2
votes
3answers
898 views

How do I plot two Gaussians/normal distributions with 2 different means and 2 different standard deviations?

This is probably very easy for someone with more experience, but I am trying to plot only two Normal distributions, but for some reason my Method plots 4, instead of 2. I have: ...
0
votes
1answer
214 views

Using Findroot within a loop

I am trying to get solution to an equation in a loop. The isolate equation works ...
1
vote
1answer
41 views

Multiplicate in an Integration with time [closed]

I am calculating the area of a step response. I try to use this Integral Criterion for my Calculation. The time t is multiplicated with the control error xd raised to the second power. ...
25
votes
1answer
1k views

May the Fourth be with you

Happy Star Wars day. I was playing around with the image manipulation functions in Mathematica in an attempt to recreate the Star Wars crawl. There's an HTML/CSS implementation which is in my ...
4
votes
1answer
180 views

DynamicModule inconsistent behavior; was: DynamicModule persistent UI changes

Update: I'll restate the question in hopefully more terse and clearer terms. To illustrate the issue, run this and save the resulting notebook: ...
1
vote
2answers
244 views

How to run function every x seconds?

I want to make a Graphics with a Disk whose position should update every 4 seconds. This is what I've got so far: ...
1
vote
1answer
119 views

How to expand function $\cos(y+i\log{x})$ in powers of $x$?

I have the following, probably very simple question. How can I get $\it{Mathematica}$ to power expand function $\cos(y+i \log(x))$ in powers of $x$? This function obeys a well defined Laurent ...
4
votes
1answer
128 views

Example from Mathematica documentation (ExtremeValueDistribution) seems to be evualting “forever”

I am referring to this example at the reference page for the extreme value distribution: http://reference.wolfram.com/mathematica/ref/ExtremeValueDistribution.html#6764486 The first three commands ...
1
vote
1answer
150 views

Speeding up a function

This is un updated version of a previous (now deleted) post of mine. I need to marginalize a distribution. I was suggested to use the code in this thread. This works just fine, but the problem is ...
3
votes
2answers
217 views

Any hidden keyboard shortcut for RightTeeArrow?

The Basic Math Assistant palette does not show a keyboard shortcut for RightTeeArrow. Is there some hidden key combination that results in the output? (Just hoping to be able to avoid having to ...
3
votes
3answers
179 views

StringCases using RegularExpression fails when there is missing data

I got some text scraps with this structure "Focal Plane: 198' Active Aid to Navigation: Yes *Latitude: 35.250 N *Longitude: -75.529 W" But some of them lack ...
1
vote
1answer
102 views

Importing adjacency matrix from file of 0/1 arrays

Is it possible to import adjacency matrix for graph representation, from simple text file with NxN (rows x columns) of 0s/1s: 0 1 0 0 1 0 1 1 0 1 0 0 0 1 0 0
2
votes
2answers
419 views

List density plot for non-uniform data

I am trying to make a density plot to show the data that can found here. I tried with GNUplot previously. The result of GNUplot density plot for a rectangular set of data. I am able to do this only ...
2
votes
3answers
233 views

Why does Dynamic for PlotRange in ListLinePlot prevent the proper range from being used?

I am using Manipulate to simulate Brownian motion. I want to be able to zoom in. Thus, I want to use Dynamic for the ...
1
vote
1answer
129 views

What is wrong with setting one list to another within function? [duplicate]

I have built a function which carries out a set of operations given two parameters. The function looks as follows: ...
4
votes
1answer
87 views

Is it possible to Print into a collapsable CellGroup?

During rather long computation I have intermediate steps Printed with useful information which should be collected for possible use in future inside of the ...
0
votes
1answer
71 views

how to superimpose two best-fit graphs [closed]

I have a couple of best fit curves. All I want to do is superimpose them, to see if they are shaped differently. (I can eyeball them but I want to be sure, as it were). On to what I am asking: I ...
3
votes
1answer
214 views

Are there any more time-efficient ways to solve a matrix equation than with SparseArray and LinearSolve?

I am trying to solve a matrix equation, with the matrix being tridiagonal. The problem I am having is that a message keeps appearing that I don't have enough memory. Here is the code: ...
3
votes
1answer
293 views

How to efficiently drag points on a curve within a Manipulate

My intention is to demonstrate on any conic various metrics properties on points belonging to the conic and connected by lines. I want the points to be dynamically moved not the usual way, ...
5
votes
1answer
131 views

Behavior of 1.2 ∈ Rationals changes in v9?

A friend of mine using version 9 recently showed me this: It's strange because in version 8.0.4 1.2 ∈ Rationals does return ...
2
votes
2answers
477 views

How to make lines in Plot Legends wider?

1.- How to put DASHED lines in the Legend? 2.- How to give Style to {20,Bold} to all "Expressions in Legend? (I use LegendMarkSize for make lines wider than default fine style ) ...
1
vote
1answer
500 views

How to find non zero elements of a list containing zeros and symbols

I have a list, obtained after differentiating a list of expressions, which contains zeros and symbols, say: A = {x1^2, x2^2, x3^2, x4^2} D[A,x3] results in the ...
4
votes
1answer
109 views

Converting string representation of boxes into explicit boxes

It is very easy and convenient to write textual labels as Strings in the WYSIWYG mode. For example, I define a short form describing a linear model: ...
1
vote
1answer
159 views

How to check a solution of a partial differential equations?

