2
votes
1answer
85 views

How to dynamically update a variable by using mouse over?

I want to extract the Graphics type when I hover my mouse over an object, but I failed to do so. Below is the code I am working on. Any suggestions are welcome ...
4
votes
1answer
159 views

Is it possible to show Tooltips in a ListPicker menu?

Is it possible to show Tooltips in a ListPicker menu? This effect is possible using TabView, but I would much prefer using ListPicker. Below is a simplified version of my code. ...
19
votes
1answer
487 views

Object differentiation in image

After purchasing a box of alphabet pasta for the kids, I wondered if there was way to extract the frequency of appearance of letters in the box by taken a sample and the analyzing the picture. ...
2
votes
1answer
157 views

Expectation of GeometricBrownianMotionProcess

I am trying to compute $$\mathbb E\left[\max\left(\frac{S_{1/2}+S_1}{2}-K,0\right)\right]$$ where $K=100$ and $S_t$ is a geometric brownian motion (with $S_0=100$, drift $r=0.05$ and volatility ...
0
votes
1answer
219 views

Trouble with NMaximize

I am having trouble with maximizing a function I am interested in. Below is the code I am using. ...
4
votes
1answer
232 views

How can I selectively trigger computations in Manipulate?

I have a Manipulate that uses RandomVariate and Random that I would like to have redraw and ...
4
votes
1answer
794 views

Using Mathematica in Conjunction with LyX. Path Issues?

I am attempting make life easier, and, instead of using Mathematica at the same time that I'm using LyX (a front end for LaTeX), I was hoping that I could just use LyX and use the CAS option to do ...
15
votes
1answer
470 views

Highlighting Mathematica code in $\LaTeX$ document

I was thinking about the best way to include Mathematica code in a $\LaTeX$ document with a nice syntax highlighting. I have tried the packages listings and minted (with pygments), which both claim ...
7
votes
4answers
1k views

Controlling ListPlot Line Colors

I am using ListPlot to display from 5 to 12 lines of busy data. The individual time series in my data are not easy to distinguish visually, as may be evident below, ...
15
votes
6answers
4k views

How do you find the frequency and amplitude from Fourier?

Edit This is a popular question with several answers. This edit organises the answers and gives links. Fourier just gives y values (ordinates) if you wish to read off frequencies and amplitudes you ...
2
votes
1answer
624 views

Solve[Tan[theta] == (b*Sin[t])/(a*Cos[t]), theta] breaks when “Reals” is added?

Mathematica solves this equation fine: Solve[ Tan[theta] == (b*Sin[t])/(a*Cos[t]), theta] // InputForm ...
5
votes
0answers
121 views

Make Enter create new line break inside InputField [duplicate]

I would like to write multiple lines of text inside an InputField, using ContinuousAction->True to update some variable ...
2
votes
1answer
1k views

Plot periodic function from Dirac delta function [duplicate]

Sorry for my bad english. I need to plot periodic function from dirac delta: δT(t)=∑δ(t–n*T), where T - is a constant, and n=-20..20 And after them, plot new function fd=f(t)*δT(t) - discrete signal ...
4
votes
1answer
160 views

Searching for closest entry in a table

I have a large table of triplets whose structure is: list=Table[{a,b, RandomReal[]}, {a,1,100}, {b,1,100}] I would like to search through the list by looking ...
0
votes
3answers
345 views

Solving an Integral Numerically

I have been trying to solve the integral equation below, but cant seem to find a way out of this. Can someone please help me out with suggestion? $f(t)=\int_0^{\infty}\frac{K_1a(t)}{a(t)+K_2}\,dt$ ...
7
votes
1answer
349 views
0
votes
1answer
2k views

Finding equation of tangent line at a point [duplicate]

my function is defined as f[x_] = x^1.1 - 2.5 x^.5 I need to find the equation of the tangent line to the curve using the point slope form which would be something like f'[a][x+a]+f[a] a=1 and x=1 ...
3
votes
2answers
114 views

Importing multiple tables within a single file

Suppose I have a file with multiple tables, each separated by a line beak, like this: ...
1
vote
0answers
60 views

Telling mathematica that something is an integer [duplicate]

Is it possible for me to tell mathematica something is an integer? like if I typed Sin[n Pi]+Cos[n Pi] it would tell me it equals 1 for even n and -1 for odd n? ...
2
votes
1answer
112 views

Is it possible to create a manipulate control with lower and upper value

I'm trying to create a manipulate controller to set four value. High and low temperature for both test and use conditions. The four values then go into a calculation. I can set these as four ...
15
votes
2answers
553 views

Generating Gelfand-Tsetlin patterns

I am doing some research on some combinatorial object called GT-patterns. They are generated from three parts of data. Two integer, partitions (sequences of weakly decreasing numbers), $\lambda = ...
3
votes
1answer
234 views

Formatting imported Excel spreadsheet to include tooltips on plot

I have an Excel spreadsheet with numbers on two columns and names in a 3rd. I would like to plot a 2d graph of the first 2 columns and see the respective name from the 3rd column as a tooltip. I ...
1
vote
1answer
236 views

Programming- cryptography

I have defined the following function in Mathematica to get a SET OF m SETS (these sets are the codes {p,q,d,e,n} for the ...
1
vote
1answer
151 views

Need help scoring randomly generated SEC football rankings

So my task is to score all the possible rankings of the 14 SEC football teams and find the best one, using who won in head-to-head games as the sole criterion (so not factoring in strength of schedule ...
6
votes
1answer
500 views

Is there no documentation for Method in Eigensystem?

