# All Questions

39 views

### Resizing text with keyboard shortcuts in Mathematica 10

In Mathematica 10, it seems that the Alt+= and Alt+- shortcuts affect the entire cell instead of only the selected text. In the following example, I highlighted "line 2" and pressed Alt+= several ...
207 views

### Solving a System/Matrix of Equations in Matrix Form

Ok, I am trying to solve an equation involving matrices (well, tensors actually), which is of the form: $\mathbf{e}^{T} \cdot \mathbf{M} \cdot \mathbf{e}$ = $\mathbf{N}$, where $\mathbf{e}$ is an ...
184 views

### Inferring interest rate of a loan from payment

Be patient with me since this is my first post here. I don't know how to use the Math notation. I wish to compute the interest rate for an existing loan given the original loan amount, length of ...
433 views

### Is there a neat way to generate the odd set constraints matrix?

Given a undirected graph $G=(V,E)$, I am trying to generate a related matrix $M$, where columns are indexed by $E(G)$ and rows are indexed by all odd subsets of $V(G)$. I can finish this task using ...
287 views

### Sentiment analysis of tweets

I want to use Mathematica for a sentiment analysis on tweet-messages. For that purpose i selected several tweets. Each tweet is interpreted by myself as positive (pos) of negative (neg). For example: ...
432 views

### Plot: Show specific values in y axis

I need to plot a list of points and I am using ListLinePlot. Mathematica decides which values on the y axis are labeled. How can I show labels for the exact y ...
291 views

### Using NDSolve to solve a PDE with a Dirac Delta function

I'm trying to solve the following equation (in Mathematica 10): ...
176 views

### Convert matrix rows into variables

Can anyone show me how to set all matrix rows to variables. For example, I have matrix w={{1,2,3},{3,2,1},{0,0,0}} and I need to set each matrix row to be separate ...
418 views

### Mathematica exported movie quality

I am generating an animation using: anim = ListPlot[X]; Export["anim.mov", anim, ImageResolution -> 800, Antialiasing -> True]; The ...
191 views

### Multiple animation in Mathematica

I have the following in Mathematica: ...
135 views

### Plotting a solution of DSolve

I am trying to plot a solution of a differential equation system. This is what I have: ...
108 views

### Mathematica doesn't know the answer to this differential equation system

I am having some trouble with solving a somewhat heavy differential equation system, which is consisted of 10 variables and other abstract parameters as follows: ...
49 views

### Where can I permanently modify Directory[]?

First I set SetDirectory["F:\\learning_mma"];Directory[](*ok,success*) and then I quite the kernel: Quit[] an then ...
63 views

### How to right adjust the output of a print statement

Suppose i want to print numbers in a loop/table For[n = 1, n < 31, n++, Print[BaseForm[n ,7]]] the output comes with numbers left adjusted. How Can I make them right adjusted?
133 views

### Disable cache and pop up

I have a nb file that I have been editing frequently in M 10, but no matter how many times I modify the file or edit the file in M 10 it doesn't seem to update its cache. Everytime I open the file I ...
281 views

### Mathematica Plot and Movie Problem

I have imported two .mat files from Matlab. One containing the x coordinates and another y of a curve at different instants. So the .mat files are matrix and each row belongs to coordinates at a given ...
38 views

### x86_64 Linux: plotting feature [duplicate]

Some features with V10.0.1.0 plotting under x86_64 Linux (xubuntu 12.04 & 14.04). I use ListPlot, but I also see this using other Plot functions. Generate some data: ...
107 views

### LegendMarkerSize value equivalent to special character size in LegendMarkers

I am trying to find the equivalent LegendMarkerSize value to the size specified for special characters when using LegendMarkers. So far I found LegendMarkerSize 14 generates symbols close to 22 set ...
164 views

### How to Plot a Series

I would like to plot f1[x_, n_] := Sum[Sin[(2 j - 1) x]/(2 j - 1), {j, 1, n}] on a single plot containing f1(x,50), f1(x,100), f1(x,1000), with three different ...
248 views

### Generate Matlab figure

I am currently working on a project. Because of lack of communication between my team mates and I, I did most of the work (and the graphical figures) in mathematica. Now, I have to pass all the ...
80 views

### Building up functions from data

Have a tricky Mathematica problem. I am trying to build up functions from data to automate my processes with a minimum of hardcoding. So let's say I have some data: ...
108 views

### Get all variables in an expression with Variables[]

"\[Phi]" <> "1"; Variables[%] Exp["\[Phi]" <> "1"]; Variables[%] Exp[Subscript[\[Phi], 1]]; Variables[%] Say I have lots of variables used for ...
109 views

### Outputting numbers symbolically

Suppose I want Mathematica to output Table[2^n, {n, 1, 5}] Mathematica gives {2, 4, 8, 16, 32} but how can I get ...
445 views

