0
votes
1answer
123 views

How do I use a while-loop to find the gain of a transfer function's limit?

At the moment I can find the limit of my transfer function as follows: (5 4001.6`)/(5 4001.6` + (4 + s) (200 + s)) /. s -> 0 This works as I would expect and ...
2
votes
0answers
279 views

Understanding “IntensityData” coordinates

Update - Playing around a bit, is it true that we need to process the list of "IntensityData" values $r$ as follows: r = Partition[r,k]; r = Transpose@r; And ...
2
votes
1answer
182 views

Hide both input cell and output cell

You can double-click the right gutter of a input cell to hide a corresponding output cell or double-click the gutter of the output cell to hide the input cell. I would like to hide both the input and ...
7
votes
1answer
430 views

Why does Simplify with TimeConstraint return Removed[$$Failure]?

Bug introduced in 7.0 or earlier and fixed in 10.0.0 I have a rather ugly Mathematica expression (edit: shown below) that I would like to simplify with a time constraint; simplifying without a time ...
15
votes
4answers
1k views

Measure perimeter of black edge in Mathematica

I have a pattern like the one below. How could I measure the total length of the perimeter of the black/white edge? This would give me a measure of spatial frequency. Any tips would be great! Thanks! ...
2
votes
2answers
5k views

Step-by-step definite integration

I am interested in obtaining the intermediate steps for rather straightforward symbolic definite integrations (e.g., from an elementary calculus text). As an example, for $\int_0^1 x\,dx$ I'd like ...
3
votes
2answers
273 views

Export in Manipulate, infinite loop

I want to make export of a plot inside Manipulate, but only once. However, this code runs infinitely and does export infinitely: ...
1
vote
3answers
2k views

Mathematica 8: ContourPlot finding out max and min function values [duplicate]

I have a ContourPlot where I have let Mathematica draw the contours automatically. I would like to extract the zmax and zmin contour values that have been determined internally so that I can pass them ...
1
vote
0answers
96 views

Insert a Quantity Unit literal in TraditionalForm

Is there a keyboard shortcut for creating something like the result of this: Quantity["Kilograms" * ("Meters")^2 / ("Seconds")^2] After copying the result to a ...
3
votes
2answers
535 views

Ploting a 3D vector field using Manipulate, VectorPlot3D and NDSolve

My aim is to plot a vector field of the following system with a few trajectories: $$r'(t)=i-l.r(t)-\text{ux}. r(t). x(t)-\text{uy}. r(t). y(t) \\ x'(t)=\text{ex}. \text{ux}. r(t). x(t)-\text{mx}. ...
18
votes
1answer
560 views

How can I make a notebook with two column layout?

How can I make a notebook with two column layout? Is it possible? I saw something tools could do such thing? Author Tools?
1
vote
2answers
152 views

How can I make notebook cell's background become transparent?

How can I make notebook cell's background become transparent? And can be saved as html with the translucent or transparent effect? One of the use is in HTML files, the background of cell hides the ...
2
votes
4answers
227 views

Find time since last 0 in list

When I have a list of data (measured per day), is it possible to define a function that gives the nr of days since the data has been 0? I tried working with...
2
votes
1answer
517 views

RSquared Mathematica Excel incoherence

I've done a NonLinearRegression with this data ...
1
vote
1answer
249 views

RevolutionPlot3D: revolving around a line NOT an axis [duplicate]

Is it possible to revolve a function around a line instead of an axis? For instance I would like to revolve the quadratic function: f[x_]:=-0.45(x-1.5)^2 ...
9
votes
2answers
305 views

Complement on pre-sorted lists

Is there any way to instruct Complement to skip the sorting part? If the answer is no (likely), the next question would be: how can I remove from a sorted list ...
2
votes
1answer
166 views

Understanding the computation of IntensityCentroid?

If I have an image img, and I ask ComponentMeasurements to return "IntensityValues" for the ...
4
votes
0answers
405 views

NDSolve: ProcessEquations and Reinitialize with Piecewise functions

I am having trouble with using NDSolve`Reinitialize when the system consists of a pieceise function. If we define the ODE system ...
35
votes
2answers
2k views

when is f@g not the same as f[g]?

I have always thought that f@g will give the same result as f[g] in all cases, and it is just a matter of style which one to use ...
2
votes
1answer
810 views

Why cant I open CDF's in the Chrome browser on Linux?

I have google chrome on ubuntu 13.04. Every time I try to run a CDF on wolframs website, I'm required to download the CDF first, and then open it in my computer, but when I was using windows it was ...
0
votes
1answer
212 views
4
votes
1answer
727 views

How can I save the current evaluation state of a notebook and start from it later?

