8
votes
2answers
378 views

Recognizing integers in an image

This is the picture I want Mathematica to read I want Mathematica to recognize these numbers and put them in a list. I know that there is a function TextRecognize, ...
1
vote
0answers
73 views

FindPeaks “expecting an image” [closed]

I am trying to use FindPeaks for a list of data, but when I have tried to use it it returns an error. I went to the help menu for the function to check that everything is in the correct format, and ...
2
votes
1answer
198 views

Strange WhenEvent Behavior

Bug introduced in 10.3 or earlier and persisting through 10.3.1 or later Given: ...
1
vote
0answers
45 views

Why isn't Options[] finding all options? [closed]

I've created a plot with 3 non default options. See below. I would like to list these options using the Option[] function. When calling Options on the the plot, ...
6
votes
1answer
73 views

how to test if a string containing boxes is syntactically correct?

This is a string that displays as formatted x^2: "\!\(x \^2 \)" If I left off the closing parenthesis for example: ...
1
vote
1answer
30 views

No of integral solutions with restrictions [closed]

x+y+z+w=n,where x<=w,y<=w. total number of non negative integral solutions of this equation?is there any closed form formula. what is the generalized formula across any number of variables?
2
votes
1answer
62 views

Finding the expansion of $\sin(a_{1}+a_{2}+a_{3})$ on Mathematica [closed]

How to find the expansion of $\sin(a_{1}+a_{2}+a_{3})$ on Mathematica, using $$ \sin(a+b) = \sin a \cos b + \sin b \cos a$$ to the end? I tried FunctionExpand ...
6
votes
2answers
104 views

How to recover “pretty” format after split?

I'm doing this: And get this: But what I wanted is: How can I get the desired output? Is there a way to recover the format from the cryptic output? Note: my "real" list is way longer than ...
1
vote
1answer
100 views

Solving a system of non-linear equations?

I want to solve the following system of equations: ...
6
votes
0answers
82 views

How can I define geographic regions and new entities?

There are three functions (GeoListPlot, GeoGraphics and Entity) related to working with geographic regions but it is not clear from the documentation how to create new Entities or custom geographic ...
1
vote
0answers
77 views

Deriving ordinary least squares (OLS) in matrix form

How can I instruct Mathematica to derive the OLS in matrix form with respect to $\beta$ and obtain the result ${-2X}^{T}(y-X\beta)$? The matrices have the following dimensions: $y_{n \times 1}$, $X_{...
3
votes
1answer
102 views

DSolve with Piecewise Function in System of DEQs

I have been messing around with this problem from MSE, which is given by: $$ \ddot{x} = \begin{cases} -x + c\cdot \operatorname{sgn}(x)& |x| > c\\ 0 & |x|\leq c \end{cases} $$ where $c &...
8
votes
6answers
220 views

An expression for the “perimeter elements” of a matrix

For example (5x5): m = Array[x[##] &, 5 {1, 1}]; MatrixForm@m I want to get a clockwise ordered list with the "perimeter" elements (they could be any kind ...
12
votes
1answer
204 views

How to see a code preview (in Experimental`Explore[] or related GUI)

I have been messing around with built in Experimental`Explore[] function. You can call the function in Mathematica yourself to see what it looks like. It is a GUI ...
3
votes
1answer
84 views

Rasterize alters the quality of the figure

A quick 3D plot ...
7
votes
3answers
94 views

How to organize expression by symbols (like Collect), but apply different functions to each coefficient

I want to mimic the functionality of Collect[expr, {vars}, func], but with the following modification: The function f that is ...
5
votes
2answers
86 views

Parameter of “CopySpecial” can't be “MathML” or “CopyAsTeX”?

Consider the following sample: ...
1
vote
1answer
88 views

Reduce an expression with Sqrt [closed]

r Cos[γ[t]] + 1/2 l Sqrt[1 - (r^2 Sin[γ[t]]^2)/l^2] How can I ask Mathematica to write my expression without l^2 in the ...
5
votes
2answers
163 views

Symbolic integration of SphericalBesselJ

Backslide introduced in v10 and persisting through v10.3.1. Consider the following integral ...
3
votes
1answer
34 views

TensorContract with KroneckerProduct instead of ordinary Times

Is it possible somehow to contract two tensors, say A={{a1,a2,a3},{a4,a5,a6}} and B={b1,b2,b3}, where the elements ...
1
vote
0answers
45 views

Inverted empirical CDF with averaging including BoxWhiskerChart

I'm new to Mathematica and started using it because of interest in statistics. So I've started reading books about statistics and found the problem, that the inverted empirical CDF with averaging ...
0
votes
2answers
45 views

How to restructure a list of {x,y,f[x,y]}-triples for use with Interpolation? [duplicate]

I have lists of triples {{x1, y1, f[x1,y1]},{x2, y2, f[x2,y2]},... }, which I would like to interpolate. In order to use Interpolation[], I seem to need a list ...
7
votes
2answers
149 views

Get association element that has a parameter

Say I have an Association of the form: assoc = <|first->"abc", second[param]->"xyz"|> Now to access ...
8
votes
3answers
140 views

Grouping by total length of elements grouped

How might one split a list of irregularly-long sublists into groups, each of which is shorter than a specified length? For example, given the following input: ...
10
votes
4answers
366 views

Panning with Mouse

This is related to the question i just asked here but not the same. How could i create a manipulate that lets me move the graph to any position i want by clicking and dragging anywhere. Here is an ...
5
votes
1answer
58 views

Multi-case function: many single-case delayed assignments; or one Which[]?

