For help with mathematical questions arising from software such as Maple, MATLAB, Mathcad, Pari/GP, R, and the WolframAlpha website, etc. Consider posting questions about Mathematica at the Mathematica StackExchange instead. For GAP, SAGE, and MAGMA, one might use tags (computer-algebra-systems), ...

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11 views

Software for drawing hypegraphs? [on hold]

I should draw some nice-looking hypegraphs for my bachelor's thesis, but I could not find any suitable software to do so.
0
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0answers
32 views

Finding the Centre of a Circle using Software [closed]

I have the following image, and want to pinpoint the exact pixel-coordinates of the centre of the large circle in the middle. Is this possible using any freely available software?
3
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1answer
33 views

Recommend of English video about math

My mother tongue is not English, but sometime there are some math reports or conference using English .Because my English is poor, I can't understand it well and can't suitably describe my question. ...
0
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0answers
12 views

SQP with non linear constraints

I am asked to solve a $SQP$ problem using Matlab, in the instructions for writing the code I am supposed to create two functions one for the function $f$ to minimize and one for the constraints $c_i$, ...
0
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0answers
15 views

Using optim and fitdistr in R to find parameters

I am using R to fit distributions. I have been given the data and have been asked to find the optimised parameters(for lognormal, weibull, exponential and gamma functions) using: 1) fitdistr and 2) ...
2
votes
1answer
69 views

Free programs to draw graphs?

allow me to draw graphs, lines, curves such as parabolas, set intervals with sliding bars etc. I have tried geogebra but it is very limited and is a pain to use. For example, you cannot set a line to ...
0
votes
1answer
34 views

Integration in Maple 16

I need to solve this integral in Maple 16, I've tried various functions such as evalf, solve, ...
1
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1answer
34 views

Study of specific Quotients of a $p$-group in MAGMA

In Magma, I wanted to do a program, but since I was getting errors in "basic" commands, I am in trouble. Here I will describe a problem to be done in MAGMA, then its interpretation in MAGMA. I would ...
0
votes
3answers
37 views

Explanation of sums

How would you explain this notation in plain English? I am having issues getting my head around the meaning of the summation symbol. $$ x = \frac1n\sum_{i=1}^n x_i\;. $$
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votes
2answers
27 views

How to load Maple package ??

I have downloaded second version of DGApplications to work with abstract Lie algebra. The file is actually .mla file and it is executale(as when we open it, a prompt ask, "do you want to execute this ...
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0answers
27 views

Software of symbolic computation

In Riemann geometry, there are many complex compute , for example in the picture below.If want to get 2.5.16 it needs about 3 page to compute. And it is easy to mistake because it is complex. But the ...
-1
votes
0answers
8 views

Graph a 3d function in autocad…

This question is related to math software. I use autocad quite a bit to create images for my papers. Suppose I have a drawn an object in the 2D plane, and I want to pull it into the 3rd dimension ...
-1
votes
1answer
22 views

A Basic Question E-views

I ask a question about E-views. Is the P-value in the picture less than 0.05 or greater than 0.05? I'm confused because of the presence of the sign '<' in front of 0.10. Please help mee. Thank you. ...
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0answers
28 views

Finding best fit curve via 2nd order polynomial

I've set of data points and I need to best fit curve by using $y = a + bx + cx^2$. I know the method of finding $a,b$ and $c$. After getting $a,b,c$; How to use that equation to determine the points ...
0
votes
1answer
60 views

Using IEEE floating point standard in math-software. [closed]

For purposes of given math module (that performs some statistical computations) it's sufficient to store reals in IEEE754 floating point format. I'm considering to migrate to SQLLite as persistent ...
0
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0answers
33 views

Curve of all points C for which $|AC|=|BC|$ and $BC \parallel g$ …?

sorry for the title being a little bit weird. The full question is: Let's take two non parallel lines $g$ and $h$ and a fixed(!) point $A \not \in g$. Now take a look at all triangles $ABC$ for ...
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0answers
20 views

Hirota's Bilinear Form

My query is related to conversion of PDE into bilinear form using some transformation. The detailed description about bilinear forms can be seen in book of Yoshimasa Matsuno . The bilinear operator ...
3
votes
2answers
64 views

math software - permutation group elements operation

I need a software allows to calculate operation elements of permutation group. For example the following elements operation yields identity permutation $$ (1234)(1423) = (1)$$ Sage seems to solve the ...
0
votes
1answer
69 views

