# All Questions

21 views

### NRoots Results: From Equations to List of Root Values [on hold]

When I use Roots/NRoots, I get a disjunction of conditions as result. The conditions are normally of the type x == value How can I convert this to the list of root values?
11 views

### what is wrong with this plotting code?

Heres the question: The region bounded by f(x) = x+2 and g(x) = sin(x) between x = 0 and x = Pi/2 i. Plot the region on the interval [0,Pi/2], between y = 0 and y = 4. ii. Find the area of the ...
32 views

### Write list of strings to a file (as lines)?

I have a list of Strings, like: list = {"hello", "world", "other line"}; And I want to write it to a file, so that each item in ...
8 views

### Prevent evaluation after ToExpression

How can I produce both typesetting and evaluation of a LaTeX expression? Illustrative example: The evaluation of HoldForm[Sqrt[2.0]] == Sqrt[2.0] looks ok (aside ...
24 views

### Can you help me reduce this? WolframAlpha's search bar has a character limit

Trying to find the pursuit curve for the following illustration: First equation of motion: ...
225 views

### How do I split a list of numbers to monotonic sequences?

Suppose I have: list = {1, 2, 4, 5, 7, 11, 8, 7, 3, 1, -3, -2, 6, 7, 80} And I want to split it to: ...
10 views

### How to replace a local parameter in Module

I want to replace a local parameter in the Module that has assigned local values. I want to replace a single parameter, for example: $x$ that has a value of $5$: ...
15 views

### Change “ListPlot” to 16 bit accuracy?

I have (with the help of this forum) managed to plot a bifurcation diagram with the following code: ...
517 views

### Where can I get detailed information on how the Plot command works?

The command Plot[x^2, {x, -3, 3}, PlotStyle -> Arrowheads[{-.025, .025}]] /.Line -> Arrow produces this output. What I don't understand is what ...
27 views

### Huge difference after changing a fraction to decimal

I have a limit to calculate. With[{p = 1/2, q = 0.1}, Limit[a^q Integrate[Sin[x]/x^p, {x, a, Infinity}], a -> Infinity]] gives correct result ...
210 views

### Extracting RGB color code from a plot

I have let Mathematica to draw a plot of some functions written as below: ...
23 views

### Define a 4d matrix without for loop

I was wondering if there is a way to avoid for loop here: I want to define a 4d matrix H(i,j,k,l), and each entry in the matrix is calculated through a complex function, say Do_H(i,j,k,l), depending ...
15 views

### FindPeaks error “ Expecting an image or graphics instead of”

I'm running Mathematica 10.3.1.0 on windows 7 Professional Sp.1 when I try to use FindPeaks I keep getting the following error, even when trying the example in the ...
59 views

### Why are CoefficientRules and MonomialList so slow?

Why is CoefficientRules so slow in this example (v10.2 on OS X 10.11.4)? ...
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### How to derive natural boundary conditions and governing equations by Mathematica

I can derive governing equations of system by Variational Package of Mathematica but it doesn't give boundary conditions. How can i get them? or is there another way (such as another software) to do ...
15 views

### NDSolve won't stop running

I'm trying to solve the wave equation with NDSolve, but everytime I hit evaluate notebook it won't stop running. Any insights? ...
47 views

### How to make a set of interdependent popup menus work?

Here is my code that is not working. ...
16 views

### Time and distance problem

A train starts from Jammu for Srinagar at 13:30 and reaches Srinagar at 17:30. Another train starts from Srinagar at 15:30 and reaches Jammu at 19:00. At what time will the trains meet?. I have ...
51 views

