# All Questions

260 views

### Replace values of a list containing words and numbers

I'm trying to import some data in a .txt file which contains numbers and words. I import a list which consists of four rows of measured data acquired with an oscilloscope, but the acquisition program ...
132 views

### How can define a set of nested parameters

I would like to know how I to define a function with a nested set of parameters (or whatever you would like to call it). For example, how would I get the following function ...
457 views

### How to Solve or LinearSolve $A = I$ matrix equation?

I'd like to solve this equation for $A = B$ where $B = I$, which represents 3 systems of 3 linear equations, for $a, b, c, d, e, f$, without writing LinearSolve 3 ...
151 views

### How to collect q[t] from the following integration

As shown in the following program, the q[t] in a can be collected from the integration by defining the integration of ...
263 views

### Calculating the Mean of a Truncated Multinormal Distribution

First, I'm a little disappointed that Mathematica balks at: Mean[TruncatedDistribution[{{0, Infinity}},MultinormalDistribution[{0}, {{1}}]]] Second, is the ...
223 views

### Symbolically associate vectors and their norms

I am wondering how to handle the following situation: I do have vectors of known dimension that I would like to handle symbolically. I suppose I can do something like ...
94 views

### How to automatically load package in Player Pro by making backup files of init.m? [closed]

I dont know whether I am asking the right question or not but I am curious to know whether we can automatically load the package in ...
172 views

I have made a package BeginPackage["top`"] t[x_]:=MessageDialog["This is top"] t1[x_]:=MessageDialog["This is top1"] EndPackage[] and used the code of this ...
215 views

### How can Time be made to go backwards?

I would like to make a countdown timer, but cannot find a reliable method to make the DateList[] function reverse. The not so robust code for the Digital Clock with the display of seconds follows: ...
164 views

### Backward compatibility issues while DumpSaving Interpolation polynomials

I have bkwrd compatibility issues when I save my NDSolve result (which is an interpolating polynomia) using DumpSave from Mathematica 8 on Windows 7 and then try ...
314 views

### Compatibility of Mathematica Notebooks written on Mac with Windows

I wrote a notebook on Mac OS 10.7.4 and run it on Windows XP at work. On my Mac I use a full version of Mathematia 8.0.1.0, whereas on the Windows-system only a trial version (Version 8.0.4.0.). ...
1k views

### How to write values of function to file?

For example, say I wanted to plot Sin(x) like this: Plot[Sin[x],{x,0,2 Pi}] But instead of plotting to a graph, I want to now tabulate the values of Sin[x] to a ...
348 views

### Exporting Animations under Duration constraints to view on an iPad

I would like to show some eye-movements datas as animation on an iPad. That is to see the gazes as they occured as a function of time. Ideally We would only see the Graphics objects, not the ...
184 views

### NIntegrate is resetting my variables and not giving me a result?

I am trying to check if mass conservation holds by integrating the area under a curve but to no avail. ...
313 views

### Locators and Table within a Manipulate are not behaving

I am putting together a Manipulate on vector addition for my intro physics class and everything works well except when I include a Graphics that has a Table within. The code is below. There are three ...
101 views

### is there an equivalent of “show” steps? [duplicate]

Possible Duplicate: Get a “step by step” evaluation in Mathematica In wolfram alpha, when preforming for complicated integrals there's a 'show steps' option that explains how ...
34 views

### How to show two functions on one plot [on hold]

I am new user of Mathematica. I have G = 2 x + 5 and H = 5 x + 7. I changed x from 1 to 10 ...
60 views

### Integral over geometric region [duplicate]

I'd like to calculate this integral $$\int_E y\ dydz$$ where $E = \{ (x,y,z) \in R^3 : z^2+6 < y^2 < 5z \}$ By hand i've got $\frac{1}{12}$ but i'm not sure, and i'd like to verify this ...
95 views

### Why does Evaluate fail? [closed]

If i use this code: ...
102 views

### How to solve this nonlinear 2 by 2 equations?

I have a equation (x^2 + q1^2 - y^2)/2*(x + q1 - y) + (1 - 2*a)*q + 2*F = 2*(1 - a)*c[q] in q(variable) with parameters q1,a,F and function c(in variable q also, and I define it outside Solve so I can ...
32 views

### Grabbing columns from a matrix [duplicate]

If I have a matrix - exampleMatrix = {{A1,B1,C1},{A2,B2,C2},{A3,B3,C3}}; And I want to create a matrix like - ...
151 views

### Solving One Equation with Two Variables

I am trying to solve an equation with two variables. It is the last step in the process of using the method of undetermined coefficients to solve a nonhomogeneous differential equation. The equation ...
71 views

### Using Wolfram Language without Raspberry Pi [duplicate]

What are the different ways I can start using Wolfram Language even though I dont want to use Raspberry Pi? Are there any convenient ways? I actually have a raspberry pi but I am trying to find ...
38 views

### Abstract algebra: define constants in a finite field

How can I to define a constant in $Z_{2}$? For example, I want to create a constant b that inherits the properties of an element from $Z_{2}$. For example ...
151 views

