8
votes
1answer
1k views

Logarithmic scale in the legend of a ListContourPlot

Is there a way to use a logarithmic scale in the colour legend of a ListContourPlot? The contours can be logged by taking the ...
4
votes
2answers
293 views

How can I superimpose points or disks on an image at specified coordinates?

I have a TIFF image of 640 x 640 pixels, over which I would like to plot a list of points or disks of small radius. I have been testing different alternatives and I found ImageCompose command. ...
15
votes
2answers
639 views

Combining 3 graphics of different coordinate systems

I have 3 graphics in different coordinate systems and I want to join them in as in the following figure. This is just a sample figure, not the real one. My functions are as follows. ...
4
votes
2answers
224 views

About extension fibonacci

I have been trying to solve this problem, it worked slow. I know there is a efficiently way. How do I get it? The following is my code: ...
1
vote
1answer
143 views

Changing the number of locators with SetterBar

Typically when adding locators I would use a button i.e. something along the lines ...
1
vote
2answers
217 views

Filling for ListPolarPlot

I want to use Filling for ListPolarPlot in such a way that the points in the list are joined to the origin with a line colored ...
1
vote
2answers
227 views

While-Loop Linear Projection

I'm would like to do a linear progression for a recursive relation of a consumption function. Combining my program skills and my sparse knowledge of mathematica, I was thinking about doing it in a ...
14
votes
3answers
891 views

Best Practice to write ::usage for own package functions

I'm writing an own package with Mathematica, that I would like to make available for others. In order to do that (and for my own usage of the package), I would like to write ...
18
votes
1answer
243 views

Open and search Documentation-Center

In notebooks you can press F1 (or Shift+F1 for a new window) to: open the help page of the marked Symbol or the Symbol under ...
17
votes
1answer
461 views

Simulating Theatre puzzle

I have been trying to simulate the process of the theatre puzzle from the Joy of X (Strogatz). The puzzle, and some relevant material are here. My simplistic coding for this process follows: ...
0
votes
1answer
117 views

Non solutions returned by NSolve. And why does it return both phi and Cos[phi]?

Similarly to this thread NSolve gives additional solutions that don't satisfy the equations! NSolve returns "spurious" solutions, even increasing the working precision ...
19
votes
7answers
630 views

How do I obtain an intersection of two or more list of lists conditioned on the first element of each sub-list?

Given two lists like list1 = {{1, 1}, {2, 4}, {3, 9}, {4, 16}}; list2 = {{2, 6}, {3, 9}, {4, 12}, {5, 15}}; I would like to produce an output like ...
31
votes
4answers
2k views

Are Mathematica 9 units really slow?

This generates 75 unitized pairs for a plot that displays physical units: ...
2
votes
0answers
297 views

FindRoot - Speed and errors

I am using FindRoot[] to solve a complicated equation. It seems I get the correct answer even though I get errors about an ...
11
votes
3answers
4k views

Find all roots of an interpolating function (solution to a differential equation)

I'm trying to find all the roots of the solution to a differential equation. Using NSolve or Reduce I don't get the roots, so I'm using an iterative method which I found in physicsforums.com. This ...
9
votes
2answers
336 views

How to partition a list and leave in the last sublist which is of different length? [duplicate]

How to partition a list and leave in the last sublist which is of different length? In[75]:= Partition[{1,2,3,4,5},2] Out[75]= {{1,2},{3,4}} I want it to be ...
4
votes
6answers
226 views

Filter list with different list in it

I have a list like: {{{4, 14}, 1}, {{4, 15}, 1}, {{4, 16}, 1}, {{4, 17}, 1}, {{4, 18}, 1}, {{4, 14}, 3}, {4,15}, {{4, 16}, 2},{4,18}} Now I want to ...
3
votes
3answers
777 views

Solving Integrals

Here's a problem that I don't understand. f[x_] := Exp[Cos[3*x]] g[x_] := (1/3)*x^3 - x^2 + 2 When I try to find the limit: ...
21
votes
3answers
1k views

RegionPlot3D in cylindrical or spherical coordinates?

RegionPlot3D is awesome. Unfortunately, it appears to work only for Cartesian coordinates. While there are ways to draw surfaces in spherical or cylindrical coordinates, I can't find a way to draw ...
12
votes
3answers
2k views

How can I convert a complex number a+b I to the exponent form A Exp(I phi)?

When I have an expression such as: (1/4 + I/4) ((1 - 2 I) x + Sqrt[3] y) it is hard to get an intuition of the number. So I want to convert it to the complex ...
13
votes
5answers
3k views

How to draw a great circle on a sphere?

I apologize for the text description, but new users are not allowed to post images. I want to draw a circle that cuts through the center of a sphere and has an inclination of 15 degrees with the ...
9
votes
1answer
99 views

Different behaviour of ValueQ inside and outside of a loop

I need to store a rather big number of variables and I tried to do that by storing each variable as Z[n] with varying n. I guess this was not my best idea. The first problem I encountered is when I ...
2
votes
2answers
561 views

Spreading colors in ListContourPlot

I have a data file with triplets. The first two numbers indicate the x and y position, while the third one is the log10 value of a particular indicator. I want to create a 2D plot in which the ...
2
votes
2answers
1k views

How to prepare data for ListVectorPlot[]?

