1
vote
2answers
110 views
0
votes
2answers
98 views

How to show output of a matrix in m(1,1)=a11 m(1,2)=a12 …in this way…i have 50 *50 size matrix

How to show output of a matrix in m(1,1)=a11 m(1,2)=a12 ...in this way......i have 50 *50 size matrix so i want to do it efficiently. output to be shown like m(1,1)=a11 (in fortranForm) m(1,2)=a12 ...
5
votes
1answer
490 views

InstallR on OS X with external R installation

How do I InstallR on OS X to use my already installed and configured R? Simply using ...
11
votes
1answer
576 views

RLink and R v3.0.1?

Running InstallR["RHomeLocation" -> "C:\\Program Files\\R\\R-3.0.1"] results in a popup box titled "Version Mismatch" saying Error: R.DLL version does ...
3
votes
2answers
191 views

RegionFunction generalized to plot a different colour/style for the largest expression [duplicate]

I have several functions of two variables defined in some region, say functions[x_,y_]:={0,x-y,Sin[x^2-y]} I'd like a plot to show at a glance the regions where ...
4
votes
2answers
121 views

Generating compiled functions from inactive expressions

I am working on a project in which I need to dynamically generate CompiledFunctions from Inactive expressions. For example, I ...
4
votes
1answer
100 views

Slowdown of Flat attributed function

I was trying to write an associative function f using the attribute Flat. ...
5
votes
2answers
134 views

How restore printing of messages?

In the upper left hand corner of my message window, the button reads "Delete all messages". I don't get any messages at all. How can I get messages restored.
1
vote
1answer
124 views

Lists of integers coprime to another list

I have two lists of integers. The first, p, is a list of primes (for example, {2,3,5,7}). The second is a list ...
0
votes
2answers
146 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 ...
0
votes
3answers
114 views

Manipulate list in function

I have some problems with lists and functions. Basically I just want to cut all entries from the right side, which contain 2. ({2,1,2} should become {2,1}) ...
6
votes
4answers
868 views

How to find an approximate solution in a region when Solve or NSolve does not work?

Consider the relation x/Tan[Pi x] == y/Tan[Pi y] Solve or NSolve can't give a solution ...
1
vote
1answer
205 views

NDSolve inside Module with local variables

I want to use NDSolve within a Module and output the solution at some times. (Mathematica 10) All works fine with global variables (symbols) ...
4
votes
2answers
589 views

Best fit equation from a scanned image

I am trying to extract a curve from a scanned graph and find a best fit equation. For example, starting from: How could one find an equation starting from the image file ?
0
votes
0answers
179 views

simulate a 32-bit signed integer overflow in a recurrence function

Considering the following recurring equation: which is this factorial function: I want to find the value of x where f(x) = 0. Actually, the solution is impossible with Mathematica, and it's ...
3
votes
1answer
97 views

Graphs Plotting Discontinuous

I'm trying to plot a graph from the eigenvalues of a matrix I created. The graph shows with discontinuities in it and I was looking for some feedback. Here's the code: ...
8
votes
3answers
2k views

How to create an inverse pole figure color map

To interpret electron backscatter diffraction (EBSD) results, inverse pole figures are used. A three dimensional space of directions ([100], [110] and [111] for those who know about crystallography) ...
1
vote
1answer
164 views

Increase Precision in Numerical Integration

I need to generate a table of Chebyshev expansion coefficients of trigonometric functions (in this case Cos[2 Pi t] to very high accuracy. Code is: ...
1
vote
2answers
204 views

Dynamic nested sum

I would like to dynamically create nested sums with a dynamic number of parameters aswell. We do know the number of variables. Lets say we have 3 Variables with S being an array: $$ i=(1,\dots,m), ...
2
votes
2answers
84 views
-1
votes
4answers
158 views

Eliminate symbols from Lists

I'm working with a list of roots of a 3rd order polynomial family, so i get a list this way: ...
4
votes
1answer
192 views

Producing a minimal Gröbner base

Mathematica has the command GroebnerBasis[{p_1,...},{x_1,...}] that returns a Gröbner base for some set of polynomials. I want to know if there is a command to do ...
5
votes
1answer
121 views
0
votes
1answer
78 views

Consecutive integers that can be written as the product of three distinct primes

Mathematica novice here. I want to start with a list of integers that are the product of three distinct primes m,n, and o, where 2 <= m|n|o < 2000. ...
0
votes
4answers
102 views

How to express “if any component in a vector satisfies that …” in Mathematica

For example, l is a list of vectors. I need to delete from l all the vectors with any component larger than 1. How should I do ...
4
votes
7answers
128 views

Distributing identifiers

I have a list that looks like this: {{"a",},{2010,0},{2011,10},{2012,27},{"b",},{2011,11},{2012,66},{"c",},{2010,19},{2011,20},{2012,}} I want to turn it into: ...
3
votes
2answers
206 views

Adding walls to a region plot

I've done this code: Plot3D[x + y + 1, {x, 0, 1}, {y, 0, 1}, RegionFunction -> Function[{x, y, z}, 0 <= y <= Sqrt[x]]] Producing this image: In ...
10
votes
2answers
259 views

Is there a way to control V10's undo length?

