# All Questions

8 views

### function as argument in a package

I would like to customize the function DensityPlot and use it in a package as a function called MyDensityPlot: The functions ...
22 views

### How to speed up NDSolve?

I have a program where I need to iterate NDSolve thousands of times for different configurations of a diffusion problem. The thing is, I only need about 3 digits of accuracy. I looked thru previous ...
30 views

### Replace pattern for exponentials

Ultimately, I want to replace every Exp[(const) w[i,j]] to T[i,j] and Exp[-(const) w[i,j]] to 1/T[i,j] in the following expression ...
18 views

### Lyapunov exponent of non-autonomous differential equation

I am trying to calculate the Lyapunov exponent for a non-autonomous system using M Sandri code, but it always shows me error "infinite expression 1/0 encountered". Does anyone know about this? Mr. ...
22 views

### Maclaurin Series Help

My problem is to numerically approximate the series (1 - Cos[x])/x over the interval [0,1]. I typed it into Mathematica as so: ...
19 views

### All Graphics3D commands crash

Recently updated from Mathematica 8.0 to 10.2 running on Windows 7 (8.0 was uninstalled before installing 10.2). Anytime a 3d graphics is rendered, the first rendering in a notebook is completely ...
21 views

### NDSolve kernel crash, affected by variable naming

The following isolated example cannot be further simplified much to reproduce a crash. I've already submitted the issue to TechSupport, but it seems this is not an easily reproducible case, so I'm ...
32 views

### Pumping Lemma - non regular [on hold]

Can everyone help me to show that: the language L = {a,b}* \ {a^m b^2 m a^n | m,n >= 0} is not regular. I don't know what is the meaning for the proof.
32 views

### MMA giving me error when I rum the folllowing MMA script

I have the following MMA code. However, when I run it, I am getting some error. But I am unable to trace it. Note that the 0< AverageProbSuccess <1 ...
57 views

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35 views

### Input in Manipulate

Plot[Evaluate[ Input["Please input a function of x to plot with one parameter \ \[Alpha] to manipulate"]], {x, 0, 1}] This work without doubt. But ...
25 views

### Using TraditionalForm to express equations

I have a notebook in which a couple of partial derivatives are calculated. At the time of publishing this notebook, I'd like to make the resulting equations look the way they would in standard ...
23 views

### Bezier curves function in mathematica [on hold]

I need help urgently, for next monday I need to write the name ALAN using BEZIER CURVES programming it on mathematica, but I'm not allowed to use the bezier curves function that mathematica already ...
175 views

### Is there a way to make a bihistogram plot?

Is there a way of making a bihistogram plot in mathematica? There is a reference to it at http://mathworld.wolfram.com/Bihistogram.html but no suggestions as to how to do it.
47 views

### how to apply Alternatives command to delete cases from a list?

I have two lists let say listF = {{7, 2}, {2, 6}, {8, 1}, {1, 7}, {11, 8}, {6, 11}}; and ...
75 views

### Dynamical system problem x(t+1) = Ax(t)

I have a problem that have been trying to solve but it's not going so good. I would like some guidelines on how to work myself around this problem: Two neighboring countries spy on each other and ...
46 views

### How to calculate the slope in a data set plotted in ListPlot?

I am working with a large set of data that follows an exponential behaviour. My challenge is to create a function in Mathematica with these objectives: Retrieve the information from an Excel File ...
44 views

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44 views

### Animation of the wavefield

I was trying to animate contour plot as a function of time. Basically, it is contour plot of wavefield that is changing throughout the time. Here is my attempt: ...
50 views

### NIntegrate[] Gamma Function

Gamma Function is known to be : Source first i plot the function z = 1; f[t_] := (t^(z - 1))/Exp[-t]; gamma = Plot[Gamma[g], {g, 1.0, 5.0}] then, i ...
52 views

### Root of a cubic is not always real [on hold]

In my Mathematica output, the following root object occurs ...
23 views

### Displaying each element of a varying sized list one at a time [duplicate]

I am trying to take a user's input, which will determine as list of results. I would like to show that list to the user, one result at a time. Something like the following (which is broken): ...
27 views

### Image Processing : Detect wall from image for painting application [on hold]

I am new in image processing, I am working on a demo application for wall painter app. Can we detect wall from uploaded image of room or house to paint color on it ? Please help for the same I am zero ...
19 views

### Find a independent variable value from the numerical solutions of a system of differential equations

I have calculated the solutions for the following system of differential equations using NDSolve ...
20 views

