All Questions

288 views

How to replace subscript symbols

I have an expression with subscripted variables. I would like to replace all those terms with other symbols. For example, $P_1 + P_2^3 \rightarrow P1 + P2^3$ I used the following code but it doesn't ...
1k views

Solving a system of nonlinear coupled ODEs

I tried using NDSolve to solve the following system of equations: ...
706 views

Plotting a piecewise parametric curve [duplicate]

I have no idea how to plot the following piecewise parametric curve in Mathematica; ...
87 views

Generate higher dimensional box vectors

I'd like to generate integer vectors in $\{-M,-M+1,\dots,M\}^n$, where $M$ and $n$ are parameters. For a fixed $n$, say $n=3$ for instance, I only know I can use ...
132 views

How to always display current section identifier (number, name) in notebook?

Because I find myself relocating frequently within a long notebook divided into sections, subsections, & subsubsections, I would like to display the identifying information for the section, etc. ...
509 views

Elegantly adding two differently spaced lists of ordered pairs $(x, y)$

Suppose that I have two lists, list1 and list2, of ordered pairs $(x, y)$. The two lists are differently spaced in $x$; some ...
521 views

Mixing Text and Formulas

I'm trying to do some typesetting in which I mix text with formulas. The Mathematica documentation has a section titled "Mixing Text and Formulas" which pretty ...
176 views

NDSolve error when solving pde

I am trying to calculate speed of viscous fluid in a rotating hollow sphere. The sphere is rotating round z axis. The fluid is incompressible. I used Navier-Stockes equations. The only boundry ...
204 views

Jumps in NDSolve results

I need to compute using NDSolve routine, some function $F(x)$, having two possible values $F_1(x)$ and $F_2(x)$ depending on whether the argument exceeds some ...
263 views

How to partition a list into sublists in a similar way to Histogram

I have a list of list as below (I show part of it) ...
275 views

Ranking a vector containing ties

How can I rank a vector such that the ties are replaced by their middle ranks. For example, {1, 2, 2, 3}. I want to rank this vector but the ties must be replaced ...
883 views

Frequencies represented in a DFT list (Fourier[])

I have a sound sample (sample rate: 44100). When I have a list l with n successive elements from the sample, ...
101 views

Missing some packages?

I am trying to use a program written by someone else. When I run the program, I am supposed to get a number as a result, however, what I got is some complicated result with "InterpolatingFunction" ...
198 views

How to Use ProbabilityScalePlot with Censored Data?

I am trying to reproduce a ProbabilityScalePlot of censored data shown here (see Sample Analysis Plot). Here is my Mathematica code. First I deal with the uncensored case. ...
1k views

Why does Mathematica order polynomial forms in reverse from traditional order?

I could very well be missing something obvious, but this has always bugged me with Mathematica and I don't know why it does it or how to fix it. If I enter any polynomial, say, x^2 + x - 1 for ...
4k views

Filling Between Curves [duplicate]

I want to fill in the region between the curves. So far I have this: Plot[{x + 7, 9 - x^2}, {x, 0, 1.5}, Filling -> {1 -> {2}}] But I want something ...
561 views

Automatically dealing with “disable dynamic updating”

I'm programmatically creating notebooks containing dynamic content. When a new notebook is being created, a window pops up: I then manually click on "Continue" and it will create the notebook. The ...
181 views

Using absolute locator coordinates in Manipulate

In this simplified code below, I'd like to display two plots within Manipulate, and use the Locator controltype to set the value ...
349 views

How combine pure functions of several slots? [duplicate]

How can one define in a functional way a 1st-order linear differential operator involving several independent variables that can then be applied to a function of that many variables? Consider an ...
164 views

Lost and found Tooltip in ListPlots

I came upon a strange Tooltip behavior in ListPlot and ListLogPlot. Consider the following ...
244 views

FrameLabel and OverTilde

What is the problem with this expression inside ListPrint? OverTilde generates here a mess: ...
185 views

