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Questions tagged [homework]

Homework questions are welcome, as long as they are asked honestly, explain the problem, and show sufficient effort. Please do not use this as the only tag for a question. Please do not add this tag to questions by other people unless they explicitly say that their question is part of their homework.

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33 votes
4 answers
27k views

Finding unit tangent, normal, and binormal vectors for a given r(t)

For my Calc III class, I need to find $T(t), N(t)$, and $B(t)$ for $t=1, 2$, and $-1$, given $r(t)=\{t,t^2,t^3\}$. I've got Mathematica, but I've never used it before and I'm not sure how to coerce ...
a98's user avatar
  • 433
14 votes
8 answers
5k views

How to make a resizable chess board?

For some reason I need to create a chess board. I can create a chess board by following command: ...
forumcash's user avatar
  • 557
9 votes
2 answers
613 views

Check homework integration in Mathematica

Given in my homework I have to compute (by hand) $$\iint\limits_{x^2+y^2\leq 1}(x^2+y^2)\,\mathrm dx\,\,\mathrm dy.$$ My solution so far: Let $f(x,y)=x^2+y^2$ and $K=\{(x,y)\in\mathbb{R}^2:x^2+y^2\leq ...
Christian Ivicevic's user avatar
9 votes
3 answers
11k views

I want to draw a graph using a weighted Adjacency matrix

I have a weighted adjacency matrix as follows: ...
Ryan Durrant's user avatar
8 votes
4 answers
1k views

Generating a polynomial that's accurate to within an error of no more than 1/10^5

I'm currently stuck on a question for class that asks... "Find a polynomial p[x] that you can use to calculate 6 ArcTan[x] to ...
user19060's user avatar
6 votes
4 answers
12k views

The Lotka-Volterra predator-prey model

I have a Mathematica assignment where we need to numerically solve a Lotka-Volterra predator-prey population equations. $$\frac{dx}{dt}=ax-bxy,\quad\frac{dy}{dt}=-cx+dxy,$$ where $a,b,c,d\in\mathbb{R}...
elykl33t's user avatar
  • 173
6 votes
1 answer
576 views

An efficient way to translate a triple for-loop from Matlab to Mathematica

This is my first post on StackExchange, so if I violate any etiquettes, I apologize in advance. I am a senior engineering student who has been using Mathematica for a year now. For one of my classes, ...
H. Alanzi's user avatar
6 votes
3 answers
527 views

Particle moving on curve which is the intersection of a surface and a plane

Surface z = 2 x^3 - 5 y^4 Plane z = x + y + 5 Plot A curve is formed by the intersection of the surface and the plane. I ...
TonBar's user avatar
  • 63
6 votes
1 answer
139 views

NumericQ exercise in Wagner

I've been thinking about this exercise in Wagner (p. 269), but I can't answer. Can you tell me?
BoLe's user avatar
  • 5,879
5 votes
4 answers
525 views

Using the Tube function to create a torus from an equation for the curve

I've been searching for an answer for this for a while now, but I can't find anything that deals with using the Tube function to generate a torus from the equation of the torus. The equation of my ...
TubularHell's user avatar
5 votes
1 answer
332 views

How to plot trajectories of the Rossler System [duplicate]

This is my current homework problem. I have completed parts a and b, but am now stuck on part c. I'm not sure what it means by plot the trajectories with different initial conditions, nor am I 100% ...
Sarah Johnson's user avatar
5 votes
2 answers
180 views

How to find each internal angles of an n-sided irregular polygon

The vectors given in problem are: p1 = {1, 2, 2}; p2 = {3, 1, 1/4}; p3 = {2, 3, 9/4}; p4 = {5, 2, 0}; p5 = {3/2, 5/4, 19/16}; Find all 5 of the (internal) ...
MJY's user avatar
  • 51
5 votes
1 answer
390 views

PearsonChiSquareTest: set degrees of freedom

How to set degrees of freedom for PearsonChiSquareTest? I have this: ...
Medvedev's user avatar
  • 153
5 votes
1 answer
3k views

How to plot the solution of a Partial Differential Equation?

