3
votes
1answer
1k views

Having Trouble Fitting Complicated Exponential Function with FindFit

I am working on high pressure shock experiments and am trying to figure out a the temperature of a sample under strong shocks. I have a measure value from 4 wavelengths of a pyrometer and am using a ...
14
votes
5answers
1k views

Make legend same height as plot

One common style for density plots is to have a vertical legend that is the same height as the plot itself. Some example density plots from Google Image search: How can we make DensityPlots with ...
30
votes
3answers
1k views

Is there an equivalent of MATLAB's Workspace window in Mathematica?

For example, in MATLAB, a panel is available where one can see straightaway which variables are used and their dimension sizes. Is such a feature available in Mathematica? I really find it hard to ...
10
votes
2answers
320 views

Is it possible to embed a Youtube video in a CDF?

I'd like to embed a Youtube tutorial video inside a CDF. I'm guessing this is not possible as my search for how to do this has been in vain. I'm imagining an embedded Youtube video like one sees on ...
14
votes
1answer
388 views

Unexpected behavior of UnitConvert

When I evaluate this expression: ...
11
votes
2answers
807 views

Combinatorica package and graph-theoretical issues

I've searched for a solution to my problem a couple of days, and I didn't find one. Hope you guys can help me. I'm currently trying to solve some graph-theoretical problems. One of them is to find ...
5
votes
1answer
291 views

An easier and more efficient way to combine lists?

I currently have a two lists. The first list contains independent variables $x$, and the second list contains dependent variables in the form of $\{\{f[1][x]\},\{f[2][x]\},...,\{f[n][x]\}\}$. I want ...
27
votes
7answers
2k views

Simpler input for the new unit support

I've been playing with the new unit support in Mathematica 9. It seems very useful, but the syntax is very verbose. Instead of typing: ...
4
votes
0answers
130 views

Why does $Path change when I examine it in new cell after I just changed it?

This is really driving me crazy. In one cell, I change $Path by removing from it un-needed paths that I do not want for the duration of a computation I will be ...
2
votes
1answer
248 views

MathKernel and MathLM interaction

If one restarts MathLM on a Linux server, will that restart mathkernel as well? In other words, will restarting MathLM affect the current jobs running that use MathKernels? Thanks.
4
votes
1answer
242 views

speed up iteration with conditionals plus optimize memory usage

Given list1 and list2 whose elements are vectors of a certain (fixed) dimension, I am interested in the behaviour of a scalar ...
2
votes
1answer
170 views

How to find full names of all packages already on the $Path?

I'll show one specific example of what I am trying to do, I think it will explain things. On the default $Path there exist (in version 8) the following 4 packages ...
1
vote
2answers
398 views

How can I set an image as the background of a panel?

Is it possible to set an Image as the Background of a Panel? I've studied all the options in ...
20
votes
1answer
325 views

How can I see which transformations Simplify attempts?

The documentation for Simplify[expr] says that it performs a sequence of algebraic and other transformations on expr, and returns the simplest form it finds. How can I see which transformations it ...
9
votes
2answers
3k views

How to expand tan(x+y) as normal form?

TrigExpand@Tan[x + y] gives $\frac{\sin (x) \cos (y)}{\cos (x) \cos (y)-\sin (x) \sin (y)}+\frac{\cos (x) \sin(y)}{\cos (x) \cos (y)-\sin (x) \sin (y)}$ but I ...
5
votes
3answers
755 views

Square both sides of an equation?

Can I define an equation (for example, x+1 == y^2 + 2), and tell Mathematica to square both sides? If not, what is an equivalent way to achieve this?
7
votes
3answers
815 views

How to manipulate gauge theory in Mathematica?

I want to know if there is a way of typing into Mathematica an expression like the following, $$\epsilon^{\mu \nu \lambda} f^{abc} A^a_\mu A^b_\nu A^c_\lambda + g\epsilon^{\mu \nu \lambda} A^a_\mu ...
5
votes
3answers
284 views

Executing Mathematica script from inside SQL Server

Does anyone have experience in calling Mathematica from inside SQL Server to do calculations? For example, how can I make a Procedure that uses Mathematica? Or a job that runs some Mathematica script? ...
5
votes
1answer
126 views

How to retrieve the remaining cashflows from a FinancialBond object

I would like to get the cash flows and dates for the remaining coupons and principal repayment for a FinancialBond object. These must be calculated internally by ...
5
votes
2answers
165 views

How is OptionsPattern[] defined? Can I replicate this?

I am writing several functions which all take similar input parameters (a complicated nested list structure). Is there some way for me to define a pattern that can be used in multiple places and ...
1
vote
1answer
127 views

Can I get a trace of the complexity of a convergent sum?

Motivation--- I have a glimmer of an idea that a convergent sum could be considered a self-referential number similar to a fractal. I would like to play with it for a while. I have the following ...
2
votes
1answer
161 views

How can I prevent graphics scaling with CDF notebook size?

Recently we saw how to produce xkcd-style graphs. I evaluated the same code and deployed the result to CDF. Everything is working fine except that, in the CDF notebook, the graph is scaled according ...
6
votes
4answers
1k views

Replacing functions

Given an expresion 'e' in terms of a function 'f' and given another function 'g', how could I write a Module that replaces the function f to g in the expresion e and returns it? An example: ...
10
votes
2answers
605 views

How to send output of Information[] command to a text file?

