# All Questions

35 views

### Expand an expression to only built in functions

This question is hard to phrase and even harder to google. Maybe it's best to explain it with a very simple example. ...
27 views

### Recurrence evaluation at specific index

I have the following set of equations. I want to solve a[n] and f[n] for the indices n=1:5. Note that the relation a[2n+2] involves the derivative of f[2n] and the relation for f[2n+2] involves the ...
52 views

### Divergence in the initial value problem solved by Ndsolve

here is to ODE I need to solve: ...
59 views

### Find permutations with constraints without using Permutations

EDIT: To clarify, the bottleneck right now is available RAM, so any answer should keep that in mind (I cannot store all T! lists of length ...
86 views

### Finding solutions at non-differentiable points of a numerical function

Let's consider a 2D function we can evaluate numerically, but which is opaque to symbolic manipulation (this is just an example): ...
24 views

### Successive addition or deletion of vertices (or edges) in graph

I am trying to perform a kind of dynamic graph simulation where vertices and edges of graph are added and deleted according to the current state of the graph at each time step. I know that there are ...
21 views

### PolynomialMod: Unexpected results

Executing PolynomialMod[(X - 1) (X^3 + 2) (X^2 + 1), 2 - 2 X] 0 But ...
36 views

### CloudDeploy[FormFunction[ ]] not working

What is wrong with this code: ...
23 views

### GeoLabels/Tooltips in Geographic Plots from Dataset

I am looking to plot a list of list of regions, and attach some data to the GeoLabel. All the data is stored right now in a Dataset that contains entries of the form ...
65 views

### Question about ReplaceAll usage [on hold]

I have the following code from the answer of the question (How to impose normalization condition (not initial condition) on DSolve or NDSolve?): ...
81 views

### How can I define or use a new coordinate system in Mathematica?

I want to use the dipole coordinate system as defined in this paper: http://arxiv.org/abs/physics/0606044 I see that Mathematica can do all kinds of vector analysis using different kinds of ...
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150 views

### Prevent Export from overwriting files

Export["filepath1",Expression1] works for me, but if filepath1 already exists, it will be overwritten. I'd like ...
49 views

### Fourier Transform on a Sound

I don't really know much above Fourier Transform , or how it's used in Mathematica but I want to know how I can find out, out of which Sin-waves a (static) sound is made of. So for example I take "G" ...
24 views

### Iterative Methods for Numerical Solution of Systems of Linear Algebraic Equations [closed]

i want to learn about Iterative Methods for Numerical Solution of Systems of Linear Algebraic Equations. Can you tell me what methods fall into this area? (Jacobiho, Gauss-Seidel, SOR etc........... ...
29 views

### Simple Sin plot generates unexpected output? [duplicate]

I an trying to do a very simple smooth Sin wave... Plot[Sin[ 2 Pi 440 t], {t, 0.0, 0.1}] ...but I am getting an unexpectedly non-smooth plot for it... What is ...
I am trying to calculate n-fold convolution of a function as $G^{*n}(x)$ where $G(x)=1-a*exp(-b)+b*ln(b)$. I tried this function, Convolve[G[x], G[x]^{n - 1}, x, x] but it didn't give any answer. ...