# All Questions

122 views

### Using a variable to tell Mathematica which existing variable to manipulate

I have an estimation routine I have coded up, I want now to do some tests on it where I pick a particular parameter and run the estimation for differing values of that parameter. What I want is to be ...
2k views

### How to plot contours in the faces of a cube

I'm trying to plot contours of a function f[x,y,z] on the faces of a cube as the example below, which represents the domain of this function. Is there a way to do ...
393 views

### How can I draw a hyperboloid given its generatrix?

I want to see how a hyperboloid of revolution is generated by its generatrix, i.e. by rotating one (say the one passing point $(1,0,0)$ and $(0,1,1)$) of the skew lines around another (say the z ...
142 views

### Tooltip in Listplot - Export to PDF

I would like to export a listplot as a PDF document without loosing the tooltip information on the single points. It kind of works with hyperlinks. Nevertheless this workaround is pretty limited and ...
232 views

### Cleaning up InverseLaplaceTransforms in Mathematica

I am attempting to use Mathematica to model an electrical circuit in the s domain. The circuit contains capacitances and and inductances. I've written a series of equations using Kirchoff's laws to ...
152 views

### Why cannot import 3ds file into 3dsmax

The obj file can be imported into max rightly, but when I import the .3ds file into max I get some camera objects. Some 3ds files can be imported into max. What's wrong with the file? Is it ...
70 views

### InputField Insertion Point Movement

I am trying to make the Return Key move the insertion point to the end of the input field's text. Please see the example below for the problem I am facing. Namely, when the return key is pressed, the ...
150 views

### Add a column to a matrix as a function of the other columns

I was wondering if its possible to add a column to a matrix by a formula that uses all other columns, like this: ...
189 views

### Negative Continued Fraction of a Rational

The $n^{\text{th}}$ negative continued fraction convergent $x_n$ of a positive real $x$ is computed by the nested function \begin{align} x_n = k_1 - \frac{1}{k_2 - \frac{1}{k_3 - \dots - ...
230 views

### Simplify and Sqrt, inconsistent behavior?

I have encountered some problems when using Simplify with expressions containing a square root and isolated a following test case ...
171 views

### Assign variable's value programmatically

Not easy to explain what I'm looking for, so please sorry if I'm not so short. Having many variables to be managed in several different combinations, I need to automate the assignment of preset ...
50 views

### “ClosingActions” option for FrontEnd`AttachCell

I'm looking to find the possible values for the ClosingActions options FrontEndAttachCell. I have found ...
335 views

### Full width of graphics in GraphicsColumn

I have a list of graphics which are all the same width, and I would like to combine them into a single Graphics object that has them all stacked on top of each other, column-style, without changing ...
846 views

### Find the number of nonzero elements

How do you find the number of elements in a matrix that are non-zero. For instance, the following matrix has 5 nonzero elements. ...
75 views

### Using the actual subscript as a variable within thecontext of definitions using the Notation package and Symbolize

I've gotten into the habit of using subscripted variables, invoking the Notation package and Symbolize. Now, I'd like to be able ...
472 views

### How to find the vertices of a regular tetrahedron? a dodecahedron?

My question is: how to find the coordinates of the vertices of regular tetrahedron and dodecahedron? I tried to find the coordinates of the vertices of a regular tetrahedron as the solutions of a ...
109 views

### Linearity of a function in Mathematica

I have a function which has something like myFunc[q,a state[c,d]] a could be anything, and I want to tell Mathematica that ...
521 views

### How to solve a stiff nonlinear second-order ode?

I want to solve a nonlinear second order ODE as an initial value problem (IVP). Unfortunately, for certain values of first derivative at starting point I get a stiff-problem. I tried to overtake this ...
219 views

### Performing matrix multiplications with a list

I have a question in regards to PseudoInverse. I have $A$, an $n\times 2$ matrix, and when I want to compute $(A^T A)^{-1}A$, by using ...
172 views

### How can I get the limit of a certain infinite product?

A first look at it suggests the fact the limit is precisely $1$. To check that I tried Mathematica, but no output so far. Most probably it converges very slowly. Is there any way to get the limit? ...