# All Questions

183 views

### How to solve this equation? [closed]

The numbers real x and y, are solutions of the following equation system : $$\{x^3 + 3x^2y + 3xy^2 + y^3 2\sqrt2$$ $$\{x^3 - 3x^2 + 3xy^2 -2y^3=0$$ . $$x^2 + y^2$$ How to solve it ?
285 views

### permutation as product of transpositions

How can the permutation that takes{-f, -i, i, -e} into {-e, -i, i, -f} be realised as a sequence of nearest neighbour ...
187 views

### How to create a list of variable names to some function of that variable

For example, for a single variable I can write Print[Unevaluated[a], "=", f[a]] But if I try the next thing I'd think of doing, assuming I want a list, it ...
213 views

224 views

### Context Sensitive Formatting for a Table

Suppose I am calculating the correlation of a a set of vectors. Correlation[RandomReal[1, {5,5}]] I would like to display the output using TableForm or Grid ...
279 views

### FindMinimum, NMinimize, etc. with external process

I was hoping to be able to use MMA's minimization power to work with an external process. I want to minimize the function 'TryThisNumber[x_]' which sends the value of x to something external and gets ...
425 views

### Plotting Complex Roots of Unity [duplicate]

Possible Duplicate: Finding real roots of negative numbers (for example, $\sqrt$3${-8}$) I am trying to make Mathematica plot the cube roots of $27i$ and graph them, so that I can include ...
374 views

### Rotated text in “plot” cannot be copied to MS Word

When I add some text to a simple plot with drawing tools, the text cannot be copied and pasted out with the graphic itself to Microsoft Word. Do you know how to copy the manually added text out to ...
236 views

### Replace values of a list containing words and numbers

I'm trying to import some data in a .txt file which contains numbers and words. I import a list which consists of four rows of measured data acquired with an oscilloscope, but the acquisition program ...
485 views

### Use Mathematica to do a network analysis of Mathematica.SE

Recently Wolfram|Alpha announced that you could use it to analyze your Facebook site. How could I do a network analysis of questioners and answers here on Mathematica.SE?
151 views

### How do I fix Needs[“OpenCLLink”] failure?

In Mathematica 8.0.4 under Mac OS X 10.8.2, when I evaluate Needs["OpenCLLink"] I get error ...
527 views

### Why does repeating an equation help in FindRoot?

I'm trying to understand this behavior of FindRoot. Consider a sample function (the one I'm actually interested in is far more complicated, but has similar issues) ...
778 views

### How to process .vtk file

I want to extract the cluster of points inside 3D box, is there any way one can do this in Mathematica?
344 views

### Change number from real to integer [duplicate]

Possible Duplicate: Is this the most efficient way to round approximate integers to integers while leaving other Reals untouched? Please consider the following: ...
221 views

### How to get state of checkbox?

Please explain how to get state of checkbox for its usage in further calculations. And I want to keep the selection from session to session without external savings. Thanks in advance
434 views

### For[] or While[] can't be used inside Manipulate[]?

Here is a code sample that creates a control object which calculates the expressions inside Maniplate again and again and never stop (it's proved by the code in the ...
298 views

### Argmax in a List

I have a sequence of 100 lists. A sample list, list[1], looks like this: ...
610 views

### Finding eigenvalues of a $1500\times1500$ matrix

I need to find the eigenvalues of a $1500\times1500$ real symmetric matrix given by $A_{i,i+1}= A_{i+1,i}=-1$ and also $A_{1,N=1500}=-1$ (this is because of a periodic boundary condition used) and all ...
184 views

### How to style and position VerticalCallouts and RadialCallouts

Here is a pie chart with a labels placed with a "VerticalCallout" ...
529 views

### How to measure segment length and branch angle

I am trying to measure segment length and branch angle or bifurcation angle between each pair of segments. My image after thinning looks like this: ...
152 views

### Using Plot3D with one variable dependent on the other

Plot3D[f,{x,xmin,xmax},{y,ymin,ymax}] In the above , is there any way to give range of y in terms of x. I want to give like ...
230 views

### Solve for $a$ as a function of $\beta$?

I am trying to solve this equation: $$\beta^{-a} \Gamma(a) \sin(a \pi) + e^\beta \beta^{2 a - 1} \Gamma(1 - a) \sin(a \pi) = 0$$ I tried the following: ...
98 views

### Subvalue and level

I'm interested in the arguments of f in expressions like f[a]@f[b]@f[c] By argument I mean what is here ...
303 views

### Solving antisymmetric tensorial equation

Assume we have the following Tensor objects: $$F_{i}{}^{j}\;and\;S_{ij}{}^{k},$$ where the components of $F$ are known, and we would like to solve for the components of $S$ ...
173 views