### How to make an expression in this case evaluated one step and stop there? [duplicate]

I wonder how to make Symbol@"m" evaluated once so that it becomes a symbol m which is ready to be assigned again. ...
36 views

### How to write a similar “for loop” with table?

I have a code to replace the z coordinate of one point A(x,y,0) on the xy plane: ...
33 views

### How to Simplify Complex numbers Sqrt[1 - i] Sqrt[i + 1] [on hold]

I tried FullSimplify and PowerExpand to simplify Sqrt[1 - i] Sqrt[i + 1] but nothing happen. Help me to simplify this expression
68 views

### Plot of a function w.r.t x^2

I want to plot a function with respect to x^2 i.e., Plot[f(x),{x^2,0,1}], but mathematica is giving error. Suggestions please
69 views

### Delete rows and columns in a matrix based on the element index

This is a follow-up question from here: Define a 4d matrix without for loop I have a 400x400 2d matrix reshaped from a 4d matrix H(i,j,k,l), ...
22 views

### Recursion and Its Stoppage Criteria

Let there be a recursive function V whose first value is set at 0. How can I find its converged value in such a way that the recursion stops when the difference between the newest and the one before ...
42 views

### recursively structuring a multivariate numerical optimization

Suppose that I want to partition the unit interval [0..1] into four subintervals whose max length is as short as possible. I can ask Mathematica to: ...
31 views

### Silly question about linear transformation [on hold]

I define a $3 \times 3$ matrix tran tran = 1/Sqrt[3] {{1, 1, 1}, {1, ζ, ζ^2}, {1, ζ^2, ζ}} Then to do the linear transformation, I use the following code ...
41 views

### How to find first quartile?

I have this set: {131, 130, 130, 126, 125, 125, 123, 123, 121, 121}. I need to find some values, and one of these values is first quartile (...
31 views

### Unable to write to MM3000, stepper motor

Serial interface RS232 control I am using a stepper motor connected with RS232 protocol. But I am unable to write or read. I don't get any errors and I have waited after I open the device and then ...
99 views

### Constrain Locator to specified region

How can I constrain the locator to stay within the region defined by RegionPlot? When the Locator remains within the region, ...
41 views

### Does NDSolve iterate faster in a region where the system being solved is in equilibrium?

I was wondering how exactly the time it takes for NDSolve to iterate through a certain region of the domain depends on the local behaviour of the given system being solved. My guess would be the ...
516 views

### Is there any harm or benefit to Removing unneeded private symbols in packages?

One of the things I noticed is that in typical medium-to-large sized packages, a huge number of symbols are created in the myPackagePrivate context. You can see a ...
23 views

### How to find the longest diagonal if you fold a piece of rectangular paper in half? [migrated]

An 8-inch by 12-inch paper napkin is folded in half three times with each fold resulting in a smaller rectangle. What is the longest possible diagonal for the final rectangle? Express your answers in ...
61 views

### Faster code for calculat in Integral include derivative

I saw this question How I can get faster I tried help that. But I can not understand. I want to write a faster code for: ...
33 views

### Sum over abstract value

My plan is to write a sum over an index. Currently I write Sum[f[OverTilde[q]], OverTilde[q] ∈ Subscript[l, i]] but Mathematica always tells me that "The ...
15 views

### How to stop the kernel between the two input dialog box? [on hold]

I have a code which you could see below and I want the kernel not to pass to the second dialog box until the first dialog box input is entered and hitting OK button. CreateDialog[ Grid[{{"Sonlu ...
46 views

### Duplicate rows with multiple entries

I have a huge dataset, which looks similar to this: ...
27 views

### CDF Player and CloudObjectPrivate` Problem

I'm trying to generate a simple Manipulate[] example showing Taylor expansion. However, the following code shows ...
78 views

### OptionsPattern[] taken as a Replacement Rule

I was trying to write my own plot function taking as unit size cm instead of points. I've tried ...
29 views

### Existence of edge in graph

I want to know whether an edge exist between two specific vertex? Is there any function like EdgeExist[g,{v1,v2}]?
22 views

### Hold assumption in Simplify [on hold]

If you type this into Mathematica, PrimeQ[x] It will return False. However, ...
81 views

### Good way to create a similarity / distance matrix for a large dataset

I have a large dataset with rows (100k+) for products and columns for features. Now I want to create a similarity matrix with NormalizedSquaredEuclideanDistance. ...
33 views

### Trying to solve ODE. Need help with error messages [on hold]

With this code I get an error-message: Equation or list of equations expected instead of True in the first argument. Apparently y'[0] == v0 gives ...