2
votes
0answers
88 views

Problem with files size

I need to work with long time series, but I notice that this generates huge files that Mathematica doesn't handle well at all: even opening/saving one of this files is difficult, and the kernel quits ...
0
votes
1answer
95 views

Excluding an interval of parameters from Integrate [duplicate]

I'd like to compute an integral that depends on a parameter, but I'd like to exclude an interval from the computation. For concreteness, say I want to compute ...
22
votes
6answers
6k views

Finding the intersection of a curve with an interpolation function

There are no issues trying to find the intersection points of two defined curves. ...
1
vote
2answers
169 views

Symbolic solution of system

everyone! I am sorry, but I am an abcolute novice of Mathematica (to be more precise this is my first day of using it) and even after surfing the web and all documents I am not able to solve the ...
1
vote
1answer
136 views

Use Simplify option Trig->False when 3rd argument to Collect is Simplify

I would like to simplify the following expression AAA (4 Sin[x]^2 Cos[x]^2) + AAA 4 Sin[x] Cos[x] + AAA with the ...
0
votes
2answers
119 views

Can I tell Simplify to prefer nested polynomials?

I need to export expressions for numerical evaluations in a C codebase. Simplify often does a good job for this, and polynomial factorisation goes a long way. However, occasionally I would come ...
3
votes
5answers
489 views

Minimum in a nested list [duplicate]

I have a nested list of {x,y,z} and I want to find out the values of x and y where z is minimum. I can write a nested For loop and do it ...
5
votes
1answer
119 views

Add options to upvalues

I have some objects that I want to present in TeXForm. Thus, it is easily to do as follows: YoungTableau/:TeXForm[YoungTableau[diagram_]] However, what if I ...
5
votes
3answers
229 views

Non-descending Tuples

I want to get all the non-descending tuples of a list with given length, for example: f[{1,2,3,4},{3}] ...
4
votes
2answers
524 views

specify field width in Print

I would like to format the output. For example, the following code gives ...
8
votes
1answer
499 views

How does PlotLegends actually work with ListPlot3D?

I'm sensing this might be a rookie mistake but normally I roll my own legends but decided to try the built in legends for a ListPlot3D. ...
2
votes
2answers
525 views

Replace a column in table with a list of numbers?

I have a Table of values e.g. {{x,y,z},{x,y,z},{x,y,z}…} How do I replace the the "z" column with a List of values?
2
votes
1answer
494 views

Infinite loop with While is very processor-intensive [closed]

This simple line of code: While[True, Pause[1]] uses 55% of one CPU core on my computer. Are there more efficient ways to construct simple infinite loops in ...
0
votes
0answers
45 views

Using Table[ ] vs using Do[Append [ ] ] [duplicate]

Is it generally better/faster to use the Table function over using Do[Append []]? For example, I have this piece of code: ...
7
votes
1answer
425 views

Visualize a tree structure using TreeGraph

I have a code that generates a tree of graphics objects. The structure can be visualized like this, with each Rule constituting a parent child relationship: ...
2
votes
3answers
108 views

Assigning symbolic operators to built-in functions

Can I do something like this: $$\partial_t = D[f, t]$$ i.e. create a symbol instead of a function so that each time I call it, it executes the operation as defined?
2
votes
2answers
393 views

Checking if a number is a perfect power

I wanted to know how would I use Mathematica in order to check if the number is a perfect power I saw the algorithm but couldn't grasp it enough to implement it, so can anybody help?
1
vote
0answers
227 views

Invert a transcendental function

I have tried Reduce and Solve in Mathematica, as well as have a long list of tries in Maple, but cannot seem to get anywhere ...
0
votes
0answers
231 views

How to plot an implicit equation with separate dispersion lines of Lamb waves

I'd like to plot (to try reproduce) dispersion curves of Lamb waves as in http://en.wikipedia.org/wiki/Lamb_waves But I can't to separate each lines. I was reduce the dispersion equations as X=ωd/Vs, ...
0
votes
1answer
605 views

Pass unevaluated function with evaluated arguments

I am almost sure that this question has been asked somewhere. I found similar ones, but I cannot find exactly what I need, which might mean that I am on the wrong track. I search a method to pass an ...
0
votes
0answers
119 views

Probability Model

I have the following probability model: $(X_k|\text{ PastHistory}_{k-1}, \theta_0, \theta_1, \theta_2) \sim (\pi\cdot N(\theta_1+\theta_0\cdot X_{k-1},1)+(1-\pi)\cdot N(\theta_2+\theta_0\cdot ...
2
votes
1answer
87 views

Palette to set Cell Options such as Background Editable and Initialization property?

