# All Questions

13 views

### ButterworthFilterModel consumes the memory too much

I have a simple filter which is a result of the these questions here and here I have to use this filter in a Do loop but I found that this filter consume the ...
23 views

### Using DSolve for a nonlinear DE, list encountered error [on hold]

I'm trying to solve a nonlinear differential equation using DSolve. I type in ...
22 views

### Express the WhiteNoiseProcess in number form

I have this function However, I want to export its values so that I can plot the graph in the TecPlot May I know How to achieve that.
23 views

### DateListPlot inside DynamicModule updates continuously

Can any one try this code and see if it is updating continuously without changing the controllers: ...
29 views

### development of probability formula of the sum of events how?

For any finite sequence of disjoint sets, $A _ {1}, A_ {2}, A_ {3}, ..., A_ {n}$, we $P(\bigcup_{i=1}^{n}{A_i})=\sum_{i=1}^{n}P({A_i})$ As I get Mathematica develop this formula to ...
74 views

### More elegant function construction for blues loop

Is there a more elegant way to do this: ...
21 views

### How to set variable initial values in NDSolve?

Currently I'm trying to make a simulation of a swing by maneuvre, in which I send a probe around the Moon. For now there is only the probe and the Moon but eventually it will be expanded. I'm doing ...
24 views

### Bourdet Derivative — indexing list elements

Used by petroleum reservoir engineers to diagnose well behavior, the Bourdet Derivative is defined as follows: Simply, it is a weighted central-difference derivative of {time, pressure} data. I ...
29 views

### NIntegrate problem with limits in triple integral [on hold]

So I am trying to solve a triple integral in mathematica, but I am getting errors regarding my limits of integration. This is my code: ...
30 views

### Function of surface roughness

How do I draw with Mathematica a function like this? I would use a series of circles and find the surface. Thanks!
20 views

### Mathematica Stops Working

When I run the following code (taken from a Mathematica Blog) which is solving the NS equations; ...
31 views

### Finding the positions DateList dates in a range in large data set

There are similar questions to this like list search but this question is focused on finding at subset of dates in DateList format within a range of specified dates ...
44 views

### Duration of each note $\pm \epsilon$

Apologies if this has been asked before, but I can't seem to find a solution. I have a little track - eg: ...
35 views

### Find all solutions which satisfy the given conditions

Let $$m=9n^3+30n^2-9n$$ where $n \in \mathbb{Q^{+}}$ and $m \in \mathbb{Z}$ . Find all solutions which satisfy the given conditions. So I've tried to solve this manually and I was ...
53 views

### Translating syntax of a pure function

I have a matrix in complex exponential form. I want to factor out the complex exponential form and then express the inside in the a+i*b form. For example: \begin{bmatrix} e^{i \frac{\pi}{4}} ...
32 views

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52 views

### Derivative of piecewise function

I tried to find $f'(0)$ of this function: $$f(x) = \begin{cases} x\cdot\sin(\frac{1}{x}) & \text{if x\ne0} \\ 0 & \text{if x=0} \end{cases}$$ This is what I tried in Mathematica: ...
37 views

### Mathematica 8 won't start - Error Code 499

I am pretty dumbfolded on this one and there seem to be virtually no clues around the net. The only thing vaguely related is a fairly similar (unsuccessful) question on reddit: ...
25 views

### How to obtain differential consequences of linear transport equation automatically?

Motivation Here I've asked how to derive coefficients of numerical approximation of the linear transport equation $$u_t + u_x = 0, \tag{1}$$ on a fixed 3-point stencil automatically and here I've ...
45 views

### Reducing the size of exported .eps files to the minimum necessary

Running version 10.3 on my Power Mac with 22 Gbytes of memory I can create and export an .eps or .pdf graphics such as, ...
140 views

### select from a list of disks

I have the following list of centers of disks. ...
46 views

### Plotting an Infinite series question [on hold]

I am trying to plot the infinite sum: $$u(x,t)=∑_{n=1}(8L^2/(2n-1)^3π^3)\sin(((2n-1)πx)/L)e^{(-(2n-1)^2π^2kt)/L^2}$$ with $L=1$, $k=1$ and $t=0.1$, $0.2$, $0.5$, $1.0$, $10.0$. This is what I have ...
66 views

### ParallelTable and Random

Each time I execute the following code it generates the same cylinders with the same format. ...
83 views

### Three Body Problem Equilateral Triangle

I'm currently working on showing that the equilateral triangle arrangement of the three-body problem has an analytic solution. So far I've written the equations of motion of each body into Mathematica ...
53 views

### Extract part of a matrix

I have imported a matrix from a .txt file (it could be better from an Excel file): ...
93 views

### Orderless and Sequence

I just ran into the following subtlety. Let us consider a function f with attribute Orderless. ...
77 views

### What is the difference between Dynamic[x] and Dynamic[ h[x] ] for DynamicModule variables?

Why plain Dynamic[x] is less sensitive and less likely to automatically be updated than e.g. Dynamic[{x}]? The issue was raised ...
34 views

### How to find x intercept using two functions in NDSolve?

I have functions for x[t] and y[t] in NDsolve and I want to find where the graph crosses the ...
146 views

### intersecting cylinders

I try to replicate the two figures of two intersecting cylinders from here. I tried ...
57 views

### ListPlot of imginary part

Assuming I have a list like: {{1, 1. - 0.0169212 I}, {2, 0.99611 + 0.0326189 I}, {3,1.02048 + 0.0945609 I}, {4, 1.02722 + 0.138977 I}} When I try now ...
52 views

### How to delete certain words from a word cloud in mathematica?

I generated word clouds from a text file in Mathematica. I was able to remove words with 5 or less characters from the cloud. ...
27 views

### Maximum Value of an Interpolating Function [on hold]

my code below does not output the correct maximum value. ...
35 views

### Y-axis Tick labels are all identical [duplicate]

For Plot[x^12 - x^9 + x^4 + 1, {x, -.001, .001}] Details on Y-axis seem to be wrong.I am using V 9.0.1.0 .Bug?
50 views

### Getting axes range from plot (of the plot) [duplicate]

Related to this question in a way. After making a plot, I'd like to get the plot range (not the range of the function, but the range chosen for plotting which usually leaves some buffer room). I've ...
32 views

### Avoiding Smoothing in ListSurfacePlot3D

I'm loading a dataset {x,y,z,v} from a text file. It is about a triangulated surface and then I am using ListSurfacePlot3D to plot it. However, ListSurfacePlot3D is ...
31 views

### For “ListPlot3D” ,How to make a color plot, if the f(x,y) range only from very small amount [on hold]

I have plotted with List3d plot using the following command ...
55 views

### Wrong root when using numerical values

I have the following inequality: $$\sqrt{\frac{a}{2x}}+ \frac{b}{1-\frac{a}{a+\sqrt{a(2bx + a)}}} + \frac{a}{2x\frac{a}{a+\sqrt{a(2bx + a)}}\left(1-\frac{a}{a+\sqrt{a(2bx + a)}}\right)} < f$$ on ...
311 views

### How to code the following in Mathematica

How do I get the following into Mathematica, solving for a: $$0.7 = 1 - \frac{2}{a} \times [ \frac{1}{a} \int_0^a \frac{x}{\exp(x)-1} dx + \frac{a}{6} - 1]$$