How to use all the kernels efficiently

We build a project with Java and Mathematica technologies. For this project we have written a bunch of functions in Mathematica and integrated some functions in one ...
178 views

Prevent mathematica from simplifying

How can i prevent Mathematica from automatically simplifying the expression Sqrt[a/b]? In case a=1 and ...
89 views

Master Document

I'm wandering is there Master document concept in Mathematica so that the counter will be counted sequencially in master document. Mean file in child document, the counter follow from master document. ...
92 views

Calculations in sequence

I have a this calculation, as you can see it is doing a calculation on each list, from list 1 to list 4 of the datafile. My problem is that using Mapthread to do this calculation does not work because ...
103 views

Need a generalization of RootApproximant to recognize linear combinations over algebraic numbers

RootApproximant does a very good job when I need to recognize an algebraic number and when enough of its digits are known (or even when an unlimited number of ...
169 views

Elegant transformation of various rules to strings, {f[z_] -> y} becomes “f = @(z) y”

Assume that I have some function for transformation mathematica expressions to strings. For simplicity, just assume it is an identity: ...
793 views

Is there a Mathematica barcode reader?

Is there a Mathematica barcode image reader (much like TextRecognize) that allows the user to enter an image of a barcode and then read it to get an output string?
86 views

Is is possible to use regular expressions in the search and replace diaglog?

I find myself wanting to be able to do regular expression search and replaces in the Mathematica gui over and over again. Using a regex capable editor (such as vim), I could do something like: ...
125 views

Handling of non-file URI

According to the manual, Hyperlink “represents a hyperlink that jumps to the specified URI when clicked”. OneNote produces hyperlinks that begin with onenote://. In Mathematica, creating a hyperlink ...
137 views

Creating a Dynamic MSSQL connection

Hello i am trying to create a notebook that automatically connects to a database on MSSQL server and would then query this to create a sort of personal report. I have connected to this database and ...
108 views

If one picks the menu option Format->Edit Stylesheet and then one opens the "Default.nb" link, the newly opened notebook has a header that reads "Deafult.nb" style definitions. In one navigates down ...
240 views

How do you put a plot inside a popupmenu that is inside another popupmenu?

I have the next code ...
673 views

How to scale Histogram counts with the value of bin center?

I am analyzing some variates from a steeply falling power-law distribution (approximately with a power index -4) using Histogram[data, Automatic, "PDF"] While ...
515 views

Image3D and Graphics3D

also I guess that the topic was tackled in Combining Image3D and Graphics3D. My question is quite similar: How do I match the coordinate Systems of Graphics3D and Image3D? Here some code: ...
357 views

TrueQ - Test of inequality [duplicate]

I want to look if a term is <0,>0 or ==0. What is wrong when I write ...
87 views

What is the syntax to combine conditions and options? [duplicate]

How can a condition and an option be written on the RHS of a function? I.e. ...
222 views

Is there a way to simplify this replacement rule

I have a rather big expression which contains many sums of form q x + w y. I know that y is much smaller than ...
695 views

How to solve system of integral equations

I have two integral equations ...
115 views

136 views

Logic behind Flatten and Append to in Module

I have a list(kicks), and a function(fix). I am aware of the problem using Loop and Append or AppendTo. My question is why does the Flatten produce the desired output. List: ...
388 views

Force Mathematica not to reduce a fraction

I am interested in a function which would stop Mathematica reducing fraction. If my input is 50/100, Mathematica outputs 1/2, I ...
507 views

How to automatically get rid of trig functions in an expression?

I have a large expression containing many terms like this: Sin[1/2 ArcTan[(2 Log[5])/(Log[5]^2 - 2)]] where a trig function is invoked on a rational multiple ...
338 views

Pattern to match L, but not L[_]

I have an expression where I want to replace L but not L[_] For example, the following doesn't work and ...