Hello I have found examples of codes that generate palettes to format the text of a cell (or a portion of it). I have also found codes for palettes that change the style of a cell. The latter is ...
2
votes
3answers
269 views
0
votes
0answers
144 views

eigenvalues and eigenvectors without Root answers

I'd like to find eigen values and vectors of parametric 21*21 Matrix and i cant solve the root problem.please help me to find the answers without Root. My Matrix is: ...
-1
votes
1answer
183 views

ListLinePlot problem

OK, so here I got the solution of a numerically-solved PDE. I wish to plot in a graph, for a given time, the point x where the solution reaches 1/2. So here's the relevant string of code: ...
3
votes
3answers
331 views

Fastest way to check if an expression contains all symbols from a list

I need to execute this function thousands of times, and the faster, the better. I came up with two versions, but wanted to see if you can come up with an even faster way. Is there a better way? I use ...
5
votes
1answer
361 views

replace items in a list with items in a another list

Suppose I have a list A={x1,x2,x3}, a list B={3,4,5}, and a function f[x]=x1+x2+x3. Is there ...
0
votes
0answers
78 views

3d graphic for publication [duplicate]

Journals are very strict and some of them require special formats. They suggest the .tiff or .jpg format for graphics with many colors. I have problem how to export, for example, this figure consists ...
10
votes
2answers
491 views

Rearranging a List

I am trying to rearrange/sort a list i.e. {{1,2},{10,140},{43,10},{1,140},{43,2}} into ...
8
votes
1answer
281 views

Defining my own invisible operator

There are some invisible operators in Mathematica (\[ImplicitPlus],\[InvisibleTimes],...
2
votes
0answers
41 views

Am I using the cell option setting PageBreakWithinGroup->False correctly?

I had expected that this option would prevent a page break occurring within a group of cells of which this cell is the "group leader". In my case it is a "Subsubsection" containing a group of ...
5
votes
0answers
152 views

NMinimize seems to call function with the same values multiple times

I have to minimize a function where the evaluation of one parameter set takes very long (around 5sec) and discovered alongside, that NMinimize seems to call this ...
3
votes
0answers
55 views

Tick labels above axis [duplicate]

Is there any way to place tick marks on the x-axis above the axis? Note that I am talking about marks on the axis, not on a frame (because my graph has no frame). To be more specific, here's the ...
1
vote
1answer
443 views

Problem With 3D Contour Plot

So I am very new to Mathematica and I'm using version 9. I need to plot a function $f(x,y)$ such that $f(x,y)$ is equal to $y^2$ when $x > y$ and equal to $10 \sin(x)$ when $x < y$. I want two ...
20
votes
1answer
344 views

Highlight Pie in PieChart

PieChart has the nice functionality of highlighting a single pie when you click on it. It is then sticking out a little. See the following example: ...
0
votes
0answers
45 views

Arithmetic operations on columns [duplicate]

I have imported a file, data.txt, then plotted columns 2 and 3 as function of column 1 using the commands below. ...
4
votes
3answers
165 views

About the wrong evaluation of an integral

Here is an integral I've been studying in my research and I've just realized that Mathematica $8.0$ is unable to correctly compute it. I have 2 simple questions to ask: Is my code below correct? ...
2
votes
0answers
190 views

Cursor disappears in Mathematica 9.01

When using the template blocks from the Pallets to enter equations, the mouse cursor disappears. It also becomes difficult to set the focus to a block in a template by clicking it. This was also an ...
0
votes
0answers
113 views

Recognizing a generalized function as zero

Consider the following expression: HeavisideTheta[x]HeavisideTheta[-x] Mathematica will not simplify it further. But $\Theta(x)\Theta(-x)$ is zero if considered ...
14
votes
6answers
886 views

Default Chart Color Doesn't Match

I have looked through other posts to find out what the default plot color is, but when I use it, the color doesn't seem to match. Can anyone explain why I'm seeing different output? The reason I ask ...
4
votes
2answers
297 views

How to define the irrational domain or any other arbitrary domain?

I have found no way to define the domain of Irrational numbers. I can easily define a test to see if a number is irrational by defining: ...
5
votes
1answer
108 views

Error When Creating Package

I am trying to make my own package based on the code from this Question. The following is the code from that page: ...
0
votes
1answer
432 views

Image processing, masking

My question is about finding a object in a specific part of a image. For example, I use this image: As you can see, you will se two persons walking on the field. I only want to find the second ...
8
votes
2answers
283 views

Make Sinc'[0] return 0 instead of Indeterminate

I want Sinc'[0] to return 0, but instead it returns Indeterminate. I've tried Unprotect[Sinc] Unprotect[Derivative] Derivative[1][Sinc][0] ^= 0 But it doesn't ...
2
votes
1answer
776 views

Importing a Canon Raw file (.CR2)

This is a very top level question with no code examples attached. I have an interest in using Mathematica to read raw files coming from a Canon camera, before they are converted into jpg's, where ...
1
vote
0answers
113 views

Slider with non-linear behavior [duplicate]

I am trying to develop a small tool and I am stuck on a very simple problem. This how I want it to look: I have ...
1
vote
4answers
477 views

How do I create a list of 25 random quadratic equations in the form ax^2+bx+c?

My teacher suggests using the RandomInteger command along with the Factor command, but I cannot figure out the syntax. A, b, and c need to be non zero integers between -10 and 10.
5
votes
1answer
1k views

Asymmetric X and Y error bars on ListLogPlot

The wonderful error bar log plots package ErrorBarLogPlots from V6 no longer positions labels correctly (since ...
3
votes
2answers
556 views

Enter exact rational numbers easily with decimal notation

Is there a simple way to enter decimal numbers such as 0.123 so that Mathematica interprets it as an exact rational number 123/1000?
2
votes
0answers
112 views

How do I toggle between the program snippet form of a displayformula and the human readable form of the equation?

I have a DisplayFormulaNumbered cell in my Mathematica notebook. If I use the Cell | Convert To menu item to convert the cell to Standard or Traditional Form, the formula is now rendered as a program ...

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