My attempt. I need to solve numerically the Complex Ginzburg-Laudau Equation (CGLE): $$ \frac{\partial A}{\partial t}=\epsilon A-(1+i\beta)|A|^2A+(1+i\alpha)\nabla^2A $$ I'm using a uniform initial ...
Ana S. H.'s user avatar
  • 433
4 votes
3 answers
578 views

Area of volume of revolution

I want to calculate the exact area of this volume: RevolutionPlot3D[ f[x_] = Sqrt[28 x] , {x, 0, 21} , Axes -> True ] Additionally, I wish to see $x$ and $...
Dovendyr's user avatar
  • 225
4 votes
2 answers
560 views

Euler-method implementation

How can I implement this pseudocode in Mathematica? Algorithm: ...
Birgitt's user avatar
  • 267
4 votes
2 answers
385 views

How to check whether Laguerre polynomials are orthogonal?

I've got the problem with checking if Laguerre polynomials for n=1,...,10 are orthogonal. I have to create the list of these polynomials, then create the matrix of integrals from 0 to infinity. ...
Crunchy's user avatar
  • 41
4 votes
2 answers
287 views

Use Select to filter a dataset's sublists

In the following Dataset, I want to use Select to display only rows, which contain numbers in column ...
Fox's user avatar
  • 127
4 votes
2 answers
598 views

Strange determinant result

I carried out the determinant of a $4\times4$ matrix in two different ways: with Laplace and without Laplace (see this attachment please). The Laplace's rule is applied "manually" in Mathematica (I ...
Gennaro Arguzzi's user avatar
4 votes
3 answers
605 views

Dot products and For-loops

I'm taking a class where we're working with matrix applications inside of Mathematica. In this case, we're analyzing senatorial votes that have been numericized so that a value of 1 corresponds to "...
H. S.'s user avatar
  • 51
4 votes
1 answer
273 views

Illustrating the central limit theorem

I'm working on this question is from Wolfram Mathematica online course. I tried my best to find the answer, still not getting it right The question is: Make a list of histograms of 10000 instances of ...
Ratheesh's user avatar
  • 327
4 votes
1 answer
599 views

How can I make a pretzel shape using Bézier curves?

I am trying to make a pretzel shape,but I cannot seem to get the loops even. Eventually, I need to make the pretzel shape loop in 3D so I need to nail the 2D concept first. Here's what I have so far....
Johnny's user avatar
  • 141
4 votes
2 answers
216 views

How to find $\delta$ for limit type questions

...
Goldy's user avatar
  • 245
4 votes
3 answers
645 views

Minimizing Multiple Functions

I'm trying to write a script that will minimize a given set of functions. The homework problem I've been given lists a set of dietary information, and I'm supposed to build the optimal salad based on ...
Jacobm001's user avatar
  • 143
4 votes
1 answer
136 views

How can I create a randomHop function that would return certain coordinates? [closed]

I've tried to create a function that's equal to a loop containing 4 if functions, one for each integer, but the result would not show the desired outcome. How can I go about doing this question? Write ...
jbl's user avatar
  • 357
4 votes
1 answer
303 views

Tower of Hanoi list of disks on the rods

I'm currently trying to finish a program that outputs the "radius" of each disk on each rod in lists. I currently wrote this program: ...
user52616's user avatar
  • 105
4 votes
1 answer
109 views

Dynamics problem [closed]

This is school work. I do not want the problem solved for me, but I just want to know what I did wrong with my ParametricPlot. Question: A material point moves ...
user avatar
4 votes
2 answers
362 views

Numbers to binary and back

I am struggling on how to create a function that converts a number into binary and then back. I know there is a built-in function about this BaseForm[] but I am ...
peter21's user avatar
  • 61
4 votes
1 answer
105 views

how to make my own `PrimeQ` function?

How can I create my own function that verifies if the number is a Prime without using PrimeQ ...
shakeel's user avatar
  • 41
4 votes
1 answer
226 views

Extraction of rows with even numbers of a dataset

...
Ok_one's user avatar
  • 41
4 votes
0 answers
110 views

Plotting gradient and newton directions for parametric system of nonlinear ODEs

I have a bucket (system) of chemical kinetics models, a nonlinear dynamical system given by: where kf >= 0 and kr >= 0 are the parameters. The initial conditions are A(0) = B(0) = 1 and C(0) = 0. I'...
Sterling's user avatar
  • 553
3 votes
2 answers
642 views

Plotting the solutions of $y' = -\frac{\cos y}{\sin x}$

I struggle with the problem of plotting the solution of this ODE: $\qquad y' = -\frac{\cos y}{\sin x}$ I've already tried to use ContourPlot in a loop and in a ...
RuD_wow's user avatar
  • 31
3 votes
2 answers
3k views

For Loop and Sum

I am requested to do a sum of the first fifty positive even numbers by using For loop. The For loop that I created is ...
Laura Figueroa's user avatar
3 votes
2 answers
4k views

