# All Questions

33 views

### Store results of inequality

I eveluated some values using Reduce commend and I store them in a Table ...
93 views

### Manually adjust graph vertex location by dragging?

Is there any way to manually adjust graph vertex location by dragging? Sometimes I have a graph and I want to make tweaks to the vertex locations. If I double click to edit I can move around the ...
64 views

### How to keep $FrontEnd options from resetting? I'm trying to get Mathematica to look in a different, version-tracked folder for the 'TextResources' files that it uses to build the Front End. I've prepended my version-tracked folder path to the ... 1answer 71 views ### calculating a sequence of functions using iteration I am trying to compute a sequence of functions using iteration and keep running into problems trying to use built in looping commands because of the recursive nature of the definition. The code below ... 0answers 32 views ### Using Rosenbrock's function to find the minimum of another function? [on hold] Using Rosenbrock function : clc; clear all; a=(-2:0.01:2); b=(-1:0.01:3); for x=1:401 for y=1:401 z(x,y)=(1-a(x))^2+100*(b(y)-a(x)^2)^2; end end %disp(z); mesh(z); n=401; % ... 2answers 125 views ### Manipulation of InterpolatingFunction Suppose that$q[t]$is obtained by NDSolve as an InterpolatingFunction, and I want to define$Q[t]$to be some function of ... 0answers 21 views ### No Symbols Matching$InterfaceEnvironment

I'm running a webMathematica server (running Mathematica 9) and am getting some weird stuff in the log - specifically, I keep getting the following message: ...
95 views

### Can anyone help to solve this set of coupled ODE? [on hold]

After some time Mathematica just give me the same thing while I was trying to solve: DSolve[{3 E^(-[Lambda]2 [Phi]0) r a[r] - 1/2 [Lambda]1 [Phi][r] + 3/8 E^(-[Lambda]2 [Phi]0) [Lambda]1 ...
44 views

### Vertex labels versus vertex names in VertexRenderingFunction

The VertexRenderingFunction seems to only use names, not labels. For example: ...
44 views

### Solve linear equations containing complex numbers? [on hold]

The 2 equations are $$xi+y=0$$ $$-x+yi=0$$ where $$i=\sqrt{-1}$$ I am getting $$0=0$$ Any help? Thanks!
531 views

### How to partition a list in a specific way

I have a list: a = {{1, 2, 3, 4, 1, 2, 3, 4}, {5, 6, 7, 8, 5, 6, 7, 8}}; Using Partition and ...
76 views

### Solving problems with the floor function

I've got the following problem: If I want to calculate the following equation, ...
102 views

### Plotting double inequality only for integer values

RegionPlot is plotting for all values. And using ListPlot I can only evaluate one inequality. How can I plot this type of ...
46 views

### Backtrack function

I am using Mathematica 9. In the Help help file is the built-in function Backtrack. In order to use it the Help file says: To use Backtrack, you first need to load the Combinatorica Package using ...
75 views

### Open an html saved notebook

I have found an html page clearly created using the Save as HTML option of Mathematica. Is ...
78 views

### Function derivatives in arbitrary dimension

I have a higher dimensional function: $$f(x,t)=-\ln(t)-\ln(1-\left\|x\right\|^2-t^2)$$ where $x\in\mathbb{R}^n,~t\in\mathbb{R}$. I want to compute the derivatives with the commands ...
48 views

### Finding relations between polynomials

Suppose I have a multivariate polynomial ring $A=\mathbb{R}[x_1,\ldots,x_n]$ and a set of $S=\{p_1, \ldots,p_k\}$ polynomials in $A$. Using this code (which works great) Dimension of an algebraic ...
88 views

### speed up for computing MatrixExp

My code use two method to computing MatrixExp, I expected the second snippet code will faster than the first one, but in fact it a bit slower than that. How can I ...
51 views

### How to save all variables in the workspace into a file? [duplicate]

I did some time consuming computation and obtained a lot of arrays and variables; however after restart the Mathematica Kernel, all these computational results disappeared. How can I save all these ...
18 views

### Real-Life Application Linear Equation [migrated]

Robot Moe is assembling memory cards for computers. At 9:00 am, 52 cards had been assembled. At 11:00 am, a total of 98 had been made. Assuming the production rate is linear. a. Find the slope of ...
58 views

### Combining Two Manipulated Plots Dependent on Same Variables

I need to combine two plots on the same graph to highlight the intersection of the two while being able to manipulate various parameters that are common to both functions. I need to have the slider ...
41 views

### Object depth different in replacement rule

I access the first part of an expression with head foo without a problem: foo[arg][[1]] arg Then when I try to use this ...
96 views

169 views

### Unexpected dots from Line

I have noticed cases where Line produces dots in a graphics object when I think it shouldn't. The first of these is: ...
I am trying to find the eigenvalue/eigenfunction solution to: $$\tag 1 y''+3y + \lambda y=0 ; y'(0)=0, y'(\pi)=0$$ I used DSolve and Reduce and they seem to converge, however (embarrassingly) I am ...