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 tag computer-algebra-systems.

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Solving linear functions with constraints.

I have a table of data, for maximum available items in a given time period. With a constraint on how many of each items I can take in total. When I have taken the allowed amount of an item I can ...
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1answer
119 views

total number of combinations?

Patient Age ---> Avg Visits / Year <1 year ---> 7.5 1-4 years ---> 3.0 5-14 years ---> 1.8 15-24 years ---> 1.7 25-44 years ...
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1answer
121 views

Interactive Equation editor with Latex syntax

I was using the built in equation editor used by Pearson's "MyLab and Mastering" physics course, and I really like how it's both interactive and uses Latex syntax to insert equation elements. ...
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1answer
79 views

Asymptotic bounds. What software to use?

For a pair of expressions ($A,B$), I need to determine whether $A$ is upper asymptotic, tight bound, or lower asymptotic of $B$. For example: $$A = n^{\log(c)}$$ $$B = n^{sin(n)}$$ What (free) ...
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1answer
47 views

Is there free software that can be used to generate a chain rule tree graph?

I'm in multivariate calculus and we just finished up the chain rule. One of the methods for solving this is to produce a tree graph and traverse it. An example would be this tree graph taken from my ...
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1answer
33 views

Where can I find a binary calculator that can do exponentiations, roots and logarithms?

I've searched on Google, but all I found was binary calculators that can do additions, subtractions, multiplications and divisions, nothing else.
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1answer
79 views

How to represent R function dexp mathematically?

I need help representing this line of code mathematically. exp(sum(dexp(x,prop_theta,log=TRUE)) - sum(dexp(x,cur_theta,log=TRUE))) Thanks for your help in ...
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1answer
44 views

Programs for Purple Comet Math Meet

I am going to be participating in the high school division of the Purple Comet Math Meet. Since computers are allowed to be used on the competition, I was wondering if anyone can recommend ...
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1answer
81 views

Is there a program (webbased or not) that allows me to draw freeform on a graph?

I need to draw some graphs for a distance-based course I'm taking where I need to draw graphs that are based on my own estimates, not on a function. All of the websites I'm finding online are based ...
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1answer
28 views

“Dynamic figures”

Which kind of software allows to do things like this one or that one, for example?
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1answer
63 views

Calculate Geometric Series from three things

How can I calculate the gp series from third term,third last term and sum of the series?Is the approach of calculating first term by taking gcd of third term and sum of series correct or not?
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1answer
48 views

Free interactive software for vectors

I'm looking for a free, interactive program that allows me to graphically draw vectors, and at the same time display specified dot products, magnitudes, etc. as I move/resize the vectors. It can be ...
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1answer
332 views

MathCAD: composite function, (fog)(x)

So sorry for the dumb question, but I can't figure this out and I have been searching for the answer and can't find it... and at this point I no longer know what to Google. Using MathCAD, how do I ...
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1answer
57 views

calculating the median in iWorks Numbers from a dictionary of values

I need to calculate the median among some numbers which I have in iWorks numbers. Since I have to do this several times (a few hundreds) I really cannot do it by hand. The numbers reach me (from the ...
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1answer
314 views

Solve 4 A (L^(3/4)) - wL (((24 - L) w)^(-3/4)) = -(((24 - L) w)^(1/4)) for L? Using Mathematica

I'm trying to solve $$4 A (L^{3/4}) - wL (((24 - L) w)^{-3/4}) = -(((24 - L) w)^{1/4})$$ for $L$ using Mathematica, and it spits the following out: ...
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0answers
64 views

Software tools or libraries for dealing with temporal reasoning (visualization/representation).

Temporal aspect of data with no doubts is an important characteristic for many software systems. I'm interested if there are any tools/frameworks for dealing with temporal data for reasoning on it. I ...
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0answers
38 views

On solving non-linear programming problem and the relevant software

I have a non-linear programming problem, in which all the inequality is linear and only the optimization goal is in a non-linear form. The problem is as following. $x_j$ is the variables and $a_{k,j}$ ...
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0answers
45 views

Issues with CVX package for optimization

I am trying to use the cvx package for optimization. However, I am having some issues with it. I have a variable X which is a matrix but I cannot add $X^{-1}$ in the objective function. What should I ...
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0answers
44 views

Question about Maxima

We want to sum up a polynomial WeylNumer(m+n-2*i,2*i+2*k+1-2*j)) for i from 0 to m, for j from 0 to n. What does "map(x->sum(sum(x,j,0,k),i,0,m),WeylNumer(m+n-2*i,2*i+2*k+1-2*j));" mean in Maxima? ...
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0answers
148 views

Computer Algebra System for probability theory

Is there literally any [ preferably free ] Computer Algebra System that would handle probability theory directly? As for now I am mainly interested in calculating marginal densities out of ...
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0answers
232 views

Programmer understanding academic writings on maths

I would like to know in which order I should learn different areas of maths so I can have a robust overview of all the theory in case I need something for a computer programming problem. So I've ...
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0answers
92 views

Concerning The 'Price-Collecting Steiner Tree'

I'm a Master student at the University of Leuven, Belgium. I have to make a report of a case concerning the 'Price-Collecting Steiner Tree'. We have our model and our restrictions. We are just looking ...
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0answers
257 views

Sensitivity analysis on non linear problems

First of all, I would like to apologize if this question does not fit into the "soft" category. I am quite a newbie around here, and maybe I can fail to get the feeling of what exactly is a "soft" ...
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212 views

Coq transparency issues with type class fields

I am having some issues with, I suspect, transparency of fields in type classes. Consider a type class such as ...
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0answers
84 views

question about B.N.F

for example i have a code of strings which is efzau and 47 how can i define a grammar, set of terminal symbols and set of non terminal using B.N.F? Thanks
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0answers
11 views

R^2 in Generalized Linear Models

I am trying to model relationship between predictors and explained variable in R using glm() function. I've found quite good model that gives me satisfactory results. Is there some way how to ...
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0answers
23 views

why do I get imaginary number using Discrete Fourier transform?