### Is there any way to assign multiple values?

I am looking for something like "byref" assignment in programming languages. Let's assume I have: x1=x2=....=xn if I want to change their values ( say to 3 ) I need to set all of them like: ...
285 views

### How to update bundled SQLite library (or driver?) in V10 for OS X

I've been using undocumented Database functions with Mathematica V9 to acces my SQLite database, which is a Firefox-generated database that contains cookies. ...
214 views

### Send message to Facebook into a secret group (not on user's wall)

Does someone know if Mathematica 10 allows to send messages to Facebook but not on the user's wall rather to a secret or closed group? I have an small application that reads some data from a web site ...
134 views

### Code for time derivative or time differential equation

I have three variables $X, Y, Z$ whose functional form is the following (I also have a function for $Z$ which is somewhat complicated but is not essential for my question here; so it is omitted.): ...
119 views

I have a notebook which has a lot of generated data (which I would rather not regenerate), and the kernel is dead. So, the question is, how do I recover the data in the notebook (I know it is there, ...
36 views

### Strange style conversion indicator appeared when type “a Pre”

I got the following strange style conversion indicator when I was typing a Pre(character a and ...
142 views

### Where can I put my conditions?

I just learned in this answer that you can put conditions inside a With and thus use computed values in them, like this: ...
223 views

### Find maxima and minima of data like {time,value}

I have a list of time and values of the charge and discharge of a capacitor, and i want to separate in two list of {time,value of charge} , {time, value of discharge} I know there is a lot of the ...
476 views

### Calendar view outline

How to compute the outline of a calendar month like this D3 example. (D3 is a functional language built on JavaScript developed at Stanford and used by New York Times to deploy interactive ...
120 views

### Limited Opacity Levels in Image3D?

I'm trying to render a simple spherical distribution where the opacity varies with radius using Image3D. Unfortunately, the outcome is not very appealing, with ...
121 views

### Combine ImplicitRegion

I have a starting and a target set which I would like to represent via ImplicitRegion. I can evolve each point p of the starting ...
312 views

### Recursive partitioning: Is there a better way to do this?

Consider the following function, which recursively splits a list into equal length sublists (the length of the list is assumed to be a power of the second argument): ...
826 views

### Plotting 3D Vector Field in one plane

I want to plot a vector field F={Fx, Fy, Fz}. However, I only want to plot it in one plane (say, z=0). When I use ...
274 views

### How to simplify symbolic matrix multiplication using the associativity of scalar multiplication?

My input is (2A).(3B). Is there a way to get 6A.B? All I could get back from Mathematica was ...
59 views

### Retain or delete parts of textstring in tweets

For a twitter analysis I collected many tweets. For example: ...
102 views

### How a novice user better understand the Q/A [duplicate]

A novice user reading Q/A here: I sometime need to just understand the syntax and meaning of commands exampled here. where is the best place to find it?
229 views

### My Baum-Welch algorithm is very slow. Is it due to Mathematica?

I've also posted this question here, since I'm not sure which community is more adequate for this type of question. I've programmed imperatively the Baum-Welch algorithm for a 2 state hidden Markov ...
923 views

### Spherical parametric plot

How can I plot such a parametrized curve: $r = 2\cos t + \sin t$ $\theta = t$ $\phi = \sin 10t$ where $0<t<\pi/2$. In the documentation only has been discussed parametric plot in Cartesian ...
1k views

### Why PlotStyle->Dashed make everything dashed?

Bug introduced in 10.0.1 and fixed in 10.0.2 -- appears to affect Linux only. It has been really strange for me. I am not sure it's regression after v10.0.1, or something went wrong with my system. ...
115 views

### Changing default behavior of Series to give slightly different SeriesData

I am working with complicated expressions expr that contains the symbolic function f[x] which I know to have a pole at ...
703 views

### How can one get rid of the “Template notebook” bar in Mathematica?

Alright, maybe I'm just really stupid. But I tried my damnedest to get rid of this stupid toolbar. I checked every menu and searched google for a solid 20 minutes. Eventually, I just copied the code ...
1k views

### How to deal with recursion formula in Mathematica?

In engineering problems, I am always seeing many recursion formula. For instance, In the book "The NURBS book", I discovered many recursion formula Fibonacci ...
493 views

### Add text after label in a Manipulate graphic

I can add the value of a slider to the right of it using the Appearance-->Labelled option, but what if I want to add text after the automatic label. How can I do that? Normally I want to do this to ...
209 views

### Definite Integral over Bessel Function

Hello I am interested in evaluating the following integral. ...
159 views

### Controlling PointSize in a RegionPlot

I have a "named" point in Mathematica 10 and am plotting it like this using RegionPlot: ...