Newest Questions
96,893 questions
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Mathematica fails to give real integral
I am trying to integrate the following expression:
$$f(x) =\frac{2 x^2}{\sqrt{\left(\sigma -sx \right) \left(px^3 +s x-\sigma\right)}}$$
I have that $p>0$, $\sigma>0$ and $0<s<1$.
With ...
- 103
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Visualize the contour for $\oint_{|z|=2} \frac{1}{z^2+1}\,dz$ with two enclosed poles
I solved the following Integral
$$
\oint_{|z|=2} \frac{1}{z^2+1}\,dz
$$
and in my proof, I factor $z^2+1=(z-i)(z+i)$, so the function has simple poles at $z=i$ and $z=-i$, both inside the contour $ |z|...
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TransformColumns using DateObject's TimeZone option
I'm importing some date-based data from a CSV file into to a Tabular object. I've noticed strange behavior when transforming the dates to DateObject's using the <...
- 1,512
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Integration by the trapezoid method of an integral with coinciding limits
Please tell me what needs to be changed in my code so that manual numerical integration works the same way as the built-in integration function?
Code with built-in numerical integration:
https://www....
- 41
-1
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35
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Concurrency of lines through diagonals and tangents in cyclic quadrilaterals [closed]
Consider a circle with diameter
�
�
AB, and let
�
�
CD be a chord intersecting it. Let lines
�
�
AC and
�
�
BD intersect at point
�
G. Reflect
�
G over the center
�
O of the circle to obtain point
�
′
...
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Using NSolveValues for an array of entries [closed]
I have the following code that works for one input, but I'd like to evaluate it for all elements in a vector of entries. I have checked that it works for the individual entries of the vector but want ...
- 105
7
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90
views
A. L. Crego "Traces" video art reproduction
I saw this recent art "Traces" by A. L. Crego - check original at the link, ecause animated GIF here is low quality:
I cannot figure out what makes it look like it does. I guess we could ...
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35
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Unable to solve a system of nonlinear equation [closed]
while going to solve a system of nonlinear equation,its showing an error namely Solve::svars: Equations may not give solutions for all "solve" variables.
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Using a Solution of NSolve in Further Calculations [closed]
I want to take the solution from an NSolve and perform operations on the result, a bit like the following code. Please can someone advise on how I 'extract' the NSolve solution as a variable. Thanks
<...
- 105
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43
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How to disable auto-copy on selection in Mathematica (Linux)?
Is there any way to disable the automatic copying of selected/highlighted text in Mathematica on Linux?
While this feature is generally useful, I find it quite inconvenient in Mathematica—especially ...
- 695
4
votes
1
answer
219
views
Diving into orbitals created by DensityPlot3D
I was asked by a high school chemistry teacher to visualize electron orbitals of hydrogen atom for various quantum numbers. This is trivial and one can find a worked out example in the ...
- 349
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88
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NDSolve of a beautiful Integro-differential equation
I have a problem when I want to solve this integro-differential equation where the $\chi' (U)$ appears in the integrand. If statement gives the $chiIntegral=0$ for $umax=20$ since the upper bound of ...
- 109
3
votes
3
answers
163
views
What could I do when NSolve fails to give solution?
My code was:
f[x_]:=(Exp[x]-2)/x;
NSolve[{f[a]==f[b],f'[a]==f'[b],a>b},{a,b},Reals]
The output was an empty list {}. However,...
- 313
1
vote
1
answer
60
views
Advice for solving a system of complex equations
I'm interested in investigating the following function f[w].
...
- 111
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votes
0
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101
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How can I stitch or expand clusters of 2D points so that they share border lines?
I have 2D points clusters with $k$-means:
There are space gaps between them if you draw clusters cover area or region, since a point belong to one and only one cluster and between clusters' border ...
- 19