I am looking for an approximation for Poisson binomial distribution: The Poisson binomial distribution is the discrete probability distribution of a sum of n independent Bernoulli trials. you can ...
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0answers
32 views

Implementing odd and even functions into PARI/GP

My elliptic curve is $y^2=x^3-3267x+45630$ and I have the following code to generate $DD$ mod 1789 where DD is the sqrt(denominator) of the x-coordinate. ...
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19 views

Computational verification request

Let $I(x) = \sigma(x)/x$ be the abundancy index of $x$. Note that $\sigma$ is the classical sum-of-divisors function. Previously, I computed for $u$ in the inequality $$\sqrt{3} < ...
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0answers
12 views

models to experiment with game theory?

I want to learn game theory from a practical point of view. Does anyone know if there exist programs that illustrates the utility of game theory? Or books that contains MATLAB simulation of games? ...
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0answers
35 views

Geometry software

I have some computer graphics programming experience, not so long ago, I understood that I haven't grwat experience in math and there is some problem. So, im learning math and coding at the same time. ...
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0answers
30 views

How do I put this differential equation into mathcad 11

$$\frac{d^2y}{dt^2}+\frac{dy}{dt}+2y(t)=sin(t)+2e^{-2t}-2$$ I want to put this into mathcad, and then solve it numerically. I would also like to plot the solution. Sorry for the link, wasn't sure ...
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0answers
11 views

Engineering - Appropriate concrete grade for supporting structure under wind loading?

I have a concrete tower/pier/supporting structure for a bridge. As part of the design, I need to consider SLS checks for wind loading on the tower before the deck, cables etc are built, so ...
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0answers
43 views

QQ-Plot on R for censored data.

I have plotted a qq-plot on R for a data set which is assigned the value -0.25 for any values below -0.25. However on the qq plot it plots all the -0.25 points, I have been told there is a way to plot ...
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0answers
143 views

Low rank approximation using CVX toolbox in Matlab

I try to use CVX toolbox to do "low rank approximation" work. The code is as follows: ...
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0answers
15 views

Form Poset from (Non-zeta) Matrix

I have a matrix (well, really a table) of values that are the results of various indicator systems. Naturally, each system is slightly discordant, so no one true ranking exists. I'm looking to form ...
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0answers
68 views

Calculations in McLain groups

Is there any program in GAP or other softwares doing calculations in McLain groups and finding subgroups etc. For the McLain groups see Derek Robinson's book: A course in the theory of groups, p347 ...
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0answers
61 views

Can a Computer Algebra System 'experiment' with expressions?

I have recently been reading about software for symbolic manipulation, and I can see its use as a tool for performing large calculations that would be unfeasible otherwise. Given that these systems ...
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0answers
36 views

Tool for differentiating a matrix and solving a matrix equation (in closed-form)?

Is there any software or online tool that can analytically solve a complex matrix equation, such as the following one in closed form (not numerically)? $$\frac{\partial \; ...
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0answers
40 views

Subject to in equation

I have the formula below: $$\hat x_2=\arg\min\lVert x\rVert_2\quad\text{subject to}\quad A{x}=y.$$ But I didn't understand what was meant by "subject to" ? does $x$ is replaced by $x_2$? please can ...
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0answers
42 views

How to reduce a graph via decomposition?

Is there a Java / C# library that can be used to reduce a graph via decomposition? Or could someone point me to a good tutorial where I can learn all these? E.g.
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0answers
41 views

calculation of an integral via PARI/GP

I just started to use PARI/GP and I have a question that's been so strange to me. Here are the codes: intnum(x=1,2,frac(x)) = 0.50000... intnum(x=2,3,frac(x)) = 0.50000... intnum(x=1,3,frac(x)) = ...
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0answers
52 views

Computer-aided study of elementary geometry

As a beginning student of elementary (euclidean plane) geometry, so far, I have gotten the impression that there are two major approaches to geometries: naive vs axiomatic. Being a humanities student ...
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20 views
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0answers
104 views

Geogebra - constructing the smallest circle that contains a triangle

I want to create a Geogebra demonstration of the smallest enclosing circle of a given triangle. The Geogebra tutorial shows how to create the circumcircle of a triangle (by calculating the ...
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0answers
112 views

Applet to find least-crossings drawing for an input graph

Is there a convenient online applet that allows me to draw a graph, after which it outputs a plane drawing of an isomorphic graph that has (approximately) the least number of crossings among all ...
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0answers
81 views

Simple Application to model matrix transformation of basic geometric shapes

I've been searching the internet for a simple, free, application that will allow me to experiment with matrix transformations on a 2D and/or 3D graph of geometric shapes. For example, I'd like to ...
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0answers
499 views

Generating an equation from an image I have

I am not exactly sure if this question belongs here but I could not think of a better place to ask. So I recently discovered that various people on the internet have created equations for rather ...
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30 views

Programming language for function analysis

what would you suggest as a programming language for working with functions and graphs. I need them to work with complex piecewise functions. P.S it is okay, if you suggest any software.
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0answers
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How to solve a semilinear PDE numerically using COMSOL MULTIPHYSICS

I want to solve a semilinear parabolic PDE given by, $u(T,x)=0$, while on $(t,x)\in[0,T)\times(0,1)$, \begin{eqnarray} \frac{\partial u}{\partial t} +a(x)\frac{\partial^2u}{\partial ...