# 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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### 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 ...
3k 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 ...
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: ...
605 views

1k views

### Using triangulation

I have been presented with 3 known points and the power densities at those points. I need to use those points to find the location of the actual antenna which is generating the signals. Power ...
290 views

### Recreate specific plot in Mathematica

Can anyone help on this ? I did this ...
1 vote
314 views

### Using a numerical solver to solve a system of ODEs [closed]

Consider the competition model defined by dx/dt = x (2 − 0.4 x − 0.3 y) dy/dt = y (1 − 0.1 y − 0.3 x) Where the population x(t) and y(t) are measured in the thousands and t in years. Use a numerical ...
11k views

### I want to draw a graph using a weighted Adjacency matrix

I have a weighted adjacency matrix as follows: ...
172 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) ...
575 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....
353 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. ...
566 views

537 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}, a, {n, 7}], Except] But i noticed that it will only exclude numbers that are 7, and ...
2k views

### draw part of parabola using graphics

Today, I was doing my physics homework. One of the questions was to draw velocity-time and position-time graphs from the acceleration-time graph. So for the first step I draw acceleration-time using <...
552 views

### How can I use Histogram and Histogram3D on an image?

I have a .jpg image named r. I am using the following code to plot a histogram: ...
1k views

### How can I fix my Simpson's rule integration code?

I was tasked with writing a function on Mathematica similar to NIntegrate, but that uses the Composite Simpson's Rule as its method for doing the calculation. The ...
438 views

### local variable naming & symbolic argument

I'm stuck here with my variable assignment in this scenario ...
123 views

### Inserting an integer into a list while maintaining descending order

Define a function g with two arguments, w and n, where w ...
1 vote
839 views

### Is there a way to select the highest exponent of a polynomial expression?

I have a problem to program a particular kind of expression: Sum[1/(k n) (HS[t^k,x^k])^n,{n,1,Infinity},{k,1,Infinity}] where HS[t_,x_] is a polynomial function ...
1 vote
436 views

### Calculating double integral bounded by domain in Wolfram Alpha Notebook [closed]

If I want to compute Double Integral on a given region(See attached Picture) How can I input this on Wolfram Alpha Notebook
1 vote
329 views

### Create a plane equation from a point and a line (not normal) [closed]

I have to decide the plane equation in normal form, that goes through the point (3.08,1,4.76) and the line (4.08,3.08,5.76)+ t( 3,6,-3). I have no idea how to do it. I google it and found some ...
1 vote
799 views

### Frequency of elements in a list (merging tally data) [duplicate]

I've got a list in the format of list={{a,1},{a,1},{b,1},{c,1},{b,1}} And I want it to "compress" into a list of pairs ...
1k views

### Least Square Fitting

stuck on a mathematica assignment and could really use some help. A) Fit a function with the shape log(Y) = a0 + a1log(U) to the datapoints (log(Ui), log(Yi) with an least square fitting. Show this ...
5k views

### Solving One Equation with Two Variables

I am trying to solve an equation with two variables. It is the last step in the process of using the method of undetermined coefficients to solve a nonhomogeneous differential equation. The equation ...
75 views

### Function to determine number of trees surviving forest fire [duplicate]

How can I write two functions, each of which have as their argument an array mat of 0s (no trees), 1s (trees), 2s (burning trees), that can determine the trees that survived a forest fire, which run ...
198 views

### Fraction of fibers that have failed

I have the following to set into mathematica. Assume a stress(sigma) applied on a specimen which has a number of fibers within it. All fibers that have a strength less than the applied stress should ...