# All Questions

827 views

### Make a huge vector in a wise way

I need to construct a vector similar to: v[x_]:={0, 0, x, 0, 0, 2*x, 0, 0, 3*x, ....., 0, 0, n*x}; where n=10^9. How can I ...
53 views

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### Some questions about Integral Equation

I am trying to solve the finite Hilbert transformation like the following form $f(x)= \frac{1}{π} \int_{-1}^{1} \frac{g(y)}{(y-x)}dy$ the given function f(x)=1 and I want to solve the g(x) I know ...
563 views

308 views

### converting between forms - symbols/subscripts - matrix products

If I have a vector of the form (xp+y, x+yp) do you have a simple way of creating the following matrix and vector from it: {{p, 1}, {1, p}} * {x, y}, such that ...
164 views

### Looking for feedback on this function

I'm not sure this is an appropriate question; if not, I'm sure someone will close it :) I've got the following function, listed below; its job is to accept a graph (function) presented either as a ...
2k views

### Automatic e-mail/text message when a calculation has finished?

Sometimes Mathematica takes quite a while to finish calculations and it would be convenient to be able to move away from the computer while it is working. I was wondering if there is any "clever" hack ...
606 views

### Manipulate showing the trajectory of a particle along a parametric curve

I have a particle which follows a certain trajectory given by rx and ry ...
446 views

### Extracting matrix rows when one of its elements is part of a list (without a loop)

I have a matrix whose rows I want to extract based on whether the elements of one of its columns is a member of another vector (calling it the "comparison vector"). I would like to get better at ...
197 views

### Pattern matching on Orderless functions inside Hold

MatchQ[Hold[1 + 2], Hold[2 + 1]] returns False. But in the presence of a Blank[] in the ...
224 views

My code is ...