I currently have a nested Table command running (in Mathematica 9), with two progress bars to track the variables. I have to shut down or hibernate the computer in ...
1
vote
2answers
975 views

Manipulating Frame labels when legends are also there

I am plotting a few curves inside a frame with labels on three of its sides; left, right and bottom. I want legends to be places at the top. The problem which I am facing is that the top label ...
3
votes
1answer
189 views

Key Mapping in Command Line Mode

I would like to map Ctrl-U to "kill line" when using Mathematica 9.0 in command line mode (i.e. not within the front end, but when called from a Unix command line by "math"). I am aware that (on a ...
21
votes
4answers
874 views

“Unflattening” a list

Imagine we have a list with some hierarchical structure: list = {{{2,3},{2,4}},{{{3,4}}},{{5,6},{7,8}}}; Which we then flatten to some level in order to process ...
3
votes
3answers
394 views

ArrayPlot and non-integer PlotRange

There seems to weird bug regarding non-integer PlotRange in ArrayPlot. For example... ...
1
vote
1answer
1k views

3D Phase Portrait with direction fields and sample solution curves [duplicate]

I have seen NDSolve and ParamtericPlot3D used for things like the Lorenz Attractor, but was wondering if there is a way to draw a 3D phase portrait for a system. Something akin to this: ...
2
votes
2answers
61 views

Get the unevaluated expression from a numbered cell

If a cell exists as below: In[1] := (xyPoints = {{1,2},{2,5},{3,10}}; ListLinePlot[xyPoints]) Is it possible to get at the expression rather than the plot shown ...
0
votes
1answer
281 views

A problem on generating convex hull

For example, I typed the following: ...
5
votes
1answer
894 views

Parallelize plotting

I'm using Mathematica to make a few 3d plots. For the sake of generality, let's say they are unrelated to each other (so I can't imagine making a table out of them). However, the machine I'm using has ...
10
votes
3answers
1k views

Combining Cos[ ] terms

A function that is the sum of two Cosine terms of the same frequency x[t_] := a1 Cos[w0 t + b1] + a2 Cos[w0 t + b2]; can be simplified to a single ...
4
votes
1answer
262 views

Strange behavior on very large numbers

I want to test the value of a differential equation by replacing a solution and setting random values for r and z variables: ...
0
votes
0answers
41 views

NonLinearModelFit not generating a model without the use of “BestFit”, not sure why [duplicate]

This is my first time using NonLinearModelFit and I have run into an issue that I can't find an explanation for. The fitted model contains a ...
3
votes
8answers
255 views

How Do I Perform Simple Operations On The Elements of a Table?

I have been using the function HistogramList to generate frequency tables off a data set. The code looks like this: ...
2
votes
2answers
94 views

How to interpret and show an input number with the amount of significant digits given?

what can I do to have Mathematica intepret and show a number with exactly the amount of digits I gave as an input? I have a larger talbe with numbers (text file, whitespace seperated) which are ...
9
votes
6answers
766 views

How to set precision and format labeled Slider in Manipulate?

For my calculations, I need increased precision of parameter 'k' in my Manipulate: ...
9
votes
5answers
495 views

Count consecutive occurrences in a list above a certain value

I am trying to tally and sort the number of consecutive occurrences in a list above a certain value. For instance: ...
1
vote
1answer
220 views

Create continuous function from list

I have a list of data (measured per day) that I want to use as imput for another equation (say f). The problem is that the input I need for f needs to be a continuous function of time. Is it possible ...
3
votes
2answers
133 views

Moving a locator based on the movement of another

My problem is: I want two Locators to simulate a vector in the following sense: The first Locator is the base and the second ...
28
votes
0answers
332 views

Managing Stack Exchange favorites via Documentation Center

My Stack Exchange favorites are getting bigger and bigger. It is becoming unmanageable and is getting hard to find what I look for. A related question is Sort favorite questions. Is it possible to ...
2
votes
1answer
556 views

Legends for multiple curves

Dear users I am a new member here and I would like to ask a question about PlotLegends. I have multiple curves and want to make their legends bit more visible. ...
2
votes
1answer
111 views

Set a path relative to $UserBaseDirectory in the option inspector

Is there a way to set a setting in the option inspector to a path that is relative to some global Mathematica variable? I'm trying to set up a default stylesheet by setting ...
2
votes
2answers
878 views

How to generate a random matrix with specific parameters?

I want to use Mathematica to generate a random matrix with given dimensions, entries coming from a finite set, and with a determinant also coming from a finite set. (It's very important that the ...
20
votes
7answers
840 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 ...
1
vote
1answer
54 views
0
votes
0answers
147 views

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 ...
32
votes
2answers
824 views

eigenvector bug?

Bug introduced in 7.0.1 or earlier and fixed in 10.0.0 I have a fairly simple $3\times3$ complex matrix, $$ M=\left( \begin{array}{ccc} \frac{7}{2}-\frac{i}{2} & -1+i & \frac{1}{2}+\frac{5 ...
2
votes
2answers
294 views

Writing a function that returns a (usable) function

I am trying to create a function that returns Arnold's Cat Map of size n iterated k times. I can get something out of the Function command, but I can't figure out ...
18
votes
1answer
423 views

Underlying Algorithms for List Manipulation Functions

Does anyone know, or know of a link for the underlying algorithms used for list manipulation functions? Specifically: Union with and without the ...
2
votes
1answer
273 views

How to select TransformationFunctions based on Assumptions made when using Simplify?

I am re-writing the question using a very simple example so not to confuse matters with the another question being asked where I used the example from there. In general, how to add logic to switch ...

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