1
vote
1answer
94 views
Simple Macro or Meta Programming for Data Analysis [duplicate]
I have a large number of data variables that are represented in MMA as symbols set to lists. For example:
x = {1, 2, 3};
y = {4, 5, 6};
I want to be able to ...
0
votes
0answers
49 views
Contour plot of an interpolated input variable conditionally as functions of other inputs
I have evaluated a function of three variables.
Under loops of all three variables a list is generated for
the evaluated function.
I now like to have an idea how the first input varies in the
...
1
vote
3answers
53 views
DateListPlot input entry problem
I imported some data from Excel and got the following for my date and values:
{{{1986, 1, 2, 0, 0, 0.}, 25.56, ""}, {{1986, 1, 3, 0, 0, 0.}, 26., ""}
It seems ...
2
votes
2answers
113 views
Adapting “Find and Replace” functionality to work with Patterns
I was thinking if there is something like Find and Replace (Crtl+F) functionality adapted to work with patterns.
Probably not, but it seems possible to create this with some effort and skills in ...
-5
votes
0answers
31 views
4
votes
1answer
75 views
Importing Data with Line feeds
I am trying to import data from a CSV file into Mathematica that contains line feeds in certain elements that I wish to be properly rendered in Mathematica. I suppose this has something to do with the ...
1
vote
1answer
145 views
The best method of constructing a product of consecutive terms
I am new to Mathematica, I am searching for a way to create an expression with a sequence of terms such as:
(x-1)/x (x-2)/x (x-3)/x (x-4)/x … (x-n)/x
2
votes
0answers
45 views
Exporting multiple arrays in a single HDF5 file in Mathematica 7
I am using Mathematica 7 and I need to export a table of data and the corresponding x and y arrays. I would like to format them ...
1
vote
0answers
35 views
NMaximize with matrix input
I defined function f[x_, fixed_] := {...}. Here x is an $M\times N$ matrix. I want to maximize $f$ with respect to $x$. I have ...
1
vote
1answer
65 views
Fixed color scale in multiple density plots with Fixed PlotLegends scale
From the great answer of Mr. Wizard, I would like to learn how to implement the associated PlotLegends scaled too. Here is the simplest example with PlotLegends, which does not look to be scaled:
...
0
votes
1answer
99 views
How to simulate the response of a linear parametric varying system in Mathematica?
Consider the following system
\begin{align}
\dot{x}(t)&=\sum_{i=1}^{2}\rho_{i}(x(t))\left[A_{i}x(t)+B_{i}u(t)\right]\\
y(t)&=Cx(t)
\end{align}
with:
...
2
votes
2answers
93 views
Combine multiple notebook files into a pdf/rtf/word/etc file?
It's the end of the semester and I have a prof who wants me to turn in a printout of the nb files ive worked on. I have 33 separate files, and I was wondering if there was any easy way I could combine ...
0
votes
0answers
51 views
Errors when using NDSolve in one computer, but not in others
I am trying to estimate some values using NDSolve[] together with Map or ParallelMap in ...
1
vote
0answers
46 views
Animated 3D graphics is low resolution [duplicate]
I'm trying to animate a 3D shape in Mathematica 7. It's working, but the graphics is extremely crude while animated. The resolution gets better if I stop the animation. Is there a way to get a nice ...
3
votes
0answers
84 views
InverseFunction on an Interpolating Function is misbehaving
I am getting strange behavior when I try to calculate the inverse of an interpolating function for two similar data sets.
My data sets are:
...
0
votes
0answers
51 views
recurrence relations
If I write
f[i_] := Expand[FunctionExpand[x^(i/5) LerchPhi[x, 1, i/5]]]
for any i < 5, the result is a linear combination ...
16
votes
2answers
353 views
Find radii of concentric circles in image
I have an image of concentric circles, I would like to find the radii of the circles (only the innermost few are important).
I've had a go using what I could find in previous posts, but am a bit ...
0
votes
1answer
42 views
Color of numbers and defined functions [duplicate]
How do I change the color of numbers and the text representing defined functions in my notebook?
4
votes
0answers
55 views
How to export to .html .nb file together with links «in» and «out»
If use «File > Save As > HTML» lines «in» and «out» are lost
To save a document without loss of these lines/links?
6
votes
1answer
90 views
Tooltip not working in web deployed cdf
I deployed a CDF file in a web page. I used both Mouseover and Tooltip functions. They both work in the raw CDF file. The ...
1
vote
1answer
101 views
Finding n-th term of a sequence of functions
Lets say, I have the following series of functions,
$f_1=a+1$
$f_2=a^2+2a+1$
$f_3=a^3+3a^2+3a+1$
Assume that $f_4, f_5,$ and $f_6$ are also known. However $f_n$ is not known as a function of $n$.
...
5
votes
2answers
128 views
How to label axes in 3D plot adequately?
The following code produces plot with axes labels, which are jumping constantly.
...
4
votes
1answer
359 views
Wallis Formula and Pippenger Product---How do we get symbolic output?
The Wallis Formula computes $\frac{\pi}{2}$ OEIS and the Pippenger Product computes $\frac{e}{2}$ OEIS. Here is a combined formula:
...
0
votes
0answers
37 views
How to plot a graph of bay of bengal and marked known two coodinates (lattitude ,longitude) in that graph? [duplicate]
I want to get a map of bay of Bengal and marked two known coordinates in that map.How can I do that ? please enplane me.
118
votes
2answers
53k views
QR Code in shopping cart handle
This week, the market people from my work wanted to put QR codes in shopping cart handles, but when they tested it, the QR code did not work. I noted that the cylindrical curvature (even small) ...
