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Expression as parameter to function that evaluates it, best way to do it?

I need a function fSum that computes the angular sum for some expression, like this: fSum[3 Sin[2 x], 0, 2 π] Or from a predefined function, like this: f[x] = 2 Sin[3 x]; fSum[f, 0, 2 π] Or plots it ...
Mikl's user avatar
  • 101
0 votes
2 answers
61 views

Problem with $ sign in temporary function parameter

I am having a problem with $ sign in the name of a parameter to a temporary function. The functions I have should compute the angular sum (or turning angle) for some expression generated by function <...
Mikl's user avatar
  • 101
7 votes
3 answers
409 views

How to plot a surface given implicitly by 3 equations in 5 coordinate variables?

I have 3 implicit equations in 5 variables: $f_1(S, y_h, y_d, x_h, J)=0$, $f_2(S, y_h, y_d, x_h, J)=0$, and $f_3(S, y_h, y_d, x_h, J)=0$. These equations determine a 3D surface in $S-y_h-y_d$ ...
yuhao chen's user avatar
1 vote
1 answer
63 views

Problems with Solve. Only works for specific parameters. Solve function do not "start"

I have the following problem I want to solve the following equalities. My used code: ...
Tremonia's user avatar
0 votes
0 answers
88 views

Find the condition under which an inequality is satisfied

I need to find the conditions among the variables under which the inequality est-tru>0 holds. ...
Dotman's user avatar
  • 456
3 votes
0 answers
80 views

How can I calculate P-Value for a custom distribution?

I used DistributionFitTest but it works only with a defined distribution. This is the distribution that I used: ...
A Day's user avatar
  • 59
2 votes
1 answer
134 views

SIR Parameter Estimation in Mathematica

All infected individuals go through an incubation period, which lasts on average for 4 days. During this time, individuals are not infectious, nor do they have any excess mortality risk. All infected ...
Athanasios Paraskevopoulos's user avatar
0 votes
1 answer
128 views

Find parameters in an SIR model

...
Athanasios Paraskevopoulos's user avatar
2 votes
2 answers
144 views

Optimize parameters for differential equations

I have differential equations f11, f12, f21, and f22 with respect to t with parameters A and B. I've defined and solved these equations using NDSolve in Mathematica as follows: ...
Saesun Kim's user avatar
  • 1,810
2 votes
1 answer
147 views

How to define function that returns another function?

I'm new to Mathematica and I have an issue: I'm trying to define a function that accepts as parameter another function with parameter X and then returns a function also with parameter X. Input: ...
aku jack's user avatar
1 vote
3 answers
150 views

How to check whether a function parameter is another function?

How can I check if a function parameter is another function defined with := f[n_] := n^2+1 g[fun_, n_] := fun[n] g[f, 3]
Giovanni Russo's user avatar
7 votes
1 answer
153 views

Solve computes discontinuous eigenvalues of parameter-dependent matrix

So I have a family of unitary matrices $m(x,y)$, which depend on two parameters $x,y \in [0, 2 \pi)$. Its eigenvalues should be continuous in $(x,y)$. Since $m(x,y)$ is a unitary matrix, its ...
Andreas132's user avatar
1 vote
0 answers
35 views

PlotLegends parameter with subscript and multiple of other parameter in Mathematica

PlotLegends -> LineLegend[{Style[Subscript[ω, i] t == 0, Black]] When I use this command in Mathematica 13.2, I get ...
Sajjad Hussain's user avatar
2 votes
1 answer
85 views

Is there a function which checks the validity of a string to be used as argument to RegularExpression?

Is there a function which checks the validity of a string to be used as argument to RegularExpression? Composing regular expressions is not an easy task. In ...
Adalbert Hanßen's user avatar
2 votes
0 answers
43 views

How to attribute the right encoding for PointValuePlot

in the following program ...
Franck's user avatar
  • 391
1 vote
3 answers
71 views

How can I write a function definition which gets another function as parameter whether the parameters of the function match a pattern?