Using Mathematica 9.0.0.0, I was trying to calculate the sum $$B_n = \sum_{i=1}^n \sin^4\left(\frac{(i-1)}{(n-1)}\cdot\frac{\pi}{2}\right).$$ where I thought it would be $B_n = \frac{3(n-1) + ... 0answers 17 views ### axis label problem I have a contourplot with (Greek) omega on the y-axis and Q^2 (GeV^2) on the x-axis. When I do ... 3answers 223 views ### Partition a disk into regions based on points on a circle I am plotting the roots of a polynomial on the unite circle this way ... 1answer 30 views ### Bar chart scale in multi-chart visualisation This is a rewording of a previous question which probably wasn't very well explained, and so didn't get any responses(!). I'm trying to create a chart which shows the smooth kernel distribution of ... 1answer 28 views ### To embed metadata in a notebook, keeping them both human readable and easily parsable I' m trying to set up a gizmo to manage the large notebooks collection, in my Mathematica workspace. The main idea is to embed indexing metadata in each notebook and manage them by means of function ... 2answers 20 views ### Export to excel or CSV file with column and rows. List manipulation required ... 1answer 60 views ### Mathematica built-in function that translates number strings to numbers I recently ran across a function in mathematica that translates "twenty-two" to 22, but I can not remember what it is and my searching through the help functions has yielded nothing. Can anybody help? ... 0answers 17 views ### EPS Files + Too many points with ListPlot [on hold] So, basically, I have this ... 2answers 29 views ### How to find intersection points of linear and semi-logarithmic plots Hopefully the title depicts what I am trying to do. Below is a figure of my calculations that is shown in logarithmic scale in the x-axis. I am trying to find a way to find the intersection point at ... 1answer 46 views ### How to convert Image3D object into Graphics3D object and vice versa? There are some rendering options (for example, Lighting) which are associated with the Graphics3D objects. I cannot apply these ... 1answer 34 views ### Specify the color of each residue in a protein (PDB)? I'm importing a .pdb file containing a single protein. Mathematica automatically produces a plot of the protein. I want to specify the color of each residue independently, in this plot. Is this ... 0answers 80 views ### Integrate producing bad result I noticed a bug in Mathematica. It computes incorrectly a definite integral ... 1answer 62 views ### How to find roots using the bisection method First I plot the function and then I try to find a domain such that I can see the curve cut through the x-axis. I do this via trial and error ... 2answers 40 views ### Creating a custom ListPlot of consecutive points Here comes some sample data ... 0answers 30 views ### Creating Saveable->False notebooks I'm having difficulties with programmatic creation of non saveable notebooks. ... 0answers 22 views ### Extension of the question “Manipulate Slider Value on the Plot” In the Stack exchange question Manipulate Slider Value on the Plot, the task was to display the value of a parameter. Here was Hector's answer ... 0answers 60 views ### Why are my associations not consistantly followed? [on hold] I'm working on a code that automatically reorders the words of a phrase. I'm getting some inconsistencies with the word "glass". EDIT: Sorry for not simplifying the code to a basic example. Here's a ... 0answers 40 views ### Evaluating interpolating functions embedded in equation [on hold] I have created an interpolating function v(x,y) that contains an interpolation. When called, it returns an equation that contains embedded interpolating functions. ... 3answers 37 views ### Can highlight an expression in mathematica in an expansion? I ask mathematica to make an expansion of some expression. Is there a way to ask mathematica to highlight all terms that, say, goes by x^3 since it is really hard to find them? E.g. ... 4answers 102 views ### Find the length of the intersection of two lists including duplicates I have 2 Lists. The first one includes all the numbers from 1 to 10. listA={1,2,3,4,5,6,7,8,9,10} The second includes ... 1answer 45 views ### Simplify assuming$x$is small [on hold] I would like to assume that$x$is small so that values of the order$x^2$(and higher orders) are negligible. For example, I would like Mathematica to return$1-2m$when I ask it to simplify ... 0answers 29 views ### Is it possible to find the close form solution of following Recurrence relation using Mathematica? Example 1 F(0,t)=t F(n+1,t)=F(n,2*t) Example 2 F(0,y,t)=t F(n+1,y,t)=F(n,y+1,t*y) When I tried to manually solve above ... 1answer 51 views ### Output short denominator as pre-factor How can I make the output print like the input, with the short denominator written as a factor in front of the long expression? I was messing with styles earlier today to do something else, and at ... 2answers 295 views ### Creating a bifurcation diagram of the logistics map I am brand new to Mathematica so please keep that in mind. I've run into trouble trying to make a bifurcation diagram. Here is what I have done: I have a function$f(x)$that relies on a value$r$... 1answer 38 views ### Issues with modeling pulses in a very simple system of DAEs Some time ago I had asked this question about evaluation difficulties using Euler Integration to solve a system of ODE where discrete pulses occur. While I have now abandoned Euler integration and ... 1answer 38 views ### 4-digit number, where$d_{1000} \lt d_{100} \lt d_{10}\lt d_{1}\$ [on hold]

I need to find all 4-digit numbers, where ones-number > tens-number > hundreds-number > thousands-number. 6789 is the highest possible such number and 1234 is the lowest. One solution is to write them ...
41 views

### Is it better to completely forget about the existence of PowersRepresentations?

I noticed that in several cases the performance of PowersRepresentations is hugely worse than that of IntegerPartitions. (Mma ...
35 views

### What is it with MemberQ? [on hold]

Look at this operation MemberQ[x^3, x^3] (* False *) Is it correct, or a bug?
104 views
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### How do I use the third and fourth arguments of Parenthesize?

Parenthesize seems to do a good job with constructing boxes that need to be appropriately parenthesized: ...
26 views

### How to write this iterative sequence function in mathematica

The function is Tx=1-x if x∈[0,1/7) =(x+6)/7 if x∈[1/7,1]. I have to write the iterative sequence for n=0,1,2,3,4,5----- where x_{n+1}= ...