4
votes
1answer
139 views
Mathematica 9 can't integrate this function but earlier versions could
Integrate[ ArcTan[x]/(1 + x) Log[(1 + x^2)/2], {x, -1, 1}]
I used Mathematica 9.0.1 on Windows7 32bit, Mathematica 9 cannot compute this, but Mathematica 8 gives ...
0
votes
0answers
51 views
Algorithm for the Ornstein-Zernike equation with Percus-Yevick (PY) approximation [closed]
I want to solve the Ornstein-Zernike equation using the Percus-Yevick approximation in Mathematica and acquire the numerical solution for the $g(r)$ function. I found a python algorithm here which is ...
6
votes
1answer
100 views
Pattern definition for replacing plus and subtract
Suppose I have two functions $h_1(x)$ and $h_2(x)$, for which we know their sum and their difference:
$$
h_1(x)+h_2(x) = d(x) \qquad h_1(x)-h_2(x) = i f(x)
$$
I have a complicated expression, in ...
0
votes
0answers
51 views
2D list interpolation within restricted domain
I have some 2D neuroimaging data. Each {x,y} coordinate is associated with a value. I want to smooth this data, and have been having some success using ...
5
votes
4answers
145 views
Aligning axes labels on multiple plots
I'm trying to create some "publication quality" figures, but Mathematica is fighting me all the way. So my question is: Should I switch to Origin? Please help!
Well, all joking aside: I'm trying to ...
2
votes
1answer
69 views
How to apply a free-form input Function using InputField
I am trying to take a free-form input Function to create a list using NestList.
...
5
votes
2answers
174 views
How to graph a series of coupled oscillators and watch the wave move along them
Here are the differential equations that set's up the 11 coupled oscillators.
...
29
votes
3answers
481 views
Why are my plots displaying behind the axes?
I need to create graphs with light gray axes and black lines. All of my plots display behind the axes. How can I make the plots display over the axes?
...
1
vote
1answer
67 views
Differing behaviour of GeneratingFunction with different numbers of parameters
When given a single variable sequence, GeneratingFunction is automatically expressed in the most "direct form", for example,
...
1
vote
1answer
43 views
5
votes
1answer
302 views
Image of input and output cells is not exported correctly
Wolfram Blog uses PNG images to display input and output cells in a notebook. For example, the following is an image from Samuel Chen's post:
I should be able to produce a similar image by ...
-2
votes
0answers
65 views
Reduced Planck constant and UnitConvert to Erg * Second
I declared the reduced Planck constant by
ℏ = Quantity[1, "hbar"]
which worked. Now I want to calculate something in cgs units. Therefore, I tried to convert ...
3
votes
2answers
171 views
Create polygon using edge lengths and area
Four-sided convex land plots are usually denoted with edge lengths and area.
How do I create a Polygon Object with these parameters in Mathematica ?
2
votes
1answer
88 views
Reducing exponential inequalities fails
I am quite stumped by this problem :
Reduce[ N^(x-y) <1 && N > 0 , x, Reals]
gives the expected result
...
2
votes
0answers
59 views
How to efficiently count occurrence of some element in a list? [closed]
I have a list of numbers, for example:
list = {1,2,3,4,2,1,3};
what would be efficient way to count all occurrences of some number?
I tried so far:
...
2
votes
3answers
59 views
Write a function using pattern test to test whether the input is polynomial and print error message if not
I am doing this which is supposed to be an easy problem and which I think my code should be correct but for some reasons it is not working. May anyone help correcting my mistakes? How should I write ...
1
vote
0answers
79 views
Shapley value and Mathematica [closed]
I use the TuGames package in Mathematica to analyze
cooperative games. Is it possible to calculate Shapley
value, Nucleolus, etc., for a large number of players like
400 or more?
0
votes
1answer
53 views
Forming product of function of prime factors
Given a list of numbers each containing 2 prime factors, I wish to make a list of the products of the logs of each factor. For example, given
L = {4,6,9}, I would like to form P = ...
10
votes
1answer
82 views
When is the output of examples in function documentation rasterized?
Upon building documentation in Workbench, Workbench sometimes converts the output of examples on function pages into rasterized images, and sometimes not. Does anybody know what controls this ...
2
votes
1answer
86 views
Problem with Sinc[x] function and rounding
I seem to be having some trouble with the Sinc[x] function, and I think it's due to rounding, but I'm not sure.
The code is below, with relevant constants:
...
1
vote
0answers
34 views
3D plot changes it's size while rotating [duplicate]
When I am rotating drawn 3D plot by mouse it rotates Ok until mouse release. After that it slightly changes it's size instantly. Probably it tries to accommodate document layout or something.
Is it ...
1
vote
1answer
64 views
NIntegrate converging too slowly when increasing size of array
I have a problem with a numerical integration. I have a 4x4x4x4 array that has for each entry an integral and I want to use NIntegrate to evaluate it. It gives me ...
1
vote
1answer
58 views
Rounding only reals in an expression containing, reals, integers and symbols
I am trying to make a function that would make rounding real numbers in an expression possibly consisting of real numbers, integer numbers and symbols. An example of such an expression is below:
...
2
votes
1answer
58 views
White spots in ListDensityPlot
I have a problem with ListDensityPlot.
I have some data on an irregular grid.
I try to plot them with
...
12
votes
3answers
1k views
How to do System dynamics simulations / diagrams in Mathematica?
System dynamics is an approach to understanding the behaviour of complex systems over time. It deals with internal feedback loops and time delays that affect the behaviour of the entire system. What ...