Using the epsilon tensor in Mathematica

I'm having a great deal of trouble getting started on a weekly homework assignment in Mathematica. The assignment requires we use the epsilon tensor which is apparently built into Mathematica as ...
Merry's user avatar
  • 85
3 votes
3 answers
756 views

For Loop to Sum numbers in a list

I'm asked to create a For[] loop that will sum positive numbers in a list. I am unsure of how to do this. ...
user72663's user avatar
3 votes
2 answers
285 views

Exercise using Sort

I have to order the following list according to the sum of the powers of each element of the list, using the function Sort. ...
hrmello's user avatar
  • 117
3 votes
4 answers
550 views

Print all numbers from a sequence which don't contain the digit 7

so i have this: Cases[RecurrenceTable[{a[n + 1] == 7 a[n] + n, a[1] == 1}, a, {n, 7}], Except[7]] But i noticed that it will only exclude numbers that are 7, and ...
lara's user avatar
  • 39
3 votes
3 answers
341 views

Infinite While loop

I have an exercise where I need to input a multi-digit number and evaluate the square of the sum of its digits. I am new to Mathematica and I can't figure out why I'm getting an infinite loop. This is ...
D. D.'s user avatar
  • 33
3 votes
1 answer
654 views

How do I plot a Laplace transform?

I have been looking everywhere for help on this issue and cannot find a solution that works. Here is the assignment. I have figured out how to find the Laplace transform, but I do not know how to ...
Stephanie Green's user avatar
3 votes
4 answers
457 views

Implicitly defined curve

Consider the curve $C$ defined by the equation $y\, \sin(x)+x\, \sin(y)+x+y=0$. Find all points of the form $(8,y)$ that lie on $C$. For each point found in part 1, evaluate the derivative $dy/dx$...
mastud89's user avatar
  • 319
3 votes
1 answer
702 views

Adams-Bashforth method implementation code review

I have a program for Adams-Bashforth method and I want to do some tries to see if it's working properly but I don't know how to do it. My code for AdamsBashforth is ...
John hall's user avatar
3 votes
3 answers
359 views

Get a triangle’s angles from the sides

Hint: For the SSS case, you are given the 3 sides a, b, and c, and need to find the corresponding angles α, β, and γ. To find α, for example, you solve the equation ...
Michelle's user avatar
3 votes
2 answers
602 views

Tensor contraction

How do I let mathematica compute a tensor contraction like $\delta_{ab}\delta_{bc}$ with an output $\delta_{ac}$ efficiently? I tried TensorContract and TensorReduce but they were not helpful. ...
Hamurabi's user avatar
  • 199
3 votes
1 answer
2k views

Analyze stability of equilibria using Routh-Hurwitz conditions

For an assignment, I need to analyze the stability of a system very close to equilibrium, using "Routh-Hurwitz conditions". I have already obtained the characteristic equation of my system, but I do ...
Matton968's user avatar
3 votes
1 answer
313 views

Using single replacement rule to convert algebraic expression

I have been trying this problems for hours and cannot find any helpful clues. How can I convert $Sinh[3\theta]+Sinh[\theta]$ to a rational function of x given $2Sinh[\theta] = x-x^{-1}$ by using only ...
user71346's user avatar
  • 395
3 votes
2 answers
220 views

Using Map to extract elements of a list

I am given this problem. ...
12345's user avatar
  • 199
3 votes
2 answers
115 views

Finding the consecutive distance of n-dimensional points with Mathematica

I want to create a list of (n-dimension, average of points) with 10,000 points per n-dimension. I can't figure out how to take the distance of consecutive points. Say in 2-dimensions, there are 3 ...
mmfranco's user avatar
3 votes
1 answer
322 views

Formatting ANOVA table and/or ParameterTable without using Grid?

Does anyone know if there is an option or function that can automatically format the output of ANOVATable and ParameterTable, ...
johnwick0405's user avatar
3 votes
1 answer
127 views

UnitStep in Mathematica when t varies differently

How can I use the UnitStep command when I have a piecewise function $f(t)$, where $f(t)= 0$, when $|t|>4$, and $f(t)=1$, when $|t|<4$? I tried with ...
Maria Bonatto's user avatar
3 votes
1 answer
742 views

Newton's Method

Problem statement: I'm currently new to Mathematica and have been trying to solve this problem. I was digging around and found this code: ...
JVang10's user avatar
  • 31

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