All Questions

2
votes
1answer
108 views

InterpolatingFunction with growing Domain

I want to find roots of a function that is very slow to calculate (the function itself involves a bunch of FindMaxima) so I interpolate the function in a region where I think it likely the the root ...
7
votes
3answers
292 views

Unencoding encoded URLs in a function

Is there a built-in function for decoding encoded URLs in Mathematica? I would like to convert an encoded URL, for example ...
2
votes
3answers
110 views

BarChart without axes neglects the last zero of a list

Creating a BarChart with {1, 2, 3, 0} as BarChart[{1, 2, 3, 0}, Axes -> False, Frame -> True] gives me only the first three bars, a chart identical to just ...
8
votes
3answers
247 views

Applying a transformation rule on an Image

I haven't been able to figure out why the following doesn't work: ...
5
votes
1answer
147 views

Is it possible to lower the bitwidth of (floating point) numbers?

The answer to this question will most probably be a definite no. Nevertheless, I would like to know whether it is possible to represent reals in the memory on less than the standard 32 or 64 bits ...
2
votes
2answers
2k views

How can I change the position of my plot legends?

As the title indicates, I want to change the current position of the legends in a combined plot. The Mathematica code I used is ...
3
votes
1answer
131 views

Can one optimize AutomaticNumbering feature?

If one wants to use the automatic numbering feature of Mathematica, he has to make tags for cells of the type he wants to be referenced to. Then, as soon as he needs to make a reference to the tagged ...
3
votes
4answers
221 views

Descriptive statistics of two events

I am trying to use the descriptive statistics feature of Mathematica to answer the following question: suppose I have two events, A and B, whose occurrence is described by a normal distribution around ...
4
votes
3answers
485 views

Prevent Mathematica to automatically evaluate Manipulate at start

I'm using an initialization cell to import a lot of data: data = Import[myFiles]; and then I use a custom function to display this data with Manipulate: ...
0
votes
1answer
237 views

Why don't I see all the grid lines in my combined contour plots?

I am trying to display four continuous functions, but when I try to combine them withe a single Show, I can't see the second vertical line. I suppose the problem is ...
4
votes
1answer
1k views

Is it possible to impose “Assumptions” in DSolve or equivalent? (differential equation solving)

When DSolve tries to solve differential equations, it is sometimes not smart enough to generate conditions according to different possible value of parameters. ...
3
votes
1answer
140 views

NetLink Exporting Images doesn't work (Unknown string escape)

Exporting Image files (intermittently) doesn't work: I get messages back indicating the error is to do with escaping characters: ...
10
votes
1answer
889 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
151 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
202 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
545 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
254 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
176 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
233 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
212 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
2answers
81 views
3
votes
3answers
4k 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
641 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
263 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
307 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
289 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
103 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
200 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 ...
4
votes
2answers
409 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 ...
2
votes
3answers
770 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
39 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
166 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
109 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
991 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
135 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
962 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
132 views

How do I remove this awkward plane? [duplicate]

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

Simplifying numerical expressions involving special functions

I've encountered the following problem. There is the identity that the special functions EllipticK[x] and EllipticE[x] satisfy: ...
10
votes
5answers
949 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
207 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 ...
12
votes
4answers
493 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
963 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
177 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
141 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
156 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 ...
1
vote
3answers
521 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
499 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
363 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
139 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
740 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 ...

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