# All Questions

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### solve for x in the following equation. Assume that a,b,c,d,f,g are constants. (ax+b)(cx+d)=(cx+f)(ax+g)

solve for x in the following equation. Assume that a,b,c,d,f,g are constants. (ax+b)(cx+d)=(cx+f)(ax+g)
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### seach combinaisons of terms that equals a sum within a sequencial ordered linear values? [on hold]

subset size k = 2 (can be > 2) Sum to find = 11 sequence : 1,2,3,4,5,6,7,8,9,10.. n => result of k-size [1,11] [2,9] [3,7] ....
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### BarLegend problem when rescaling color of multiple vectorplot

I want to rescale colors of multiple vector plot. Similar posts are (1), (2) I made a minimal example to show the problem I encountered ...
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### Missing curves in a plot

I am trying to plot multiple curves for a particular parameter in a function S1, where the only variable is t and the rest are ...
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### Conjugate[A/B+C/D]

Trying to obtain the result of Conjugate[A/B+C/D] only gives the same result. As such, I use Refine as: ...
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### The function I defined is not giving any output [on hold]

Could anyone tell me why the function I have defined is not giving any output? When I run it, gen is not showing any output. Thanks! ...
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### Plot independent 2D graphs on walls of 3D Plot

Sorry, I know a lot of similar questions have been asked before, but I just can't find one that exactly describes my problem. How can I make the according 2D (marginal distribution) graphs appear on ...
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I want to find a numeric solution using Grad. With Solve, I get ...
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### Compute second functional derivative with VariationalD?

I have problems to compute the second functional derivative of a general function. The following lines generate the first derivative: ...
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### Can MMA solve this min-max optimization problem symbolically?

I have a nonlinear optimization problem with linear constraints. How to solve this? $\sigma_i$ and $\rho_i$ are the optimization variables. $\min\hspace{1mm}\max{D_1,D_2}$ subject to ...
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### Wrong limit: Limit[(1 + (-1)^n/n)^n, n -> Infinity]=1 (Mathematica 10.4 and W-Alpha)

Since $(1-\frac{1}{n})^n\to 1/e$ and $(1+1/n)^n\to e$, the sequence $(1+\frac{(-1)^n}{n})^n$ has no limit as $n\to\infty$, but has limits for odds and even numbers. If $n$ were taken to be real, there ...
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### 3DPlot Rendering Artefacts (z-fighting)

I am trying to render a matrix as a depth map: ...
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### Wave equation PDE with changing boundary condition

This is my first post here, normally with mathematica I will solve out the PDE using eigen function expansion or separation of variables and then model the solution in mathematica. However this time I ...
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### Mapping over function's several parameters regions

About this post: Mapping multiple parameters of a function to specific values I wonder if the parameters a and b have ranges ...
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### Wrong numerical results from LegendreP

{Cos[Pi/180] // N, LegendreP[46, 0.9998476951563913], LegendreP[46, Cos[Pi/180]] // N} give ...
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### Vastly incorrect answers obtained by increasing WorkingPrecision with modified Bessel functions

This is a follow-up to this question regarding numerical instabilities occurring with modified Bessel functions. In trying to explore J.M.'s answer to that question in greater depth by setting ...
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### REAL Roots of a 2 variable Polynomial

I am looking to plot the real zeros of polynomials of two variables in Mathematica, but I have encountered an issue. To accomplish this task I have been using ContourPlot to plot the polynonial ...
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### Optimization of the solution to an ODE

Apologies if this is obvious -- I'm very new to Mathematica. I'm trying to minimize the solution to an ODE with respect to a variable. The following code generates the solution to the ODE, ...
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### Eigenvalues of a symbolic matrix using interpolating function

I have a 6x6 matrix with entries that depend on dependent and independent variables of an interpolating function. I would like to be able to evaluate the eigenvalues of this matrix using the ...
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### Modeling Gaussian Distribution for 4 Variables

I have 4 random variables A,B,C,D, that all have the same variance $\sigma^2$, but they are independent of each other. What I am trying to find, or to at least approximate, is the standard deviation ...
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### How to plot a lattice (2D or 3D) given a basis

I want a graphical picture of a lattice with basis such as $\{(1,1), (\sqrt{2}, -\sqrt{2})\}$. Does Mathematica already have a pre-made function that finds all linear combinations over $\mathbb{Z}$ ...
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### DensityPlot with logarithmic xy-axes and logarithmic color scale

I would like to do a DensityPlot with logarithmic xy-axes and logarithmic color scale for the function \begin{align} S(\epsilon_{v},\epsilon_{\phi}) = \frac{\pi}{\epsilon_{v}} \frac{\sinh ...
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MWE ...
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### Minimize: which algorithm is in use?

How can I know which algorithm has been used by Minimize to solve a given problem? Can I force Minimize to use a specific ...
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### How to label individual points in data set with use of SciDraw?

I'm trying to lable each point in data set and adjust corresponding TickLabels. Here is my code: ...
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### Code conforming to math in Java/Sage code

I've already posted a question here asking for help writing code. Here's the key points: I'm looking for a way to use calculate OEIS A144311 efficiently in Mathematica. This series considers ...
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### Equation cannot be solved with the methods available to Solve [duplicate]

I am a beginner to Mathematica. I am trying to get the solution of such equation as: Solve[-b*M + L*R - a*M*Log10[L*c + (L*d*(1 - M)*S)/R] == 0, R] Constants are ...
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### finding list by expresion

Well Im new to mathematica. I have list of x which contain {1,23,45,6,43}. And I get expression from g = Fit[t, {1, v, v^2}, v] how can apply list x to g to ...
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### How to correctly implement in a new function the scoping behavior of Table, Sum and other commands that use Block to localize iterators?

It is documented that "Block is automatically used to localize values of iterators in iteration constructs such as Do, Sum, and Table." Therefore the dummy index (iterator) in a Sum is shielded ...
I'm trying to find an expression that, given $x$, $y$, and $R$, gives the indefinite 2D integral of a function at the circle centered on $(x_0, y_0)$ with radius $R$. With $g$ as defined below, I'd ...