10
votes
1answer
1k views

Search the neighborhood area along a line in an image

I am trying to search for the black areas along a line (the horizontal line shown below). Though it is straight in this picture, it could be of irregular shape in other cases. It seems that the ...
1
vote
1answer
195 views

How can one type a box with “x” marked?

In some text portion of my notebook, I would like to be write check boxes which are empty, check marked or "x" marked. The following commands work for the first two: ...
3
votes
3answers
221 views

Alternative to using global variables in functions?

Often times I find myself using unevaluated variables (i.e. they show up blue) as dummy variables in whatever I'm returning such that I can evaluate them as needed later on. A simple example is as ...
-1
votes
2answers
752 views

Convenient methods to sum select rows (or cols) of a matrix? [duplicate]

What are some convenient methods to sum selected rows or columns in a matrix? This question Summing along rows or columns of a matrix only addresses how to sun entire rows or columns ie, by level. ...
4
votes
1answer
373 views

Is it possible to create a compiled function with some symbolic arguments?

I am trying to create a compiled function that takes in several arguments. However, some of the arguments contain symbolic entries and thus I get the following error message when executing the cell ...
5
votes
1answer
202 views

Trouble with Flatten[]

I made this function: f[g_] := Table[{ToExpression[ToString[x] <> ToString[n]], 1, 3}, {n, 1, g}] When I evaluate the function with some g (say 8), I'll ...
1
vote
2answers
260 views

How to blend some colors on a curve

I need to define a color gradient on a 3D curve, but I'm having some problems with this. Suppose we have a 3D curve defined as a parametric function of some real variable ...
3
votes
1answer
237 views

Autocomplete short symbol names in non-global context

Is it possible in v9 to autocomplete the short symbol names when one is operating in a context other than Global`? I.e. after evaluating the following: ...
1
vote
3answers
121 views
3
votes
3answers
6k views

Label points in plot with a text

I'm a newbie at Mathematica and I couldn't find how to label the maximum and the zero of a simple function in Plot with their names: ...
19
votes
4answers
789 views

Accessing list elements by name

First, a bit of a long introduction to my problem: I only have a few weeks of Mathematica experience. I am creating a mathematica application that calculates some material properties of steel based ...
4
votes
1answer
300 views

Plot an undefined function

When I plotted an undefined function, Mathematica also spends considerable time to process it. It returns a blank figure necessarily. What confuses me is where the ...
14
votes
2answers
331 views

Haiku Extractor

Inspired by the cool Tumblr Haiku Times that searches for accidental haiku in New York Times articles, I tried my hand at implementing such a search in Mathematica for my own text samples. I'm still ...
5
votes
2answers
370 views

How to capture Print output

How can I capture output from Print from a function which does not leave the printed object as its final output, (and which I do not wish to edit)? E.g. ...
0
votes
1answer
114 views

How does SocialMediaData determine vertex size

How does SocialMediaData determine the size of graph vertices, e.g. on what does the vertex size depend in, say, a Facebook friend network graph?
3
votes
1answer
234 views

Compile: Putting integers into a list

The first part below is already answered, but I've got another question which I think is closely related to this one, so I edited my question. First part: I started compiling in Mathematica a few ...
5
votes
2answers
549 views

Stop use of scientific notation when displaying FrameTicks

I have a dynamic graph which changes depending on the current selection from a drop down box. All selections from the drop down box give fine results except one. For the one selection it shows the ...
3
votes
3answers
1k views

Plotting multiple parametric functions with different intervals

I want to make a parametric plot like this: ParametricPlot[{{2 t, -10 t^2}, {t, 2 t}}, {t, 0, 2}] I have tried the following but it doesn't work: ...
2
votes
0answers
41 views

Does an equivalent of marks in vim exist for navigating notebooks quickly? [duplicate]

Is it possible in the Mathematica front-end to associate a keyboard shortcut with a cursor location in the notebook (kind of like marks in vim) so that one can return to them quickly later? (Just ...
5
votes
1answer
182 views

Can the elements of a list always be sorted into a canonical order?

As the title states - does a unique order exist for any Mathematica list to be sorted by the Sort[] function (or as returned by a function that treats lists as ...
1
vote
1answer
112 views

How to evaluate an integral

I am trying to evaluate this integral Integrate[(kx^2/2)*Sin[\[Lambda]x], x] from -pi/2(lamda) to pi/2(lamda) Everything there is a constant, and the only ...
15
votes
3answers
1k views

How to plot a 3D surface with a simple black and white style?

Mathematica has great plotting capabilities. However, sometimes what is needed is a very basic black and white plot without textures, lighting, glow and other complex features. So, here is my ...
4
votes
1answer
158 views

Using the mouse coordinates to index a matrix

I would like to "write" on to a matrix using the mouse. That is, I would like to use the integer value of Locator coordinates (p) to index a matrix. Then, if the mouse button is down, write a 1 in ...
5
votes
2answers
1k views

Plot 2D Vector function in 3D

I want to plot a 2D vector function such as $F(x,y) = (a(x,y),\,b(x,y))$ in a 3D graph so that the vectors are embedded in the xy plane. I tried to do the following: First I defined a piecewise ...
2
votes
1answer
149 views

How do I remove this awkward plane? [duplicate]

Using Plot3D, I tried to plot $x^3 + y^3+3xy=z$ ...
4
votes
1answer
289 views

Simplifying numerical expressions involving special functions

I've encountered the following problem. There is the identity (Legendre's relation) that the special functions EllipticK[x] and ...
13
votes
5answers
1k views

How do I obtain the enclosed area of this particular parametric plot?