There does not appear to be any documentation on how to use Method in Eigensystem, or at least not in Version 9.0.1 of ...
2
votes
1answer
94 views

About an elementary limit

Here we have an elementary limit that Mathematica simply doesn't want to compute it. What solutions might I have to fix that? Could you help here? As you can easily guess, the limit is precisely $0$. ...
0
votes
1answer
225 views

Generate encoding from nested list

Taking reference of Huffman code algorithm, ...
3
votes
4answers
390 views

How to apply a function of several arguments to a list?

I have a list of triplets: list = {{1, 3, 5}, {4, 5, 1}, {4, 9, 2}} How can I apply a function f to the last element of each triplet when f the last and ...
1
vote
1answer
528 views

Prevent FullSimplify from converting trigonometric expressions to exponential

There's an option for FullSimplify, which is Trig, and with it I could prevent a trigonometric identities from being used. I'm ...
0
votes
0answers
43 views

Explicit multiplication * sign in Mathematica [duplicate]

I need to turn my Mathematica output (in string form) to a form that I then need to feed to Maple, and specifically I'd need all multiplications to be marked by * (as opposed to x or, as it happens ...
2
votes
1answer
601 views

Extract the left channel from an mp3 file

I'm trying to control where a sound is going to be heard, in the left For example, when I import an mp3 file, and I want to hear it only from the left ear, what should I do? I've never worked with ...
0
votes
2answers
295 views

Extract coordinates from a polygon [duplicate]

I need to extract the coordinates from a 2D polygon then calculate the maximum and minimum of the x and ...
2
votes
0answers
82 views

Function that assigns properties [duplicate]

I want to create a function that creates and assigns properties to a symbol. In theory this would behave similarly to the NonzeroValues property of ...
4
votes
2answers
235 views

How to set up and minimize a large system of equations to resolve the individual components

I am trying to set up a system of 400*N equations to deconvolute spectral data for four different compounds. I monitored 400 different wavelengths in N solvents (3 solvents in this case). In order ...
9
votes
2answers
471 views

Counting and extracting hit circles/triangles for randomly chosen points

Below, you see a triangle in which the incircle was inscribed. As we know, the center of this circle is the intersection of the angle bisectors. At this point, one could go further and find the ...
3
votes
2answers
252 views

How to find the maximum of this function on the positive real line?

I need to maximize this function on the positive real line: $$ \frac{1}{\Gamma(x)^{14}}\cdot\frac{1}{{\frac{323.6}{14x}}^{14x}}\cdot(1.22578*10^{19})^{x-1}e^{-14x} $$ the correct answer should be ...
5
votes
2answers
371 views

How to make binary image from black holes on white background

How to convert black holes on white background, so that I can see a binary image of holes on white image or bright dots on black image. I can create a mask then also I am stuck with bright dot on ...
0
votes
1answer
116 views

Combine multiple outputs into a pane [closed]

Probably unnecessary detail: So here's what I'm envisioning. I have several outputs from different calculations (perhaps several ListAnimated tables of GraphicsGrids of plots). In one, I did all the ...
1
vote
2answers
237 views

FindFit giving weird values on a logistic equation

I was trying to fit a set of data onto a logistic equation, however it ended up telling me that the initial value when $t=0$ is greater than the maximum limit, thus I am led to believe that it isn't ...
3
votes
2answers
254 views

List manipulation after importing txt-file

I have some problems converting data which I imported from a txt-file into proper Mathematica expressions. After importing my data looks like ...
0
votes
1answer
1k views

How can I draw this particular phase diagram in Mathematica? [duplicate]

Sketch the phase diagram for systems with the following velocity functions where a and b are constants with ...
1
vote
1answer
193 views

SmoothDensityHistogram with logarithmic density

Is there a simple way for making SmoothDensityHistogram plots have logarithmic scaling for the density? With DensityHistogram ...
0
votes
0answers
65 views

PolynomialReduce not working

I have a polynomial $f(x_1, x_2, \ldots , x_n)$ with coefficients in $Z[q,t]$, and I have a list of polynomials $g = g_1, g_2, \ldots , g_k$ where they are also polynomials in $(x_1, x_2, \ldots, ...
6
votes
1answer
373 views

ListContourPlot3D doesn't use all points

Edited thanks to @Kuba: In the following example, ListContourPlot3D accepts an array of points spaced at intervals 0.1 apart throughout the volume, but seems to choose an arbitrary number of points ...
1
vote
1answer
1k views

How do I overlay multiple graphics on one plot? [duplicate]

I am plotting n spectrum using: ...
0
votes
1answer
425 views

Calculate the centroid of a group of pixels with the same PixelValuePositions

My question is about how to recognise objects in a image. I would like to recognise objects of the same color. Then I want to calculate the centroid of these objects. I want to apply this calculation ...
3
votes
1answer
116 views

Recursion when randomizing elements in a list

I want to randomize certain elements of a list; Since the code list = {a, b, c, d, e, f, g}; list[[{1, 3, 5}]] = RandomSample@list[[{1, 3, 5}]]; list works fine, ...
1
vote
0answers
422 views

Convolve two sets of (x,y) data sets

I have two sets of data in the form a={{.1,2},{.2,3},{.3,4},{.5,6}} b={{0,8},{.1,4},{.2,7},{.3,1},{.5,10},{.6,3}} Both data sets have even spacing, although ...
3
votes
4answers
413 views

Creating an image from data not in grayscale

I can Import data from excel and create a gray-scale image using Image[data, "Real"] But I want to change from grayscale and as an example use red as the color
1
vote
0answers
196 views

Ticks in ListLogPlot using LevelScheme [closed]

I am using for the first time the package LevelScheme and I don't succeed in ploting the ticks of the logaritmic vertical scale. Anyone with the same problem? I post an example of the problem: ...

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