### TimeConstrained[] not taking full amount of time

I am using Mathematica to evaluate an integral within a given time constraint. Note that I have read in values of 'BigList' or BL from a file. If the file has a ...
997 views

### 2D Gaussian distribution of squares coordinates

I would like to imitate the structure of this great painting from Ellsworth Kelly in Mathematica. Yet with all the colored squares in Black and the beige one in white. Below is what I have wrote to ...
218 views

### Resolving reduced resolution issues in WSMLink

I have been attempting to evaluate Wolfram System Modeler (WSM) and it has not been going smoothly. It looks like some of the Modelica Models (combiTable1D for instance) supplied are not complete or ...
138 views

### How could I obtain real numbers for the following integration instead of imaginary ones?

As shown in the following codes, ...
111 views

### Why does mathematica crash when I rotate a 3D graph? [duplicate]

Possible Duplicate: SIGSEGV error with 3D Plots I just recently installed mathematica 8 on my linux machine, running ubuntu 11.10 I decided to tun and test mathematica so while the terminal ...
165 views

### how do you fix an axis in place for a movie?

I have a series of txyz coordinates, which I am plotting in space to create a movie of the objects' time evolution. With something along the lines of (simplified): ...
161 views

### How do I convert an argument list to a list of arguments? [closed]

I think this is a basic question, but I am having difficulty finding the answer in the documentation. Thread is not what I am looking for, I think. Suppose that I ...
10k views

### 1 Plot, 2 Scale/Axis

I would like to plot those two datasets on top of each other. But they have very different range on the $y$ axis. How can I have two different axis? I found the following on the help menu but quite ...
182 views

### How to find maximum ConditionalExpression among all solutions

For example I want to find solution with maximum value among solutions (and possibly plot it): ...
101 views

### Changing the contents of a TextCell according to the user input of another TextCell

Is it possible to change TextCells in the following code in that way, that the TextCell "profile starts at x =" changes to "profile starts at y =" and at the same time the TextCell "measurement starts ...
222 views

### Can palettes dock to notebooks?

Over on Meta: A wishlist for Mathematica I got an interesting comment on the following suggestion and thought it merited a stand alone question: re: NOTEBOOK INTERFACE USABILITY & ...
281 views

### ReplaceAll[] and Limit[] don't give correct results for this expression under extreme variables [duplicate]

Possible Duplicate: Funny behaviour when plotting a polynomial of high degree and large coefficients 1/x^2 + (3 + x)/(6 (1 - Exp[x] + x)) ——This is a ...
299 views

### Using Functions as Arguments to Function

I am trying to make a function like Norm but defined like so: MyNorm[{x_,y_,z_}]=Sqrt[x^2+y^2+z^2]. Mathematica assumes that x, ...
357 views

### Degree Symbol missing in PolarPlot when exported to PDF

I am trying to produce a polar plot. The axis should be in degrees. While no error occurs, the pdf export isn't working properly. Instead of the degree symbol I get ...
245 views

### Conditionally replace rows in lists

I have a sequence of matrices/lists ...
146 views

### Is there a good way to map a function over a list to lists exclusively of a certain depth?

Let's say I have some ragged list. If some elements have some depth $n$, then is there a way I can map a function to only those elements? I.e., for some list foo, ...
388 views

### Problems with FindMinimum for Constrained Optimization

I am trying to define a simple optimization problem, arising from the discretization of a simple Optimal Control problem. The problem that results is essentially linear, with bilinearities only ...
1k views

### Can one force a linear regression fit to go through the origin?

As the question says, can one force a fit through the origin $(0,0)$ as one can when fitting a trendline to your data in MS Excel? If so, how do you do that?
3k views

### Changing the background color of a framed plot

I frequently generate framed plots like this: Plot[Sin[x], {x, 0, 2 \[Pi]}, Frame -> True] Is there an easy way to change the background color of the framed ...
145 views

### How can I find the average of the ordinate of an indefinite number of lists of points?

Suppose that I have three lists: list1 = {{0, 1}, {0.1, 10}, {0.2, 100}}; list2 = {{0, 1}, {0.1, 10}, {0.2, 100}}; list3 = {{0, 2}, {0.1, 20}, {0.2, 200}}; In ...
463 views

### Ordering vertices in GraphPlot

I'm new here, so forgive me if this question is not well-posed/duplicates an earlier question - although I've searched for similar questions without success. I'm trying to present a plot of ...
786 views

### Set default font for Output

Is it possible to set the font family to Arial for axes, legends and labels globally? I found out about ...
159 views

### DateList Segmentation of data

I've been trying to separate large segments of DateList formatted data (years worth at a time) into individual days using the Split function. The data has the form: ...