I was trying to plot a few velocity vectors measured at given points. However I am unable to do this with ListVectorPlot[] function. I get error each time I try to ...
11
votes
1answer
519 views

user defined functions, how to save them for future use?

I need certain user defined functions over and over. I was wondering how can I define and where and how to save them such that each time I start a notebook, these functions are available and need not ...
3
votes
1answer
128 views

How to make a pattern to change x^(2/y) to (x^2)^(1/y) for any x and y?

This might have been asked before. Please let me know if it is. I was looking at an interesting Mathematica question in students forum and trying to solve it, and a chance to learn more about ...
0
votes
1answer
1k views

Loops and subroutines [duplicate]

Possible Duplicate: Alternatives to procedural loops and iterating over lists in Mathematica I am new to Mathematica and not familiar with functional programming. In particular, I have no ...
8
votes
2answers
369 views

Tailoring RegionPlot3D with PlotPoints?

This seemingly tame solid gives Mathematica (v9) a bit of a workout if you want to generate a good picture: ...
14
votes
1answer
955 views

Sales forecast using SARIMAProcess and time-series data

I would like to ask for help in how to use the new Mathematica 9 time series functions to make some sales forecast. For example, for one of our stores, I have this data set with 35 points, from ...
2
votes
0answers
98 views

Why cant Mathematica solve this equation? [duplicate]

Possible Duplicate: Can Reduce *really* not solve for x here? Why cant Mathematica solve this equation? ...
21
votes
2answers
860 views

How to generate a picture like this?

How to generate a picture like this? I'd like the surface of the manifold to randomly distort.
1
vote
1answer
462 views

How to extract Solve results as variables [duplicate]

Possible Duplicate: Assign the results from a Solve to variable(s) In the following example: ...
15
votes
4answers
2k views

how to differentiate formally?

I have been wrapping my head around this for a while now and I have not found a solution so far. I want to work with an arbitrary number of variables in mathematica and use some built in functions. ...
0
votes
1answer
230 views

Iterative Function Mapping [duplicate]

Possible Duplicate: How to nest my own “times” function to get powers What I want to do is something like : Sin[...Sin[Sin[Sin[Sin[x]]]]] Basically, ...
1
vote
1answer
109 views

Draw from HistogramDistribution with ParallelTable

I wanted to check something, but ran into troubles using HistogramDistribution in combination with ParallelTable. The code does the following: Compute a HistogramDistribution of some sample and use ...
6
votes
1answer
314 views

Making the TableForm output into two columns

I have a program that calculates Christoffel symbols for a given metric, and the output I'm getting now is such that I have every calculated symbol in one column like this: I'd like that I could ...
3
votes
2answers
168 views

Subscript and Part: What's going on in this example?

Example I came across the following simple example from A Beginner's Guide to Mathematica, by McMahon and Topa, which I believe was written circa version 5.2. (FWIW, I'm using v9.) ...
4
votes
1answer
2k views

Remove annoying Conjugate

Here is an expression ...
0
votes
0answers
70 views

Extracting box coordinates [duplicate]

Possible Duplicate: Dimensions of the results of Text[] within Graphics[] In writing the following code, I had to figure out what values to give d by trial and error. Is there a way to ...
3
votes
1answer
601 views

How can I express an algebraic expression as a product?

I have a simply expression that I can see that I can express as a product. ...
1
vote
1answer
214 views

Symbolic calculation

Is there any software where this kind of symbolic calculation is possible? s = 0 for i = 1 to m j = 2 i + a - t if (j > 0) s = s + a I want s as a ...
3
votes
1answer
252 views

Evaluating a function on permutations of its arguments

Say I have a function "temp" of $n+1$ variables, $y,z1,z2,z3,...,zn$. I want to test if my function has certain symmetries like swapping $y$ with square of any $z$, swapping any two of the zs, ...
12
votes
2answers
1k views

Push-pin Art – Convert image to R-Y-B-W-Blk color space

After seeing an example of what is called “Push-pin Art”, I assumed that Mathematica would be able to handle the kind of image processing required to convert an image to this format. I am not well ...
4
votes
1answer
163 views

Write-protect documentation for self-written Add-on package

My package works fine so far, and now I want to add some documentation. I have put a file in ...
6
votes
2answers
746 views

Force Plot Area size to be equal excluding axes

I have two plots, both with the exact same formatting (frame, text style, etc.). One of them has 2-digit values for the y axes, the other has scientific notation because the value are large. In ...
1
vote
1answer
299 views

Bar chart labels disappear when PlotRange is used

I have used Placed[Before] to place labels on the labels before the bars, but when I specify a plot range, the labels disappear. I need a solution wherein I can use ...
10
votes
2answers
2k views

Is there a Mathematica equivalent to MATLAB's logspace? [duplicate]

Possible Duplicate: How can I get exactly 5 logarithmic divisions of an interval? I want to use Table to generate a list of items, but want the indices ...
2
votes
2answers
360 views

Lists of coefficients of derivatives

I want to extract two separate lists of coefficients of derivatives. If I have, for example, ...
5
votes
1answer
150 views

Reloading package after accidental Remove[] of symbol

I was using Needs["PlotLegends"] By chance I removed ShowLegend by Remove[ShowLegend] How do ...
1
vote
1answer
272 views

How do I simplify an embedded sub-expression without affecting other sub-expressions?

I have an expression which is very large and which has several sub-expressions with head Conjugate. What I want to do is simplify the ...

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