One can write functions which depend on the type of actual parameter before they are actually called. E.g.: ...
Adalbert Hanßen's user avatar
1 vote
0 answers
37 views

I've got a system of ODEs which depends on a parameter $\alpha$, but the solution won't be plotted [closed]

...
Student's user avatar
  • 177
4 votes
2 answers
217 views

Plotting an inequality over the range of a parameter

I have a simple inequality, $$x+\cos(\theta)\, y > 0$$ and I'd like to plot the region in $x,y$ space which satisfies this inequality for all values of the angle $\theta$. I'm trying to do this ...
su.jai's user avatar
  • 43
0 votes
0 answers
33 views

Defining parameter as function without losing properties of the derivative

I have built a code that is later on solved dynamically depending on values I set using Manipulate while plotting. However, I came across a problem I cannot resolve. So, I defined ...
mathematica_rookie32's user avatar
1 vote
0 answers
57 views

Calculating eigenvalues and solving inequalities with parameters

I would like to calculate b in terms of c and a, in order to satisfy the following conditions: ...
Wiki's user avatar
  • 11
0 votes
1 answer
44 views

ParametricPlot 2D with 2 parameters

...
Kerry 's user avatar
  • 45
0 votes
1 answer
73 views

ParametricNDSolve with 2 parameters displays unexpected behavior, crosschecked with 1-parametric version of the same system

I apologize in advance for posting some lengthy code, I tried to tackle this with a simplified question yesterday here but once I implemented the suggested answer by @march deeper issues arose. I am ...
Luke Harper's user avatar
1 vote
1 answer
63 views

Using NSolve after ParametricNDSolve to find the value of one parameter over a range of values of the other parameter and at a specific time

I am new to Mathematica, so excuse me if this is trivial. I could not find anything similar by browsing questions or the wiki. I am working with a long set of ODEs but currently my problem can be ...
Luke Harper's user avatar
1 vote
1 answer
78 views

NestWhile question, ensuring a function is repeatedly applied to a newly set input-value

Problem: I need to ensure that a function which is repeatedly called in NestWhile correctly uses a newly computed input on its next call. I will give the context while omitting parts of the code (...
ExpressionCoder's user avatar
0 votes
1 answer
169 views

How can I calculate the parameter function of this curved like 3d mesh?

...
HyperGroups's user avatar
  • 8,619
0 votes
1 answer
46 views

find maximum don't work with me i don' know why? [closed]

i have log function like this and i want to find maximum for it the log function like this ...
Ahmed's user avatar
  • 369
1 vote
1 answer
104 views

Plot of a recursive expression having a parameter

I have a recursive expression defined as $$ h_u= (1-a)(1-b) h_{u-1} + \sum_{k=2}^{u-1} (1-a) b h_{u-1-k} - \sum_{k=2}^{u} h_{u-k} - \sum_{k=1}^{u+1} \Lambda_{u,k} $$ where $\Lambda_{u,k} = \sum_{m=u-k+...
Rosy's user avatar
  • 53
2 votes
1 answer
105 views

Evaluate a double sum using Mathematica

I am evaluating using Mathematica, the double sum $\sum_{u=0}^\infty \lbrace \sum_{k= u+1}^{u+y}[\dfrac{(1-a)}{4} (3/4)^k + 3a[(\dfrac{1}{2})^{k-1} - (\dfrac{3}{4})^{k-1} ]\rbrace $, where $'a' $ is a ...
Rosy's user avatar
  • 53
0 votes
1 answer
90 views

I have a problem in log likelihood which I wrote for custom distribution

I have a custom distribution and data as follows ...
Ahmed's user avatar
  • 369
0 votes
0 answers
23 views

Estimate parameters from random samples drawn from a copula distribution [duplicate]

I defined a copula distribution as follows: ...
Ahmed's user avatar
  • 369
0 votes
1 answer
73 views

what is wrong in my code for calculate parameters bivariate distribution?

data is i,j as x, y as in pic ...
Ahmed's user avatar
  • 369
0 votes
1 answer
112 views

How to find maximum likelihood parameter estimates for a custom bivariate distribution?

this is univariate distribution ...
Ahmed's user avatar
  • 369
2 votes
2 answers
113 views

What's wrong in my custom distribution?

i want to write this function ...
Ahmed's user avatar
  • 369
1 vote
2 answers
100 views

How to assign table parameters to use it many times

I'm using two nested Table to generate data which depend on two parameters, let's say it is temperature and pressure, many times in my code. When I change the temp ...
Lechuu's user avatar
  • 534
0 votes
2 answers
109 views

How to take the derivative with respect to a function with more than one variable?