Compute Ext with Macaulay2

I want to compute Ext with Macaulay2. I see in the website they write how to do but I can not do. Can anyone help me with an example? For example, let $S=k[x,y,z,t]$. How compute ...
0
votes
0answers
108 views

Adding grid on 3D surface in GeoGebra 5

I have made a file with GeoGebra where I visualize a conical intersection. The standard appearance of the surfaces is a dull, colored surface, like shown in the attached figure. To better get a sense ...
0
votes
1answer
18 views

Computing difficult Fourier series numerically - software recommendation

I need to compute some pretty complex Fourier series of function like this one: $$ f(t) = \quad \begin{cases} 1+e^{-t}, & t\in [0;1)\\ 2, & t \in [1;3) \end{cases} $$ Rewritten to "one-line ...
0
votes
1answer
31 views

My brain doesn't work right now: What's the formula for the $n$th vertex of a discretized sine wave?

So far I have: $$ A \sin(2\pi f ? + \phi) $$ where $f$ is cycles per second, and $\phi$ is in seconds. If I'd like to approximate the sine wave with $N$ points per cycle, and I want to draw $C$ ...
5
votes
0answers
49 views

Are algorithms for elimination of quantifiers over the reals practical?

I wanted to find the semialgebraic set in the $(a_0,a_1,a_2,a_3)$ space that guarantees that there exists at least one real root of the general polynomial equation of degree 4. For that purpose, ...
0
votes
0answers
27 views

No graph shown on Microsoft Mathematics

When I try to graph this formula, $$y=\sum^x_{n=1}[n*\sum^n_{m=1}\sin(\frac{m}{n})]$$, the graph shows nothing. I thought it is possible that I input it in wrongly or the software can't solve this ...
1
vote
1answer
42 views

Is there a good program to download or online for plotting certain functions in 3d?

I am interested in a program that can plot me, without too much trouble shapes in 3d, when I type in the function. For example a elliptical paraboloid and an ellipse of the same time, so I can analyze ...
5
votes
1answer
107 views

Amount of zero in a range

I'm stuck with a calculation. If a person would write down, Everytime he sees a zero and counts +1. 10 counts as 1 zero. 100 counts as 2 zeros. 1000 has 3 zeros. 1005 counts as 2 zeros. Is there ...
1
vote
0answers
21 views

How to perform a quasiconvex optimization

I have a quasiconvex objective function $f:\mathbf{R}^n\rightarrow \mathbf{R}$ which I would like to minimize over a simplex $S\subseteq \mathbf{R}^n$. I have looked pretty hard but have been unable ...
0
votes
1answer
23 views

What is wrong with this code (SCILAB)?

i wrote this on scilab: function q=arrow(x0,y0,z0,a0,r,s) j=1; ...
0
votes
1answer
11 views

Given a line segment from $A$ to $B$, and a scale of your view of space $sx, sy$, how do you preserve width of line?

So I'm using PyQt5 to do 2D rendering for an LED light show creator app. The light shows are graphs where the $Y$-axis is LED brightness level and the $X$-axis is usually time. I have a zoom feature ...
1
vote
1answer
22 views

Graph a function of two variables online, with the output rendered as color

Are there any online utilities to graph a function of two variables online, with the output rendered as color in some way (for example, red to green, black to white, hue, etc...) Wolfram Alpha comes ...
1
vote
1answer
24 views

Program to create graph with modified bessel function

$$e =\frac{1}{x}\frac{I_{1}(2x)}{I_{0}(2x)}$$ $$e =\frac{2}{1+\sqrt{1+x²\frac{8}{3}}}$$ $$e =\frac{1}{\sqrt{x\frac{4}{3}}} ...
0
votes
0answers
20 views

Solve the cubic function (using graphing software)

Let $$f(x) = 2x - x^2$$ and $$g(x) = ax^3 + bx^2 + cx + d$$ where $a , b , c , d$ belong to the set of real numbers, and intersect at two points $P$ & $Q$. These points are also two points of ...
2
votes
2answers
82 views

Is there a site to draw a curve and get the equivalent equation?

