# All Questions

73 views

### Visualize Space Pascal's triangle

Visualize Space Pascal's triangle I found this image on the web, I want to know how to draw with software. I try to search, found this. I have learned a mapping in the plane
36 views

### Different output, simple question [closed]

I found a slightly different output than what was expected in a book. DefSumMod[10] G={0,1,2,3,4,5,6,7,8,9} CircleGraph[G,Add[1]] Why is the tracing directed ...
77 views

### Nullclines and equilibrium point labels

I am trying to draw the vector field, nullclines, and equilibrium points for the system \begin{align*} x'&=2x-y+3(x^2-y^2)+2xy\\ y'&=x-3y-3(x^2-y^2)+3xy \end{align*} I have completed ...
104 views

### Converting between AbsoluteTime and Unix time

By trial and error, I've found that the following gives the current Unix time: AbsoluteTime[] - UPOCH where UPOCH can be defined in any of the following ways: ...
177 views

### Extracting road curves from an image

I have taken several gps readings while driving around town. ...
39 views

### How do I complete this function len for the length of a line segment?

I need to have len[{{x1,y1},{x2,y2}}] is Sqrt[(x2-x1)^2+(y2-y1)^2]. The beginning of the function will be defined as ...
37 views

### return multiple properties of financialdata

Sorry, very silly newbie question.. regarding FinancialData, how to return multiple specified properties. eg. if I want Open & Close properties , or perform an operation such as Open-Close ...
27 views

### Implicit region is not “valid” in ParamatricNDSolveValue function?

I am trying to solve a geometric problem with relation to my Schrodinger equation and its boundaries. Here is my code: ...
15 views

### Collecting and simplifying polynomials [duplicate]

I want simplify some expressions but also using an ordered form for a polynomial. Collect[..., Q, Simplify] should do the job, but sometimes the results does not ...
23 views

### Feasability question about object tracking in 3d space

Is it possible to use 3 different webcams to track an object in an xyz axis. If so, how would one do it?
32 views

### Better control of vertex positions in GraphPlot?

I am trying to graphically visualize a sort of a transformation network. My program generates a list of vertices and edges and I want to turn that into a visually clear graph fulfilling a few ...
87 views

### Solving the symbolic quadratic equation ax2 + bx + c = 0 [closed]

I need to ask Mathematica to solve the symbolic quadratic equation ax2 + bx + c = 0. Does it give you the right answer?
38 views

### Surface Plot 3D of a strongly concave shape

I have a list of {x,y,z} points that all lie on the surface of an object (model output from COMSOL). I would like to generate a graphics object that reproduces the surface. Ideally, I would like ...
145 views

### Is there a bug in MatrixExp in Mathematica v10?

I'm trying to compute MatrixExp[-I t {{0, 1/2, 0, 0, 1/2}, {1/2, 0, 1/2, 0, 0}, {0, 1/2, 0, 1/2, 0}, {0, 0, 1/2, 0, 1/2}, {1/2, 0, 0, 1/2, 0}}] With ver 9 the ...
83 views

### Dynamic arrays and lists with compile (Append, Linked lists etc.)

I have a code that I need to compile. The code contains a loop in which I need to gather data into a list. The question is how to best gather data so that the code works inside Compile. The following ...
53 views

### Is it possible to find $n$ from the sum forming a polynomial? [migrated]

How does one solve for $n$ in: $100000 = \sum\limits_{x=1}^n 1020.2065\ x^{-0.3431}$
46 views

### Having trouble reading this output (pure functions) [duplicate]

I'm after decoupling some odes and trying to solve them using mathematica but my output is in terms of Functions and InverseFuntions and I'm afraid I have no idea how to translate the output into ...
109 views

### How to add a static JPEG into a Manipulate without slowing it down

I´m trying to add an image from a book into a Manipulate but it makes the Manipulate update very, very slowly. So much so that ...
49 views

### Problem with the BarChart3D function

I have a list of values {x,y,z} and I would like to create a 3D bar chart with axis x,y,z . ...
64 views

### The relative motion of the points about the common center of mass

There are 2 points with masses m1 and m2, their common center of mass   rC,r1 and r2 their radius vectors, r=Abs[r1-r2]. I built a trajectory of both material points, as well as their common center of ...
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I am trying ...
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### FunctionDomain doesn't work with If

When I call FunctionDomain for function defined by a formula with If, for example ...
25 views

### The integrand has been evaluated to non-numerical values for all sampling points in the region with boundaries {{0,1},{0,1}}

I am new to Mathematica and I am tring to run the following: ...
114 views

### How to accelerate my code?

Given a 2D $M \times N$ matrix with non-negative values, I would like to find a path going from top to bottom such that the sum of the path is minimum. My function is defined as follow: ...
171 views

### Weierstrass function

I am trying to create plot of the Weierstrass function in Mathematica. I wonder if it's possible, when I define this function as ...
41 views