This may be a duplicate (if so I will remove this), but I was having trouble finding the relevant bit of documentation to fix it. I noticed that my FrontEnd memory ...
3
votes
1answer
148 views

How to build a constant Graphics object

I'm making an animation with Manipulate for a representation. The code looks like this ...
4
votes
1answer
708 views

Integrate over piecewise function defined using /;

f[x_] := x /; x<0 f[x_] := x^2 /; x>=0 Integrate[f[x],{x,-1,1}] The above does not work (Mathematica returns it unevaluated), but the below does. ...
0
votes
1answer
129 views

How large can be the dimension of a complex matrix which Mathematica can handle to find its eigenalues?

I have been working with 12 cross 12 complex matrix in Mathematica , I need to work with bigger size matrix of the dimension of the order of hundreds , I was wondering if Mathematica can handle ...
2
votes
4answers
482 views

Removing all values from a list that satisfy a given condition

Suppose I have a list, list = Table[{n}, {n, 1, 5}] (* list = {{1},{2},{3},{4},{5}} *) and I want to remove all values from this list that are greater than 3, so ...
6
votes
5answers
183 views

What is the shortest way to switch between heads of nested functions

consider this example: f[g[x]] what is the shortest way to switch between heads of nested functions to produce. g[f[x]]
4
votes
2answers
107 views

Function pattern to support listed and non-listed arguments [duplicate]

I often want to write functions that take as an argument either a) a rule or b) a list of rules. As an example, when using Replace with just one rule, it does not ...
4
votes
1answer
115 views

Defining a function that prints both the name and value of a variable defined locally within the calling function

To save time when debugging with Print statements, I'd like to define a function -- call it PrintVal -- that prints both the name and value of a variable defined locally within the calling function. ...
0
votes
1answer
50 views

Plot command uses same colors when applying pattern on list [duplicate]

When I do Plot[{fun1,fun2} ./ val1->1,{t,0,10}] then both plots are in the same color! If I use instead ...
1
vote
3answers
114 views

Creating a list of lists as a function of a list

I have a list of length n whose elements are all 1 and -1. For each -1 in the list i want to create a list with a -1 in the same spot and a 1 everywhere else. For example: A list like {-1, -1, 1} ...
0
votes
1answer
107 views

What does the expression “Total[funca[a,#] & /@ #] & /@ {x,y}” possibly mean?

Can the expression be simplified as "Total[funca[a,#]] & /@ {x,y}"? What does the double of "& /@" mean? Where can I find some reference? Updated According to Mr.Wizard's answer, I now know ...
1
vote
1answer
249 views

Error: in the part assignment is not a symbol [duplicate]

I am trying to set part of a Doubly-indexed list aInitialPopulation to cNumHeg. Specifically I am trying to set the 3rd part of the list aInitialPopulatiom[[cNodeNumber]] to cNumHeg. My (attempted) ...
1
vote
0answers
69 views

Would you give me some advice on Elliott's equation? [closed]

I'm trying to solve below equation on mathematica for plotting, but I'm a complete beginner. ...
0
votes
1answer
35 views

MapThread with incompatible length (How to Map twice in the same line)

l and b are two lists of vectors with different length. I need the list of vectors that is constructed by adding each member of ...
1
vote
2answers
110 views

How to plot the movement of points as I change the slider

I have this code that generates an Edgeworth both with two optimum points. The optimal points change as I move the slider. I would like to plot/trace the change in the optimal so that at the end I can ...
3
votes
0answers
144 views

What are the possible values of sub-options for Classify[]?

Specifically, how can I find the possible values of sub-option "KernelType" of option "Method" for Classify? Here's an example: ...
1
vote
0answers
128 views

Symbolic and numeric calculations (and plots) simultanuosly [closed]

I use Mathematica to do a bunch of symbolic calculations (integrals, ...). This is good because I found that sometimes, if I plug in numeric values, Mathematica takes much longer. However, sometimes ...
3
votes
2answers
226 views
4
votes
3answers
259 views

Importing an array from text file and convert it to truth table

I am new to Mathematica, and would like some help in the following operation. I have a truth table stored in a text file. I want to read this in Mathematica, and find its Boolean Rule. Suppose I have ...
0
votes
0answers
62 views

How to control factor gathering in Simplify

To make my results more readable, I need to make MMA gather terms differently. In this example, Simplify gathers terms by common z[]: ...
0
votes
0answers
192 views

“General” strategy to use NIntegrate for multidimension integrals?

I don't have much experience of numerical methods for multidimensional integrals. Currently, the particular function I want to integrate is: $$f(x,y,z,p_x,p_y,p_z) = \frac{p_x^2(2 p_x x(p_y y + 4 p_z ...
2
votes
1answer
63 views

What are the applications of using functions whose heads are also functions?

I noticed that it is possible to construct something like f[x][y]. Displaying this in TreeForm indicates that this expression ...

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