### Make a scatter plot from two columns of matrix

I have imported my text-type data as a matrix. I want to make a scatter plot (ListPlot) using one column as x-axis and other columns as y-axis. Is there a ...
46 views

### PDE combined with ODE 1D

I try to solve the following system of PDE coupled with ODE: $$\theta_t - a\theta_{xx} + b\kappa_a(\theta^4-\varphi)=0,$$ $$-\alpha\varphi_{xx} + \kappa_a(\varphi - \theta^4) = 0,$$ -a\theta_x + ...
117 views

### Plot3D Not Showing plot

I have a function that I'm trying to visualize and for some reason the plot only shows a small snippet of the graph of the function. The function, d, and relevant ...
135 views

### 3D plot of a solid of revolution

I'm trying to rotate the area between the graphs of $y=3$ and $y=x^2$ around $y=1$. I'm not attempting to just find the area as that would just be ...
71 views

### ListDensityPlot with discrete bins [duplicate]

We consider a table of the form data = Flatten[Table[{i,j,f[i,j]},{i,1,ni},{j,1,nj}],1] The function f[i_,j_] has been made ...
77 views

### NDSolve producing an overdetermined system

I am trying to build the initial model for an electro-mechanical system that I will be running in a for-loop for various inputs and parameters. Currently, the code is as follows: ...
168 views

### Fraction of fibers that have failed

I have the following to set into mathematica. Assume a stress(sigma) applied on a specimen which has a number of fibers within it. All fibers that have a strength less than the applied stress should ...
98 views

### How do I upload a graph as an adjacency list and find the betweenness centrality?

I have an undirected simple graph in a .txt file formatted as an adjacency list like this: 100 200 200 300 300 400 500 600 700 800 900 ... Every number is a node ...
46 views

### problem solving a simple integral equation

I'm looking for a function q(x) so that integral( q(t) , t , x, x+2*pi/3) == a*sin(x)+b Could anyone help me on this one? Thx in advance
83 views

### Vector-calculus [duplicate]

I have a table of 200 elements, elements are '0', '1', '2'. I have participate them into groups for 20 elements each one. Then I have calculate how many '0', '1', '2' are in each part. And then in ...
52 views

### Derivative of generating function (Example from documentation)

In the documentation for GeneratingFunction, the following example is given under Examples -> Properties & Relations -> Derivative: ...
110 views

### How to partition three years of data into daily samples

I'm trying to find mean of temperature data list. The temperature data list has 3 hours steps which means I have 365*8=2920 temperature measurements per year. My data are temperatures of 13 years. ...
35 views

### How to make 3 parameters selection and then execute, and not with each selection?

Manipulate[{u*v}, Row[{Control[{u, 0, 1}], Control[{v, 0, 1}]}], ControlType -> VerticalSlider, ControlPlacement -> Up] Q1.- How to select the operation ...
111 views

### Determinant of a square matrix with univariate polynomial entries is not a polynom? [closed]

I have a 15x15 Matrix with all polynomial entries. I want to calculate the determinant of the matrix. To my understanding the determinant should be a (albeit high order) polynom, too. And the paper, I ...
79 views

### Import LaTeX from Wikipedia to Mathematica [duplicate]

Here is one a problem I land on from time to time. Sometimes while researching, I want to pull a formula presented in a Wikipedia page and import it into Mathematica. I've heard that Wikipedia uses ...
52 views

### Problem with Label in a Do loop, “nolabel” [closed]

Can someone tell me why this code doesn't work and how to fix it ? Thanks. ...
153 views

### Plot not working

I am trying to generate a plot for S2[w]. My code is below ...
139 views

### How to label the coordinates of the plotted graph?

How can I label the coordinates of the plotted graph? I want to label the coordinate of $(-1,-1)$. ...
117 views

### Mapping the imaginary axis of the complex (s) plane

In this problem is very difficult to analyze the roots s. Firstly I thought that the problem is in precision, but I am not sure. The criterion which I want to obtain is that one of these roots has a ...
106 views

### how to store output of a function in a table for future use [closed]

I am new to Mathematica and if this is a simple query - please excuse me for the same. I am trying to solve a equation which is a function of two variables. From the solution, I need to store the ...
95 views

### Why do InputFields not respond in Manipulate utilizing FindGeometricTransform?

In the following code changing the InputField does not result in observing changes in a result from FindGeometricTransform, but ...
168 views

### NMinimize to optimize function Module

I am using Nminimize for simulation based optimization. I define the objective function (simulation with a variable "a") as a module to be used in the minimization. ...
98 views

### Setting plot size within vector; dynamic slider (two part question)

I have a question about the size of a plot in mathematica. I'm working on some differential equations (a simplified model of heat transfer in a building). I've programmed it so that you can set ...
122 views

### Symbolic Constrained Optimization

I have a question regarding evaluating constrained optimization problems in symbolic terms. I would like to perform How can I implement the method of Lagrange multipliers to find constrained extrema? ...
99 views

### trouble with Dynamic range in SetterBar

It appears that I can set the range to a Dynamic variable in a Manipulate control, but not in a ...
70 views

### Why does initialization slow down manipulate in this case?

I'm trying to manipulate a plot of function with some parameters. The function is a long expression, so I tried to put it inside the Initialization options of ...

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