estimate curvatures on a triangulated surface/manifold using the algorithm of : Meyer, M., Desbrun, M., Schröder, P., & Barr, A. H. (2003). Discrete differential-geometry operators ...
- 4,313
36
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3
answers
2k
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Fast spherical polygon
Cross posted on Wolfram Community
Question
Given a list of points on a sphere and the sphere's radius, I'd like to plot a spherical polygon with those points as vertices.
And this needs to be fast, ...
- 138k
15
votes
1
answer
1k
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Converting to machine precision
There are multiple ways to convert an expression to machine precision, for example:
...
- 85.4k
8
votes
2
answers
386
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10
votes
1
answer
735
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Confused by (apparent) inconsistent precision
$$ e^{\pi \sqrt{163}} \approx 262537412640768743.99999999999925 $$
E^(Pi Sqrt[163.0])
N[E^(Pi Sqrt[163.0]), 35]
NumberForm[E^(Pi Sqrt[163.]), 35]
returns
<...
- 6,998
3
votes
4
answers
232
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Calculating the angle between vectors returns small complex number instead of zero
I am calculating the angle between vectors
$$cos(\theta{_a}{_b}) = \frac{a^T b}{||a|| ||b||}$$
In mathematica I am coding
...
- 133
3
votes
1
answer
906
views
Angle between two vectors in spherical coordinates [closed]
I have two vectors:
H = {1, 0, π/4};
EA = {1, 0, 0};
Which I want to be in {r, Phi, Theta} - which would should give an angle between the two vectors as ...
- 217
3
votes
2
answers
168
views
Negative Correlation Distance
Bug introduced in 8.0 or earlier and fixed in 11.2.0
CorrelationDistance[{-53.0, 4.3}, {-23.0, 5.4}] is a negative number. It is close to zero, to be sure, but ...
- 303
0
votes
0
answers
45
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Please explain this unexpected code snippet behavior [duplicate]
Consider a function that maps a complex function z->f(z) to it's multivariable counterpart (x,y)->f(x,y)
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- 9,687