# All Questions

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### Is the MaximalBy function still used

On the mathematica reference website it gives examples using the MaximalBy function, However when I am using it, I see no desired output. This leads me to wonder if mathematica has stopped using this ...
22 views

### Plot a one-dimensional list of numbers as a column/row of labeled colored squares?

I have a list of numbers, and a matching list of labels. I want to plot a column of colored squares, with the color of each square matching (in some color scale) the value of the corresponding number. ...
75 views

### Plotting Time Series with call to Wolfram Alpha

I am trying to plot stocks showing some of the local maxima. As an exercise I first tried to load Apple's stock data from Wolfram Alpha with the following code: ...
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### What is the order of execution of Animate?

I used to think the execution order of Animate is the same as For until I find: ...
98 views

In the Version 10 interface, at least by default, there is no longer a common menu bar in a separate window, and menus appear to be localized to individual Notebook windows. If I select a Palette and ...
266 views

### Find patterns in a list

again, I have a list like this: ...
29 views

### Efficient processing of Special Ordered Sets with LinearProgramming

I'm playing with integer linear programming, especially problems involving lots of constraints which would appear to be special ordered sets. Below is a toy example, three last rows of the matrix ...
145 views

### Permutations with restrictions

I have a problem that can be modeled as: there are 8 boxes in total, and 60 different items. I want to put all items into boxes (all of them can be put into a single box). Now I want to find: 1) ...
288 views

### What is my problem with MeshFunction?

I want plot the max value in a sine plot. We can use the following code ...
49 views

### Recursive function with array of variables

I am trying to create a recursive function which works with an increasing array of variables. Since the formula is quite complex, i will try to simplify my example to the core of my problem. The ...
217 views

### Tuples without self-loop

I have a simple question coincerning the Mathematica function Tuple. Currently, I apply the following code ...
75 views

### Enabling/disabling individual locators within a Manipulate

This post helped me out somewhat but it is missing a piece that I really need for something that I am working on that's more complex than what I've shown below. I want to disable a ...
122 views

### Selectively updating individual graphics in a dynamic, multiple-plot Show

Suppose Show contains multiple graphics objects that differ markedly in the amount of computation needed for their display. Hence, when dynamically updating only ...
78 views

### How to limit number of user-defined messages issued per evaluation

I have written code such that if it runs into a particular function, a warning message is issued. However, it is common for the program to call this function several times in a single evaluation, but ...
362 views

### How to create these famous surfaces in topology with the desired color effects?

It was said such real objects of famous topological surfaces were plotted by the cooperation between mathematician Richard Palais and artist Luc Benard, and published as the cover page of Science ...
51 views

### NDSolveValue producing message: Input is not an ordinary differential equation

I have an urgent question for my program because I get always an error output for it. I have a partial differential equation that I want to solve with NDSolveValue. ...
1k views

### Tricks for solving (lots of) coupled nonlinear equations numerically?

I have a system of 6 non-linear (quadratic) coupled equations with 6 complex unknowns \begin{align*} |x_1|^2 + |x_2|^2 + |x_3|^2 &= a\\ x_1 x_4^* + x_3 x_5^* &= b + c i\\ x_1 ...
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### What is the meaning of a result of {{}}? [on hold]

What does an output of {{}} mean in Mathematica after solving a system such as: $e^{x}=e^{x}$ for $x$?
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### How to solve three equations with four unknowns iteratively?

I have three equations of the form $\quad \eta = f(N1L, N2L)$ $\quad N1L = g(\eta, R)$ $\quad N2L = h(\eta, R)$ I want to eliminate $\eta$, so that I can get $N1L$ and $N2L$ for a range of $R$. I ...
42 views

### Extract the minimum positive root from a quintic [on hold]

I need to compute the values of ϵϵ and x2 from the following sytem: ...