### What is the shape of the set of integer sided acute triangles with largest side n? [migrated]

I played around with Gauss circle problem and found that if you take a certain sum in reverse and "in forward" and subtract the resulting sequences you get the OEIS sequence: https://oeis.org/A247588 ...
58 views

### How to use DSolve with vectors without decomposing into vector components?

Given a basic, two-dimensional ballistic trajectory problem, I can solve the equations of motion using DSolve (or NDSolve) by ...
66 views

### Are there any instruction(Mathematica-native) to draw an Arc in 3D? [duplicate]

I want to draw an arc in 3D. I viewed circles,ellipses and arcs in 2D with Circle[...] but when I want to draw and arc in 3D I can´t find any instruction for taht purpose. The question is: Are there ...
197 views

### How to make a binary function associative? (Or define an n-ary function?)

Suppose I have a simple function that I assign to an operator f[a_, b_] := a + b CirclePlus = f Then I want to write ...
71 views

### Is there a plot style for PolarPlot to look like matlab polar()?

The plot style of Matlab's polar function appears to be pretty conventional for antenna radiation patterns in the references I'm looking at (sometimes with tick markings that count +- from the ...
88 views

### Projectile motion with air friction

I need to find the x and y components of a projectile's position, its velocity at any evaluation point, time of flight, range, and maximum height. I have already made the code for a projectile ...
118 views

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52 views

### Row echelon form question

I am wondering if there is a Mathematica command that will put a matrix in row echelon form. That is, put  \begin{bmatrix} 1 & 2 & 3\\ 2 & 3 & 4\\ -1 & 0 & 2 \end{bmatrix} ...
45 views

### How to simplify an expression with a radical sign nesting in a radical sign

Is there a function can simplify an expression with a radical sign nesting in a radical sign in Mathematica? I use V9. RatDenmon is a function that can ...
87 views

### Random walk using Module [closed]

I want to create a random walk using Module. The walk start at {0, 0}. At every step, x ...
31 views

### Getting nicer values for eigensystems [closed]

I want to find the eigensystem of the matrix {{0.9, 0.5}, {0.1, 0.5}}. I tried Eigensystem[{{0.9, 0.5}, {0.1, 0.5}}] The ...
28 views

### How can I number an equation associated with its section information automatically?

Suppose I have an equation, which is the 3rd one in section 2, I want it to be numbered (2.3) automatically, is there a way to do that? Thanks!
67 views

### How can I create a shortcut for a command in Mathematica?

I am using mathematica to write my physics homework, one thing that trouble me is that I need to enter lots of vectors. I usually type the name of the vector, "A" for example, and then hit "[Ctrl] 7" ...
70 views

### Block anti-diagonalize a square matrix?

In Mathematica there is a very convenient function called JordanDecomposition[]. It takes a square matrix A as an argument and ...
57 views

### Draw two curves and a surface

I'm trying to draw two curves and a surface, where one of the curves is to appear on the surface. Unfortunately the curves are drawn with very few points and appear extremely unclear. Is there a way ...
38 views

### Sort Unicode characters

Sorting ASCII phrases works fine: Sort[{"albatrob", "abo", "dict", "star", "mangel", "m"}] (*{"abo", "albatrob", "dict", "m", "mangel", "star"}*) But unless I'm ...
95 views

### Projectile motion in Mathematica using Euler's method [duplicate]

I need to write the equations of a ball in projectile motion (ignoring air friction) with an initial velocity of 40 m/s at an angle of 40° with respect to the horizontal. Specifically, I need to ...
60 views

### Is there a way to detach/reattach the Frontend from a running Mathematica Kernel?

I perform long calculations on a fast remote machine running the Mathematica kernel, where I followed the very useful guide Remote Kernel Strategies to establish the connection. I wonder, however, if ...
38 views

### Writing a math formula to order results in a certain way [closed]

I am not very well educated in math and I have a math puzzle that I'm trying to solve. I have the following list and each object has 3 numbers. The first 2 numbers are better when they are as high as ...
434 views

### Find (longest) overlapping elements between two lists

I am trying to write a function f that returns the overlapped sublist where A ends with this sublist while ...
16 views

### How to edit shortcut of setting the style of a cell? [duplicate]

By default, we can use "Alt" + "1-9" to set the style of a cell to be "Title", "Chapter", etc. How can I edit those shortcuts so that "Alt+1" is mapped to "DisplayFormulaNumbered"?
84 views

### TimeConstrained[Delete[Range[1],1]] causes kernel crash

Run these two samples of code here (AFTER SAVING YOUR CURRENT WORK): Do[ TimeConstrained[ While[True, Delete[{1}, 1]; ];, 0.1];, {100}] ...
28 views

### View command-line output in GUI with formatting

Mathematica produces plain-text output when run at the Linux command line. Is there any way to open this plain text output in the Mathematica GUI so that it has all of the pretty formatting as if it ...