I am having little hard time sending output of Information[] command to a text file. related question How to write output to an external text file in addition to ...
3
votes
1answer
671 views

Plotting a complicated vector field

If we consider the vector $\left ( A \cdot \nabla \right) \: B$, we have in Cartesian coordinates $$\left ( A \cdot \nabla \right) \: B = \left ( A \cdot \nabla B_x \right ) e_x + \left ( A \cdot ...
2
votes
1answer
358 views

Two questions about drawing tool

In Mathematica, Ctrl+1 inserts a new picture. Using the drawing tool, we can draw many things. It seems to me that there is no way to control the drawing angle. So here are my questions: How to draw ...
13
votes
1answer
306 views

Pass Options to Export[]

I'm working with Options to change the look and feel of some generated Graphics by passing Options to several functions, one of them being Export[]. For example: ...
8
votes
1answer
478 views

Changing default ImageSize in the frontend?

I would like graphs to appear somewhat larger in my notebooks (running v8.0.4 on OSX 10.8.2). Naturally I can specify ImageSize in each individual plot, or drag ...
9
votes
2answers
3k views

How do you remove noise to detect just the human voice?

How do you detect different sound frequencies and cut off parts in an audio file? Among instruments, how do you pick up the human voice?
5
votes
2answers
2k views

How do I plot the derivative of a set of experimental points?

I have a set of points like this: P = {{$x_1$,$y_1$},{$x_2$,$y_2$},...,{$x_n$,$y_n$}}. I want to plot them and also plot the derivative of that graph. How can I do this with Mathematica? Is there a ...
3
votes
3answers
649 views

Comparing 2 Data Sets in a Single Plot

I have 2 data sets, data1 and data2 with large (in the thousands) amounts of data and I want to compare them in a plane. They ...
4
votes
3answers
282 views

Extracting Pareto elements from a list

How can I extract the Pareto elements from a list? For example, for that list: ...
4
votes
1answer
333 views

Automatically wrap abritrary-length text in graphics

Question: How to insert Styled text of unknown style and length into a graphics and have it wrap at a Scaled width? Attempt: I ...
12
votes
2answers
432 views

Tell ParallelMap[] to use just specific kernels

Is there a way to tell ParallelMap to use just some specific kernels (as is possible for ParallelEvaluate)? Background: I have ...
7
votes
1answer
217 views

How can I add arbitrary code into DefaultKeyTranslations.tr?

The solution to this question on how to get latex code for a text cell (which Mathematica doesn't do correctly) was formulated as a palette but I need it as a keyboard shortcut. How can I add an ...
7
votes
4answers
195 views

Generating all matrices with 1 (possibly) replaced by -1

I have a matrix $M$, whose dimension I am unsure of, which has only $\lbrace0,1\rbrace$ entries. I would like to generate all the possible matrices that result from changing (some subset) of the $1$'s ...
3
votes
1answer
107 views

Force ellipsis to print an end of an expression

For pedantic reasons I want to display an infinite sum of fractions in fractional form (i.e. as 1/x not as x^(-1)) with an ellipsis at the end of the expression. I have tried a number of ways and ...
3
votes
3answers
239 views

Are table headings functional?

Are table headings for aesthetics only? If I have: ...
8
votes
3answers
838 views

Analytically finding critical values in a hysteresis curve made with ListPlot

Let me start with a super basic explanation of what I'm trying to do, and I will follow with a more detailed discussion afterwards. From data in the form shown below (a ...
2
votes
1answer
957 views

Lie-Bracket of two vector fields

I'm new to Mathematica (installed couple of hours ago) and I need to compute a few Lie brackets between two vector fields $f$ and $g$. $$ f\left(\mathbf{x}\right) = \left( \begin{array}{c} ...
6
votes
1answer
394 views

How to convert a transfer function model to a zero-pole-gain model?

Mathematica has a function to convert TransferFunctionModels to StateSpaceModels: ...
4
votes
1answer
201 views

How do I get a list of digits for a number?

I have this 200 digit number where I want to get the IntegerDigits, but the decimal point is in the way. ...
9
votes
6answers
246 views

Is there a better way to add a “key” for the list of GatherBy?

In ruby , 1.upto(10).to_a.group_by{|x| x%3} gives {1=>[1, 4, 7, 10], 2=>[2, 5, 8], 0=>[3, 6, 9]} I would like use ...
1
vote
1answer
193 views

Find the derivatives of arbitrary order of a function found using NDSolve

For the following initial value problem BC[b_]:=x[0]==b; eq[b_]:=NDSolve[{equation==0, BC[b]}, x, {t,0,1000}]; body[t_,b_]:= x[t]/.eq[b]; one could define the ...
0
votes
1answer
119 views

Move selection to next Output and export to CDF

In my quest to a custom "Save as HTML" (please see context here) I am now able to iterate through the notebook, grab Input cells decorated with a CellTag that, by convention, is going to be a file ...
5
votes
2answers
398 views

Fast Karatsuba Squaring, how to?

I want to improve timing of squaring for big numbers. So I asked What is the fastest way to split a number into parts and What is the most efficient way to add zeros to end of a number with several ...
22
votes
3answers
1k views

Reading periodic elements from a large file

I have a large binary data file (big endian) with 100+ million "rows" of 11 elements, combination of floats and integers. This is the format: ...
2
votes
2answers
283 views

Labeling a Plot with a Slash for Division Sign

I'm trying to label a 2D plot with something like $A/B$ rather than $\frac{A}{B}$. I have tried: Plot[Sin[x], {x, 0, 10}, AxesLabel -> {HoldForm[A/B], y}] ...
3
votes
1answer
78 views

How to create a notebook that has the form (not function) of the System Information Notebook?

Mathematica's system information display (click Help>AboutMathematica>SystemInformation to see it) is nicely packaged. Is it just a notebook with a TabView and other controls in a notebook with ...
0
votes
1answer
391 views

Generating lots of Examples in Polynomials Rings

I'm studying polynomial rings and i would like to know some tricks for generating lots of examples. For instance, suppose i'm interested in polynomials over the integers mod (2,x^3 + 1). To get a ...

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