Here is a system which Maple can solve, but Mathematica cannot. ...
15
votes
4answers
2k views

Elegant solution to the Zebra [logic] Puzzle (“Einstein's Riddle”)

The famous Zebra Puzzle (Wikipedia), often called "Einstein's Riddle," is a logic puzzle that can be solved deductively by applying a list of logical rules. One version of the riddle (from Wikipedia) ...
1
vote
1answer
108 views

Why don't I get the graphics output I'm expecting? [closed]

Today,I want to use a point generate a circle,the main picture as below: Given that I know the equation of circle, and the value of $L_1$,$L_2$.The coordinate of point $A$ is $(p_x,p_y)$. I use ...
1
vote
1answer
122 views

What is the inside?

What is the inside of the Mathematica command, solve, for a system of equations like the following? $$\eqalign{ (x +2\phantom{3} z)^2 + (y +\phantom{3} w)^2 &= 52\cr (x + 30z)^2 + (y + 3w)^2 ...
2
votes
0answers
251 views

Travel time sweet spot using: Mathematica and Google Maps API

I want to use Mathematica to do some time minimisation calculations calling on Google Maps API for travel time data. I'm concerned with travel time, e.g. along roads (by car or walk) and not linear ...
3
votes
1answer
171 views

Zooming into animated plot

Let's say I have the following animation: Animate[ParametricPlot[{Cos[a t], Sin[a t]}, {t, 0, 1}], {a, 0, 2Pi}, AnimationRate -> 0.1] Is there a way to ...
3
votes
2answers
563 views

Symbolically solve a system of coupled second order differential equations

I have posted a similar question in another forum where the general consensus seems to suggest that it is not possible to symbolic solve a system of coupled second order differential equations with ...
2
votes
1answer
213 views

How to calculate a double indefinite integral [closed]

I need to calculate double integral as shown below. I used the Classroom Assistant palette to write the integral. How can I enter it as ordinary text, i.e., ...
2
votes
1answer
238 views

Prove (or check) an expression is positive given constraints on variables?

I'm trying to figure out whether an expression is always positive given positive parameters. When the expression is complicated, I can't do this by eye. Is there any way to make Mathematica prove ...
0
votes
1answer
404 views

Parallel computation of NDSolve and a problem

I used this code to solve a system of differential equations: ...
4
votes
1answer
150 views

SmoothHistogram with sharp boundary [duplicate]

When using SmoothHistogram (to plot probability distribution function), I noticed that the edge of the figure is automatically smoothed towards zero probability. ...
2
votes
5answers
277 views

Returning all positions for all different occurences of elements in a list

Is there way to construct oneliner as pure function(s), so that I enter mylist only on one place - on the end of line. And that function return the same result as ...
1
vote
4answers
137 views

How to count number of {True,True} outputs?

Do[Print[{x + y + z == 3, x + y > z}], {x, 1, 2, 1}, {y, 1, 2, 1}, {z, 1, 2, 1}] If I run this syntax I get a series of Outputs, I am trying to Count only the ...
5
votes
2answers
378 views

Labeling a grid

I have m = {{0, -1, -2, -3, -4}, {1, 0, -1, -2, -3}, {2, 1, 0, -1, -2}, {3, 2, 1, 0, -1}, {4, 3, 2, 1, 0}}; And a grid ...
1
vote
1answer
102 views

How to study the sign of an expression including a function, with conditions on the function?

I'm trying to study the sign of an expression, having information on some of my parameters. I don't know how to code these conditions. For example, I want to know when this expression: ...
3
votes
3answers
380 views

How to exchange two arguments?

Recently, I have being using Mathematica to write my undergraduate paper. I want to use two pattern lists such as { A -> a, B -> b, c -> C, ....} and ...
0
votes
0answers
24 views

How to put the values/points in a loop into a plot? [duplicate]

I've already make the do loop..it has 200 points..how am i going to put those points into a plot?do i need to make a list@table before doing the plot?here's my loop example, ...
0
votes
0answers
63 views

Polar Plotting in Complex Plane [duplicate]

How would I plot the following functions in the polar complex plane? $$ \phi={-k\over 2\pi r}cos(\theta_0-\theta) $$ and $$ \psi={-k\over 2\pi r}sin(\theta_0-\theta) $$ Please ...
0
votes
0answers
18 views

Using functions as input for a function - won't simplify [duplicate]

I've defined a function P[k_] := 1/[Sqrt]2 (R[k] + L[k]) where R and L generate matrices. However the output of this function never full simplifies (even when I use the Simplify[%] functions). It ...
0
votes
0answers
47 views

Problem with loading my custom package [duplicate]

I've been having quite a bit of trouble loading a package I wrote. I've followed the suggestions on related questions on this site, as well as on Mathematica's own pages, and still nothing has worked. ...
1
vote
0answers
68 views

Cells overwritten as “Null” [closed]

Last week an entire section of a notebook was overwritten(?) such that all cells (headers, text, inputs, and outputs) were merely Null. It was in a section of the ...
2
votes
2answers
202 views

Create Table of replacement rules

I want to create a table of replacement rules. ...
4
votes
1answer
202 views

How to change a parameter dynamically inside NDSolve

I have no idea how to dynamically update a parameter inside NDSolve. For example consider following first-order DE: ...
12
votes
3answers
371 views

Disentangling the data

An experiment yields a functional dependence on two variables $F(x,y)$, can be imagined as a 2D map. It is known that the function can be factored as follows $F(x,y)=fx(x) gy(y) +gx(x) fy(y)$. Given ...
1
vote
0answers
101 views

Trying to study the three points theorem of the Mobius Transformation

I am trying to study the three points theorem of the Mobius transformation. This theorem says that the Mobius transformation $M$ maps three distinct points p, q, r to three distinct points p', q', r'. ...
3
votes
1answer
126 views

How to simulate the 1-D motion of a particle under constant acceleration? [duplicate]

I am trying to represent the position of an object under freefall, but am completely lost. Here is my attempt so far: ...

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