I'm trying to find a way to obtain the enclosed area of this particular plot. Can someone show me how? ...
3
votes
1answer
259 views

Numerical Error with Large Matrices

I am writing a Finite Element Analysis program in Mathematica. The code involves handling a large matrix with large entries. I get an error when I try to use Mathematica's "LinearSolve" to solve a ...
13
votes
4answers
693 views

FullSimplify Over Reals Automatically

Frequently, Mathematica will produce some expression in a complicated form, with a number of unset variables. For me, it is rare that I would be interested in solutions that are generalized to both ...
15
votes
4answers
1k views

Plotting data points: Optimizing size and visuals

The following problem is one that may have showed up to you while plotting a large data collection. Suppose you have a data set of say 1 million points. ...
4
votes
1answer
190 views

Precision of rendered Rectangles in stiff-scale graphics

The attchd graphics called chromograms represent a set of discrete-state, continuous-time - ie, discrete-event signals, generated with Mathematica 9 on OSX with a Cinema display. • Top 2 rows are ...
1
vote
1answer
163 views

Finding coefficients that make certain functional expression vanishing

My problem is to find a procedure that gives coefficients which make certain functional expression vanishing. For example if I have a polynomial $P(x)$ of one variable $x$ given by $P(x)=a_0+a_1 ...
4
votes
1answer
182 views

How do I group a nested list further according to a rule, and average selected elements?

I have a nested list of numbers like { {36, -244}, {37, -225}, {38, -197}, {48, -200}, {49, -181}, {50, -133} } which needs to be further nested into "bins" according to a rule. I would describe the ...
2
votes
3answers
661 views

How to make a plot on top of other plot?

I want to plot two functions. One should appear on top of the other. The x axis has the same values for both functions, but should appear twice (the second- upper I want to be dashed). y axis should ...
8
votes
1answer
588 views

High Contrast Syntax-Highlighting

I have a neurological disorder which causes me to have migraines if I look at a white computer screen. To combat this, I have put the following at the top of all of my Mathematica notebooks: ...
3
votes
2answers
389 views

Density plot for data with a wide dynamic range

I'm generating some figures for a paper. One of them has a pattern like the following figure: ...
0
votes
1answer
163 views

No Tukey Test on ANOVA package

I'm trying to use the ANOVA package and have mathematica display the Tukey PostTest, but all I get is this: ...
1
vote
1answer
976 views

ErrorListPlot Legend with Markers

I'm trying for some days now to integrate markers in my legend. I have a ErrorListPlot with markers and a legend but difficulties to realize the markers in the legend as well. Thanks a lot for your ...
1
vote
1answer
145 views

How to export a plot into a file?

I am trying to save some graphics into a file, and it seems impossible. ...
6
votes
1answer
790 views

Does Mathematica solve transfer functions differently to Matlab?

Please note this is an edit to the same question posed a few weeks back: I'm using Mathematica to derive the transfer functions for a three phase AC/DC inverter. Given below is the code for the ...
4
votes
1answer
245 views

How I get random keys from keyboard for game controls?

I'm trying to make moving object using controls. I'm trying to do this using Buttons. The code is ...
6
votes
2answers
146 views

Making ColorSetter work like a PasteButton

I might be missing something obvious here. I am building a palette for constructing code to make certain graphics. The idea is that my colleagues can click buttons instead of having to know the right ...
0
votes
1answer
155 views

Simplifying Complex Numbers that contain physical units

I am trying to evaluate the following: Simplify[Meter Nano Re[(a + I b)/(Meter Nano)], Assumptions -> Element[{a, b}, Reals]] However, Mathematica returns: ...
4
votes
1answer
198 views

OpenGl Z-Order Equivalent in Mathematica?

I am trying to draw the arrows in this picture on top of the two parallel plates. In OpenGL I would just set the 4th coordinate the z-order to be closer. Any ideas how to draw them on top in ...
2
votes
1answer
140 views

Looking for documentation on code editor's color/style highlighting

Where can I find reference documentation (as opposed to, e.g., tutorials, etc.) on the meanings of the various color/style highlightings that Mathematica automatically assigns to code as one types it? ...
5
votes
2answers
285 views

Computing the sign of the real part of eigenvalues in a 3D linearized system with 3 parameters

So I have this dynamical system given by: $$ \left\{\begin{aligned} x' &= a(y-\phi(x))\\ y' &= x-y+z\\ z' &= -by \end{aligned}\right. $$ where $\phi(x) = \mu x^3 - \nu x$ and $a,b,\mu,\nu$ ...
2
votes
2answers
85 views

How can I get a Button to evaluate an expression containing Get? [duplicate]

I have problems making Button evaluate an input like this one: Button["Load", Get["/Users/simonlausen/Desktop/Input/ex1.mx"]] ...
2
votes
2answers
284 views

NMinimize problem again

Following up my previous question which got great replies, I am now trying to do ...
3
votes
1answer
676 views

Getting over Mathematica Bar Chart Limitations….

I am trying to create a pareto chart for some non technical folks and having the hardest time formatting it correctly… Here’s my sample code: ...
3
votes
2answers
259 views

Computing the minimum distance in a contour plot

I have the following Mathematica code ...

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