# All Questions

1answer
348 views

### How to obtain transparent animated gif via Export?

I have the following code to create animated GIFs: ...
2answers
66 views

### Why does Repeated not work in this case?

I think I don't understand how to use Repeated. I have a list for example list={a,b,a,b,a,b,a,a,b} I want to detect whether ...
2answers
123 views

### Interesting “Tuples” application

I want to start with: {a,b},{c,d},{e,f} and end up with: {a,c,e},{a,c,f},{a,d,e},{a,d,f},{b,c,e},{b,c,f},{b,d,e},{b,d,f} ...
0answers
100 views

### Fourier transform of Exp[x]/x

Could you please explain why Mathematica gives the following expression when taking Fourier transform of $\exp(\lambda z)/\lambda$? $$\frac{-\log(-z)+\log(z)}{\sqrt{2\pi}}$$ Why the answer does not ...
1answer
29 views

### FindRoot outputs a lot of nlum and ReplaceAll errors before outputting (close) root

I'm trying to find the root of the root function when some other variable is subtracted. I.e. FindRoot[root[theta, r, h]-H, theta] Whenever I do this, FindRoot ...
1answer
42 views

### check content of a Matrix

I have a matrix which contain rotated ellipses and points, how can I check if the element in the position {i,j} is either a point or an ellipse? the code is a bit longer but the structure is like: ...
1answer
42 views

### Evaluating Root forms in a Table

When I put a Root form in table, the parameters of the Root form don't evaluate. I don't know how I can indexed values substituted into root form in the table to get have numeric output. ...
1answer
65 views

### How to make a set of interdependent popup menus work?

Here is my code that is not working. ...
1answer
106 views

### Arithmetic Progression [on hold]

How can I resolve these issues? I'm from Brazil and I don't have many things related to the subject here ** In an arithmetic progression of 6 Terms, the reason is 5. The product of the 1° with the ...
0answers
36 views

### “Not enough memory” error even though plenty of memory still available

Summary: The evaluation of an Export[...] expression fails with a "Not enough memory available" error, but the value returned by ...
4answers
90 views

### Multiple output cells, suppressed by semicolon

I'd like to write a function that outputs multiple cells, as in Multiple output cells, but not when the function is called with a semicolon at the end. Any idea how?
2answers
561 views

### Row-Reduced-Echelon-Form with Equation Parameters for Consistent Systems

I often do row-reduced-echelon-form (RREF) calculations that involve parameters using the RowReduce command. Most times, I want to know which parameters make the system consistent. For example: ...
1answer
46 views

### Fastest way for data input into StreamPlot function

I'm interested in looking at graphing the phase portraits of 2x2 autonomous ODEs, and I'm using the StreamPlot function. Here is one simple example: ...
1answer
74 views

### How to convert Image3D object into Graphics3D object and vice versa?

There are some rendering options (for example, Lighting) which are associated with the Graphics3D objects. I cannot apply these ...
3answers
96 views

### Finding negative sequences in a large list: optimization

I ran across an interesting challenge recently, and I was thinking this community would know how to optimize it. I have several data sets which have (currently) about 50k-100k points. The sets ...
1answer
60 views

### Dialog notebook with multiple popup menus

I'm trying to create a user interface in Mathematica; the user will enter specified information, it will be processed, and then data will be inserted into a MySQL database. The pieces work ...
2answers
125 views

### Solving system of equations with (nested) Bessel Functions

I'm trying to find solutions to a system of equations which include Bessel functions. It feels like the problem for mathematica is that the arguments of the Bessel functions are functions themselves ...
1answer
96 views

### How to convert arbitrary raw boxes directly into String?

This question is motivated by the recent question about searching inside of the NB files. According to the Documentation, ToString expects a high-level WL ...
0answers
30 views

### Is there a syntax coloring type that highlights only when not in a list?

How do I define the syntax coloring of function myfunc so that it only colors the variable that is not in a list? For example, ...
1answer
65 views

### Nonlinear Markov chain (numerical simulation)

Suppose you have a linear Markov process, and you can write it as x(t+1) = Ax(t). Here x is the vector of values, and A is the transition matrix. Since this is linear, it can be solved analytically, ...
0answers
37 views

### Can “Part” be hold? [on hold]

I'm trying to define a function of which the length of the argument is undetermined. However, the exact form of this function depend on the length of the argument. And to save time, I have to evaluate ...
1answer
35 views

### How to call a function with an arbitrary list as its arguments inside a functional? [duplicate]

I have the following functional defined (i.e. a function of another function) where variableList contains the variable (arguments if you wish) of the ...
0answers
25 views

### What mathematica function to identify/approximate branching model\ [on hold]

I have a class of problems illustrated by the example below with emphasis on the fact that the sum of the variables is a constant. Is there a name for such problems? Which mathematica function would ...
0answers
88 views

### ListContourPlot cannot plot enormous datafile [on hold]

I would like to create a ListContourPlot from a list with about $7,000,000$ triplets (x,y,z) using the following code: ...
0answers
4 views

### Isothermal coordinates [migrated]

Is there an application or interest in studying the isothermal surfaces where the metric is $ds^2=E∗(du^2+dv^2)$ and where $E>0$ is an harmonic function? I know that this metric is a special kind ...
0answers
46 views