I know there are many sites where we can input the equation and get the curve of the function (examples here, here and here). What I want is the inverse: I have an idea of how I want the curve to be, ...
0
votes
0answers
75 views

Running time comparison of algorithms

Which math software or programming language one should use in order to compare run times of two number theoretic algorithms ? I use PARI/GP but I am not sure if this is a right choice .
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votes
1answer
33 views

Can you graph these kinds of equations with any free programs?

http://www.walkingrandomly.com/?p=19 I've been trying to find a way to graph this function without buying Mathematica but I haven't found a way. It might be possible with the free online Wolfram ...
4
votes
1answer
49 views

How can I draw plane distributions in $\mathbb{R}^3$?

I see so many nice pictures of contact structures, integrable plane distributions, etc., in manuscripts and online and I have absolutely zero idea how they're made. For example, the following image ...
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0answers
40 views

Topology libraries

I have been searching around for a library in some programming language (Java/C++/Haskell/python,etc) that can define topological entities and manipulate them. The only references I've found are to ...
-1
votes
2answers
85 views

If $h$ divides $|G|$, not necessary that $G$ has a subgroup of order $h$

if $h$ divides $\# G$, then it is not necessarily that $G$ has a subgroup of size $h$ which can be related to Lagrange Theorem $[G:H]=\frac{\#G}{\# H}$ in the case when the subgroup exists, ...
1
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0answers
49 views

Lagrange theorem demonstrations in GAP with cosets and cardinalities? [duplicate]

The goal of this question is to introduce basic group theory concepts with GAP: examples about alternating groups, cyclic groups and demonstrate the Lagrange theorem $[G:H]=\frac{\#G}{\# H}$. ...
1
vote
2answers
71 views

Is a function in an ideal? Verification by hand and Macaulay 2

Suppose $$f_1=-4x^4y^2z^2+y^6+3z^5,$$ $$f_2=-4x^2y^2z^2+y^6+3z^5,$$ $$f_3=4x^4y^2z^2+y^6+3z^5,$$ $$f_4=4x^2y^2z^2+y^6+3z^5$$ and $$I=\langle xz-y^2,x^3-z^2\rangle\subset\mathbb C[x,y,z].$$ Is ...
0
votes
1answer
30 views

Group theoretic multiplication table analysis software?

Consider a number of different multiplication tables, the results from a graphical parametrisation problem. The goal is to understand which group generates each table or sufficiently close to ...
2
votes
0answers
134 views

NAUTY algorithm [closed]

NAUTY is a Graph Isomorphism(GI) software developed by Brendan McKay to test isomorphism of Graphs. It provides a practical solution to the Graph Isomorphism problem. It is a program for isomorphism ...
1
vote
2answers
54 views

Software to calculate an integer sum?

There is a result I want to calculate, but I don't know if there is any software that can help me with this. Anyone knows what could I use to help me? Any answer is much appreciated The formula is ...
0
votes
0answers
21 views

Graph Software, figures

I'm making my own Calculus notes what (free) software would you recommend to be able to make figures like these ones For instance I would like to be able to represent graphically the ...
3
votes
3answers
153 views

What's the equation for a rectircle? (Perfect rounded-corner rectangle without stretching on only one dim)

The equation for a rounded square seems to be: $x^4 + y^4 = 1$ You can make the radii smaller by increasing (over the even integers) the exponents in the equation. Here's a picture: Wolfram Alpha ...
0
votes
1answer
13 views

Having trouble drawing an arc using atan2 and specified range of arc.

I'm writing code. My arc invariant is: $$ \theta_0, \theta_1 \in [-2\pi, 2\pi], \\ \theta_1 - \theta_0 \leq 2\pi $$ where $\theta_0$ is the arc beginning angle and $\theta_1$ is the arc end angle. ...
0
votes
1answer
30 views

Computation of minimal axis-aligned bounding box of an arc segment.

I'm trying to compute the minimal bounding box of an arc segment so when it's time to render it, I only have to examine pixel coordinates within a minimal rectangular region. The code below covers ...
0
votes
1answer
27 views

Software to find eigenvalues

Is there a software (or website) that is free which can find eigenvalues but with arbitrary constants, say $a,b>0$ being involved?
1
vote
3answers
44 views

How to solve the following system of partial differential equations?

I have a system of partial differential equations: \begin{align} & u(a,b,c) \frac{\partial y}{\partial c} = \frac{4}{3} ab, \\ & u(a,b,c) \frac{\partial y}{\partial b} = \frac{2}{3} ac + 2 ...
1
vote
0answers
27 views

Adequate software to plot grids, numerical stencils…

Do you know any software (online or not) easy to understand and appropriate to create this kind of plots? I would like the image to be vectorized, can write subindices, arrows, dots and so on to ...