A function needs to cope with many different forms of input, such as different heads (Plus, Times, ...
4
votes
1answer
69 views

How do I keep Speak[] from spelling out words?

When I input Speak["aeiou"] it spells out a-e-i-o-u, but I want it to be pronounced as one word. How do I do this? Is it even possible?
4
votes
1answer
226 views

Solve motion from Hamilton's equations

I have a system of four coordinates and four momenta (conjugates of coordinates). I have a metric tensor $g_{ik}$ and I know the Hamiltonian: $H(p,q,t)=\frac{1}{2}g^{ik}(q)p_ip_k$ For my current ...
4
votes
3answers
154 views

Write Sum of Matrices Explicitly

I have sum of lots of matrices A+B+C+D+E+... and I want that Mathematica shows me this as explicit matrix sum, i.e. Explicit Matrix A + Explicit Matrix B + Explicit Matrix C + .... and not just ...
4
votes
2answers
133 views

How can I get a list of the exponents of a polynomial? [closed]

I have a polynomial 1 + x^2 + x^4 + x^8 + x^9. I want a list of the exponents. {0,2,4,8,9}.
0
votes
1answer
89 views

Venn diagram of all possibles combinations of 5 number

I’m trying to take 5 random integers between 1 and 100, obtain with them all the possibles operations using only each number one time for every operation. ...
3
votes
2answers
109 views

Plotting a DateListPlot and a CandleStickChart together

I'm trying to plot a DateListPlot and a CandleStickChart together. Initially I was trying to add a FinancialIndicator by spelunking TradingChart, but it's quite complex, I think I could manage to do ...
1
vote
2answers
104 views

Epilog doesn't work with ListLogPlot

We have data series: ...
9
votes
1answer
172 views

What kind of patterns in a list of rules would benefit from being Dispatched?

I have a long list of rules for manipulating expressions. They are of the form: ...
0
votes
1answer
87 views

Solving an equation and ODE simultaneously [closed]

I have a differential equation like $y'+a*y+b=0$. I have to find the value of $u=c*y+d$. These are the simplified form of the ODE and equation. Also, I have to plot $y$ and $u$ together.
0
votes
1answer
56 views

Simplify an expression with ArcCos [closed]

How can simplify this expression with Mathematica ? Sin[1/2*ArcCos[x]]^2 Thank you for your help
2
votes
1answer
194 views

Problem with a plot for 1D wave equation solution using NDSolve [closed]

I can't properly use Manipulate for my solution of a wave equation. Can anyone help me? I have the wave equation in the form: ...
6
votes
2answers
236 views

Dynamic plot with synchronization of real time

I want to do a dynamic plot with synchronization of real time, that is, I have a function, f[t], that is a function of time (seconds), so I want to see the curve changing not so fast or not so slow, ...
7
votes
3answers
238 views

Panning by moving Origin (0,0) with Mouse

Given a 10 by 10 grid like the one below and the axis origin somewhere on the grid, I would like to be able to place the mouse pointer at the axes origin (0,0), then press and hold the mouse button ...
2
votes
1answer
115 views

Explicit Contraction of Tensor Indices [duplicate]

Is there any easy way to explicitly contract indices of several given tensors. For example, ...
15
votes
6answers
437 views

How do I insert a calculated value into a text cell?

Suppose in a notebook I've calculated the value of some expression and assigned it to a variable. How do I insert the value of that variable in a text cell without just typing in the value? That is, I ...
3
votes
1answer
181 views

How to continuously run a Python script

I am running this script: script = Import["!python C:\\...python script", "String"]; but I need to run it a few times as it outputs data I need. I run it every ...
1
vote
1answer
60 views

How to export a list of numerical data to a file in the terminal?

I have a very simple program that export a list to a data file in table form. ...
4
votes
1answer
57 views

Export data with the number form but is not same as shown in notebook

I want to export data nicely with NumberForm, However it displays Ok in the note book, but not the exported file. Here is the code: ...
4
votes
1answer
69 views

Search/query the documentation programmatically

I wonder if it is feasible to query the documentation center for e.g build-in functions that contain a "Neat Examples"-section in their respective documentation page. Another functionality that ...
4
votes
1answer
151 views

Phase in discrete Fourier transformation [duplicate]

I asked a question some days ago and it was very well answer. However, I have a new one. I don't understand why the phase of the discrete fourier transformation is not correct. It has the correct ...
6
votes
1answer
103 views

How does Internal`PolynomialFunctionQ work?

I found that Internal`PolynomialFunctionQ performs much better than PolynomialQ. Here is a huge random polynomial in 12 ...
3
votes
0answers
56 views

How to reference a numbered cell

I want to have a numbered celltype, say '1.7.2 exercise' which counts up, when I put in a new cell of this type ('exercise'). Later in the notebook (or even in a different notebook in the same folder),...
3
votes
1answer
94 views

Dsolve and Differential Equation for botnet defence

I am currently using Mathematica to solve $\frac{\mathrm{d}x(t) }{\mathrm{d} t} = cv_{H} (1-x) + \beta x(1-x) - (\gamma_{min} - v_{D}(\gamma_{max} - \gamma_{min}))x$ with $ x(0) = 0$. In the ...
4
votes
1answer
215 views

best way to deploy a Wolfram Language program on a machine without its own Mathematica license?

I have written a small program that accepts a string as input and returns a List of graphical images as output. A simple example is shown below. How best to deploy this on a machine without a ...

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