All Questions
Tagged with mathematica wolfram-alpha
35
questions
1
vote
1
answer
314
views
Difference in differentiation between Mathematica and Wolfram Alpha
I am trying to differentiate this:
$$f(x)=e^{-x^2}$$
In Wolfram Alpha I get this:
$$-2x\,e^{-x^2}$$
But in Mathematica I get:
$$-2x\,e^{-x^2}\log(e)$$
Why the difference?
- 341
0
votes
1
answer
58
views
Feeding parameters into a multivar function in Mathematica
I am trying to find an intersection point between a plane and a line. I defined my line as a function of $x,y$ and $z$.
g[x_, y_, z_] := 5 x - 8 y + 2 z - 13
I ...
- 15
2
votes
0
answers
206
views
Wolfram Mathematica: why is the plot not visible?
simple question regarding Wolfram Mathematica:
Why is the plot not showing?
(See screenshot)
(I am new to Wolfram Mathematica)
Thankful for any input.
- 67
0
votes
1
answer
88
views
Difference between wolframalpha.com and tio.run/#mathematica
While solving the equation rx+(1-r)(1-x)=1/2 on wolframalpha.com returns x=1/2 as a solution, it returns error messages on tio.run/#mathematica:
...
- 111
0
votes
0
answers
63
views
Help with Runge-Kutta Order 4th with a system of 3 equations
I have been trying to solve a system of equations with Runge-Kutta Order 4th but every time I try to run the program it says running but it doesn't load anything so I can't check if it is good or not. ...
0
votes
0
answers
19
views
How do I plot a gigantic function easily on WA?
I need to graph a gigantic function on WA, that has other functions inside it and some constants with preassigned values that come up a lot! For example:
W = QbBesselK...., in which Q is an equation ...
1
vote
2
answers
1k
views
Graphing parametric equation software? Desmos/Mathematica/ other math software?
I want to view what the graph of, for example,
$x=\sin t,\quad y = \sin(10t)$
looks like, but not as a static graph $\ y=f(x),\ $ but rather one where we can see the movement of the point on the $\ x-...
- 20.7k
1
vote
1
answer
71
views
Continuation of Hypergeometric Function when $a - b$ is natural number
I am currently implementing the 2F1 Gaussian hypergeometric function numerically, and need to know its continuation for $ |z| > 1 $.
I have researched this and found this nice formula in the ...
- 43
6
votes
1
answer
219
views
Why do Mathematica and Wolfram|Alpha say $\Gamma(-\infty)=0$?
According to Mathematica and Wolfram|Alpha, $\lim_{x\to -\infty}\Gamma(x)$ is equal to zero. See e.g https://www.wolframalpha.com/input/?i=gamma+function (at the bottom of the page), or try ...
- 71
2
votes
1
answer
117
views
How did the author solve this integral?
I have the following spherical density distribution:
$\rho(x, z) = \frac{1}{\sqrt{x^2 + z^2}\left(1+\sqrt{x^2+z^2}\right)^2}$
which I have broken into a "line of sight" dimension $z$ and a &...
- 339
0
votes
1
answer
295
views
How can I evaluate this complex integral equation on Wolfram?
I need to evaluate the complex line integrals in the following equation:
$$g(z)=\frac{\int_0^z\zeta^{-5/6}(\zeta-1)^{-1/2}d\zeta}{\int_0^1\zeta^{-5/6}(\zeta-1)^{-1/2}d\zeta}.$$
Can someone advise me ...
- 477
0
votes
0
answers
55
views
How to label different plots on one graph
I need to sign each plot separately, but I don’t know how to do it. PlotLabel signs all of them above the y axis
0
votes
3
answers
131
views
Why does Mathematica / Wolfram Alpha gives 2 different answers for these 2 queries?
I was assigned to find the integral of this expression:
$$ \int\frac{-5x^3+3x^\frac{3}{2}-2x^2-5x + \frac{3}{\sqrt x}}{x^2+1}\mathrm{d}x$$
I did:
$$ = \int\frac{-5x(x^2 + 1)}{x^2+1} \mathrm{d}x + \...
- 269
1
vote
1
answer
302
views
Explanation of the precision and the accuracy used by Wolfram Mathematica when performing arithmetic operations on floating point numbers
The numerical value for the precision in mathematica is given out by $MachinePrecision, and this is also the number of relevant digits showed in the output console ...
- 41
1
vote
1
answer
2k
views
Can WolframAlpha calculate a multivariable integral over arbitrary domain of integration?
If I had an integral specified like this: $$\int_{0}^{1}dx \int_{2}^{3} dy \int_{y^2+5}^{y-4} xyz \ dz$$
I would use this command in WolframAlpha to calculate it:
integrate (xyz) dz dy dx, x=0 to ...
- 389