### Use If condition with ListPlot

Here is my code to use If condition with PLot: ...
0answers
38 views

### Moving label with manipulate [duplicate]

In the following Manipulate, I would like to plot a distinct comment in each distinct zone which will move with the manipulation. Is it possible ? ...
3answers
171 views

### OEIS A144311 Generating function

I'm looking for a way to use calculate OEIS A144311 efficiently in Mathematica. First, let's define the series. In one sense or another, this series considers the number between "relative" twin ...
2answers
43 views

### How to arbitrarily label the points in ListPointPlot3D within Manipulate?

I want to label the points displayed in 3D within a Manipulate expression with arbitrary text. My code is as follows: ...
1answer
66 views

### FunctionInterpolation produces many error messages when given high-precision input [duplicate]

Both FunctionInterpolation[1, {x, 0,1.00000000000000004}] and FunctionInterpolation[1.00000000000000004, {x, 0, 1}]; ...
2answers
430 views

### Permanently rounding numbers/values to a given number of significant figures

I am searching for a simple way of rounding and setting an input to a desired number of significant figures. There are a vast number of posts that discuss similar problems, but none address this ...
0answers
8 views

### ALS Matrix Convergence [migrated]

I came across this statement in some MapR documentation on ML in Spark: ALS is an iterative algorithm. During each iteration, the algorithm alternatively fixes one factor matrix and solves for ...
2answers
491 views

### A problem about function N

Toady,I have a problem about N,described as below: For example N[1/3, 5] (* ==> 0.33333*) and ...
1answer
49 views

### Solving and Plotting Infinite sums over solutions to transcendental equation involving Bessel functions

I am trying to use Mathematica to plot the following equation $E(q,\Delta)$ vs $qa$, for set values of $D \Delta/a^2$ and $\bar\rho a/D$. I have looked at other stackexchange posts which deal with ...
0answers
36 views

### Why doesn't N[0.33333, 3] return 0.333? [duplicate]

Basic question, other answers I found didn't really seem to address this. N[x,3] seems to only work if x is analytic instead of ...
0answers
20 views

### How to fit small squares in the big one? [on hold]

Suppose, I have a square S with height H and width W. Also I have another square ...
1answer
70 views

### What options for project development exist if the Cloud and Mathematica Online cannot be used

Due to contractual obligations to protect IP and client information, we unfortunately, cannot use Cloud or Mathematica Online for development in the development of our projects. We are further ...
0answers
20 views

### Getting just a number out of a list [on hold]

Witht the command dummy1 = Position[Subsets[Range[n]], {3, 4, 5}] I am getting a list of the form {{26}}. Is there any way to get just the number 26 as an ...
3answers
63 views

### Moving a plot label along with a moving threshold line

Here is a simple Manipulate expression with a threshold. ...
0answers
42 views

### Get asymptotic form of a Legendre function expression [on hold]

How to get the asymptotic expression of the first element of the following list with small x and very large n? ...
0answers
21 views

### Defining a differential form in the Exterior Differential Calculus package [on hold]

I want to define the following differential form $\qquad F = H^{01} dx \wedge dt$ However, when I type F = H^01 d[x]⋀d[t] I get the error Recursion depth ...
0answers
66 views

### Solve equations with Monte Carlo

I am dealing with a complicated problem. I will use a simple problem to explain it. I have two variables x and y, and two equations: x+y=A 2x+y=B The value of A and B is determined by measurement, ...
1answer
156 views

### planar Conic Sections plot

Among answers of ConicsAssemblyQuery, I posted images that are not pretty. In particular, the parabola is elusive due to large parameter step. Please help. The program attempts to translate and ...
4answers
1k views

### Does Mathematica have a built-in date picker?

Does Mathematica have an interactive date input control that lets the user choose a date by browsing to a calendar view and returning the selected date as a date list? For example, something like the ...
2answers
300 views

### Can your Mathematica do the following integral?

Backslide introduced in v10 and fixed in v10.4.1. I was trying to do the following integral in Mathematica: Integrate[(z-2) PolyLog[2,z]Log[1-z]/z^3,z] What I ...
2answers
160 views

### How to speed up Integration of interpolation function?

I have a list of data, and I interpolate it to a function. Then I need to do an integration with the interpolating function. But I found that the speed is unacceptably slow. My data is here (a little ...
4answers
3k views

### Convert spectral distribution to RGB color

Presume that I have a spectrum as a function of wavelength (an example being the blackbody spectrum): I want to convert that to a single RGB color to display on-screen, i.e. the "color" of that ...
1answer
303 views

### How to use Get on a folder

In the documentation for Get it says: If the file found by <<name is a directory, the Wolfram Language will try to ...
0answers
39 views

### Extract Infromation from TransferFunctionModel [on hold]

I have a MIMO TransferFunctionModel and what I would like to do is get the transfer function of $j^{th}$ output to $i^{th}$ input. I just want to access this particular transfer function and do ...
2answers
107 views

### Visibility Graph of Polygon

Could anyone provide a function that takes a polygon as input and outputs its visibility graph ? Visibility Graph If not, is there a function that checks whether a line segment lies inside a polygon? ...

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