# All Questions

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: ...
214 views

### Using Findroot within a loop

I am trying to get solution to an equation in a loop. The isolate equation works ...
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. ...
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 ...
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: ...
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: ...
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 ...
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 ...
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 ...
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 ...
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 ...
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
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 ...
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 ...
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: ...
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 ...
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 ...
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: ...
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, ...
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 ...
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 ) ...
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 ...
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: ...
159 views

### How to check a solution of a partial differential equations?

Here is a system which Maple can solve, but Mathematica cannot. ...
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) ...
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 ...
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### 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 ...
47 views

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. ...
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 ...
202 views

### Create Table of replacement rules

I want to create a table of replacement rules. ...
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: ...
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 ...
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'. ...