Linked Questions

4
votes
2answers
112 views

Defining a function of arguments with sub- and superscripts

I want to define a function that takes, several, let's say two arguments, both of which have several sub- and suberscripts. For example a function might have the signature $$ f(x_i,q_{j,k}) = \mathrm{...
1
vote
3answers
99 views

Solving a differential equation in mechanics

I have tried to solve a second order differential equation, but unfortunately the answer is too long and different from the desired one. Can you help me? Here is the code: ...
1
vote
1answer
41 views

Tooltip how to rename more than one equation

Manual shows renaming of one equation in Tooltip. If you have multiple equations in a single plot, how can I rename each equation?? Having Tooltip display lengthy equations if of little value, ...
2
votes
1answer
42 views

Exporting data from an Interpolating Function

Apologies if this question is repetitive, but I have browsed the questions already posed on exporting data from NDSolve and haven't been able to successfully apply the information I found to my own ...
1
vote
1answer
82 views

Solve won't solve

I try to solve a system of equations, there are 4 eqs and 4 variables I need to get. There are some other symbolic constants as well. When I try to solve, it shows empty backets: Out[n]={}. Is it ...
1
vote
0answers
36 views

Taking Fourier transform with WolframAlpha gives unexpected result [duplicate]

I have noticed that WolframAlpha's definition of the Fourier Transform is different than the one in my book of formulas. In my book the Fourier transform of $f(t)$ is defined as: $$\int_{-\infty}^{\...
3
votes
1answer
59 views

FindRoot and NDSolve question with multiple parameters

I'm trying to reproduce the results from 1, which solve the equations of an elastic ring (a closed loop elastica) under various loadings. Here is the relevant part: I need to solve the governing ...
5
votes
1answer
178 views

Why do the Integrate and NIntegrate give different results?

Bug introduced in 12.0 or earlier and persisting through 12.0.0 or later I'm using Mathematica to calculate the following integral, but I don't know why the result of using ...
0
votes
0answers
32 views

After execution of simple list manipulation every expression turns dark blue and nothing is defined - how to debug

This question is related to this one in the sense that it uses the code from there. What happens is best illustrated in the video here. When I run (* part 1 *) ...
0
votes
0answers
30 views

TagSet::sym Error using Subscript [duplicate]

I am a beginner to Mathematica and I am trying to get it to solve some equations of a function (vector) $B$ of three components, but first I want it to know that the derivates with respect to one ...
0
votes
1answer
56 views

How do I define a function that accepts a subscripted variable?

How do I define a function with subscripted variable? I want to write the following expression $\qquad f[a_9] =1+ a_7 + a_9$ I wrote ...
1
vote
0answers
37 views

Two point Gaussian quadrature [closed]

I am trying to calculate a two point Gaussian Quadrature on the interval [0,4] and the function f_n = (x^n) + 2 x - 3 for ...
1
vote
1answer
67 views

Minimization problem!

Im probably not seeing the obvious question but i want to minimize an expression like: Func[A_,B_,θ_,θ1_]:= A Cos[θ-θ1] + B Sin[θ]^2 where i do to minimize in ...
0
votes
0answers
61 views

solve a differential equation numerically

I have to solve numerically an equation of the form ...
-2
votes
2answers
68 views

NIntegral failing to converge

I have the following integrals that I am trying to calculate: ...

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