All Questions

396 views

Combining two lists [duplicate]

Possible Duplicate: How do I obtain an intersection of two or more list of lists conditioned on the first element of each sub-list? I would like to combine two lists. ...
718 views

How can I understand the result Mathematica returns from DSolve?

I have solved an ODE using DSolve, but I have a problem with understanding the solution. In general the solution is in the form: ...
197 views

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193 views

What is the fastest way to split a number into parts?

I have very large numbers (million digits). number = A*10^partlen + B As of now, I split the numbers by this way: ...
598 views

Use selfdefined ColorFunction to encode z dimension with predefined limits

In my last question we defined a colorfunction cf. Now I want to use this ColorFunction for a number of different plots (...
277 views

Table not working with Plot

Because NIntegrate[] does not support parallel computation out of the box, I'm doing a simplified version by breaking the integration limit into pieces and using ...
199 views

Order of operations for the Table function [duplicate]

Possible Duplicate: Using pure functions in Table I have run into a situation that I do not understand when trying to generate a nested list of pure functions. I have the following code. ...
132 views

Return a string from a vector containing a string and a number

I currently have a List of the form, {{String_1, 8.}, {String_2, 101.}, {String_3, 37.}, ..., {String_n, 28.}} Along with another list, ...
254 views

Inputting two arrays for a module in Mathematica

I am relatively new to the Mathematica enviroment and not sure where I am going wrong. I have evaluated the question and understand it, but dont know how to exactly create a module for it. The ...
312 views

Making a screen icon by Mathematica

Is it possible to make within Mathematica an image file to be used as a screen icon? Could you kindly give an example?
300 views

Why is NDSolve solving in term of two 1st order ODE slower than 2nd order?

As mentioned in the documentation for NDSolve it's often convenient to reduce a 2nd order ODE to a system of first order equations. When I do this however I seem to see a significant speed reduction ...
403 views

2 non-linear equations with 2 unknowns which I cannot solve

I have the following equations and I would like to solve them in Mathematica anyway. Numerical results are very much welcomed. However, when I use the command ...
2k views

Plot cubic root which includes the negative graph [duplicate]

Possible Duplicate: Finding real roots of negative numbers (for example, $\sqrt$3${-8}$) Yes, I know there are other Threads which have similar questions and yes I read them but I am just ...
277 views

Combining lists with common elements efficiently [duplicate]

Possible Duplicate: Computing the equivalence classes of the symmetric transitive closure of a relation I am required to process sets consisting of 2-element subsets of integers by ...
279 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 ...
145 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 ...
599 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 ...
152 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 ...
289 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 ...
239 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 ...
187 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 ...
227 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: ...
185 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 ...
347 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.). ...
2k 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 ...
193 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. ...
332 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 ...
104 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 ...
56 views

How to ensure efficient order of operations for rules, slots, substitutions?

I need to calculate several functionals Q[[t]] of a pdf f[x]. ...
674 views

How to find volume of an egg [closed]

I am a first time user of mathematica. I've been trying to figure out how to find the volume of a) f(x)=(ax^3 + bx^2 + cx + d)sqrt(1-x^2). I have been scouring the internet for a solution on how to ...
88 views

Is it possible to mark a Tree node and path to it?

I have the Tree : ...
68 views

Splitting a list of lists

What would be a nice way to split the list list = {1,2,3,{a,b,c},4} into {{1,2,3,a,4},{1,2,3,b,4},{1,2,3,c,4}}
64 views

Differentiating two tables x and y?

I have two tables x and y with x={673,674,675,...} and y={0,1,2,...} and delta=dx/dy. I would like to know how delta can be calculated knowing that delta is the derivative of x divided by the ...
155 views

Help Please : Error in plotting the solutions of FindRoot

I want to find the roots of an equation using FindRoot as a function of a real parameter K and then plot the real and imaginary solutions vs. the parameter K. The function I'm trying to find the ...
45 views

Do, Write Through

Using: Do[Write[OUTFILE, #] & @@ Through[{(#) &, Sin[#] &, Cos[#] &}[n]], {n, {1, 2, 3, 4}}] results with file content: ...
102 views

How to draw the following plot in mathematica? [duplicate]

I have a function (x^2-9)^2. I can plot it with x-range{-3,3} so that three extremum s can appear in the plot. I add another axis y ranging{0,10}. I want to plot the previous function (x^2-9)^2 at ...
42 views

Is there a fast method to open the Format> Font dialog? [duplicate]

I would like to rephrase my older quastion about shortcuts. Excuse me for any possibe dublicates! My problem is that I spend a lot of time to go to menu Format> Font> choose a font and a font ...
53 views

Output of matrix in FortranForm

matr2 = Table[FortranForm[matr[[i, j]]], {i, 4}, {j, 6}] but i want output to be more like this matrix(1,1)=a11 output in ...
22 views

A question about conditional replacement [duplicate]

{g[x, y, z], h[x, y], f[]} /. (f_[t___] /; f != List) :> Plus[t] Why is the output of this expression ...
48 views

ContourPlot of an ImplicitRegion defined by the intersecton of equality and inequality

I want to plot a line defined IMPLICITLY by the intersection of an equality and an inequality, i.e. a line that you can't easily simplify (and therefore take advantage of its form). Consider for ...
35 views

How to plot morphological stripe near the mouse-clicked position in an image? [duplicate]

I tried to use EdgeDetect and MorphologicalComponents to get the image edge elements. When I clicked on an image, I want the edge element nearby to be highlighted or plotted. Here is my code. Two ...
77 views

I do believe this sort of similar questions had been asked many times, so I have read a LOT. For example this and this as well as many other related posts. But a glance at what my main question is ...
99 views

Generate Matlab figure

I am currently working on a project. Because of lack of communication between my team mates and I, I did most of the work (and the graphical figures) in mathematica. Now, I have to pass all the ...
83 views

How can I resolve the insufficient memory to complete the computation problem for solving function with iterated variables?

I am trying to solve for a value x in a function where the variables varies with iterations of K. Also, there is one variable called "rvsum" which is updated with a certain formula as well. I have ...
55 views

How to set the boundary fixed and apply the Young's modulus in Mathematica's FEM? [duplicate]

Provided the drawing .stl is given, and the Young's modulus is know, how to start a FEM vibration mode test in Mathematica? The boundary is required to be fixed and the interested focus is on the ...
119 views

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247 views