I have a function that includes another function inside. I want to know the derivative at every point x. I have spent a lot of time trying to figure out how to do this, but I am very lost. I have ...
Victor Nielsen's user avatar
4 votes
1 answer
582 views

My model has not finished evaluating in more than a day so can't test if it works, what is wrong with it?

Hello I have this modified monocentric city model that I have been working on for a while. Sorry for the long post, I wanted to add the whole code, because it's all connected. My suspicion is that it ...
Victor Nielsen's user avatar
1 vote
1 answer
200 views

Finding fit parameters for a 2-dimensional matrix of data if the value of some parameters depend on the row and others on the column

I have some 2-dimensional data of dimension n x m that I suspect has the following structure: ...
edmateosg's user avatar
  • 121
1 vote
1 answer
218 views

Find the parameter in NDSolve giving the desired solution

EDIT: I've edited many times because the system gives errors when the body is modified all at once. I've simplified the problem. The simplification consists of having reduced the number of parameters ...
Gianluigi Tartaglione's user avatar
0 votes
1 answer
68 views

NonlinearFit with series coefficients

I have a set of data: ...
Malum Wolfram's user avatar
-1 votes
2 answers
119 views

Plotting the parameter space corresponding to a solvable equation

I am considering a function $f(T, c_1, c_2)$ for which I would like to plot the region in the $c_1$ and $c_2$ parameter space that corresponds to the values of $c_1$ and $c_2$ such that $f(T)=0$ has a ...
phenolphthalein's user avatar
1 vote
2 answers
115 views

How to organise definitions that contain named parameters?

I have lots of definitions of (usually numeric) quantities that depend on parameters; they're mostly matrices (in the actual code, there are many more definitions): ...
Deniz's user avatar
  • 235
0 votes
1 answer
270 views

How do I calculate Mean Squared Error of parameters alpha and beta? [closed]

...
Ahmed's user avatar
  • 369
3 votes
2 answers
373 views

Problem with solving a linear ODE with a parameter

I have been struggling with the following ode for several weeks, but I fail to solve it. So I post this question and my attempts and expect someone here could give some suggestions. First, define an ...
Enter's user avatar
  • 1,229
-1 votes
1 answer
73 views

Integrate and InverseFunction

I solve an easy example to check that Mathematica can understand the difference between ArcTan and ArcTanh but as you see here I can't get Arctanh??!! Even I don't know why the inverse function is not ...
Mathecis's user avatar
  • 153
1 vote
0 answers
118 views

How to fix a parameter in SolveAlways

In expression: SolveAlways[f1(a)+f2(b)x+f3(c)x^2+f4(d)x^3==f5(d)x^2+f6(e),x] Functions fi are known. How do I tell mathematica that d is a fixed constant?. I want ...
Gabo's user avatar
  • 11
1 vote
3 answers
311 views

How to specify the domain of a parameter?

There is a similar post: How to specify the domain of a variable?, but it doesn't work well for me. I want to evaluate the integral below, with a parameter $\gamma$. The result is obviously different ...
Apocalypse's user avatar
2 votes
1 answer
100 views

Table of surface Parametric draw

I'm trying to reproduce this kind of graph for a spherical cap, with different span ratios. I tried with this: ...
Matteo Lai's user avatar
0 votes
0 answers
152 views

Solve Differential Equation with Boundary Conditions (lengthy equation)

I have a lengthy equation to be substitute into a differential equation. I used DSolve to generate the output. However, it took me more than 3 hours and it still running. The DE is the convective-...
Aifa's user avatar
  • 81
1 vote
3 answers
121 views

Problem with ParameterFitting:""The function value...is not a list of real numbers..."

I'm trying to use the data: ...
Flash Black's user avatar
0 votes
1 answer
245 views

Restrict the domain of a function (and plot) it) when it depends on the value of a parameter [closed]

I know similar questions have been asked, but I am very new at Mathematica and other questions/answers are quite complex and do not suit the code I want to write. I want to restrict the domain of the ...
Banalaude's user avatar
  • 107