# All Questions

154 views

### Better way to evaluate integral containing Boolean function

I am trying to compute the integral ...
661 views

### Classification of a linear system of equations with a parameter

I need to get every possible value of k that returns infinite number of solutions or no solution to this system: ...
69 views

### Don't understand why Do-loop index is not evaluated in Play expression

So here is some weird behavior: When I create a list inside a loop whose elements are Play functions, with arguments that depend on the counter, it is as if the counter is being stored symbolically, ...
967 views

### PDE problem with initial and boundary conditions

I'm new to mathematica and I don't know what I do wrong, I have written the following PDE problem, with both initial and boundary (four in total) ...
206 views

### Long waiting time for computing a summation

It takes a long time to compute the summation below, and I'd like to know if there are alternative ways to compute things faster. When replacing $15$ by $\infty$, then I should get $3^{1/3}$. I need ...
231 views

### Transform Piecewise[] into sum of indicators

I'm interested in transforming a piecewise defined function into a sum of indicator functions, ultimately with the aim to be better able to integrate them. As an example I would like to transform the ...
1k views

### Continuous wavelet transform with complex Morlet function

The complex Morlet function is defined as: $$Ψ(t,f_c,f_b)= \frac{1}{\sqrt[]{ \pi f_{b} } }\exp(-t^2/f_b)\exp(\jmath 2πf_ct)$$ where $f_b$ and $f_c$ are two important parameters in modifying the ...
304 views

### Do loop - variable does not change [duplicate]

I got the follwing code which should add a '1' 100 times to an empty list. plotVals = {} Do[Append[plotVals, 1], {l, 1, Nmax}]; The output is again an empty ...
1k views

435 views

### Row-Reduced-Echelon-Form with Equation Parameters for Consistent Systems

I often do row-reduced-echelon-form (RREF) calculations that involve parameters using the RowReduce command. Most times, I want to know which parameters make the system consistent. For example: ...
363 views

### Find the value of parameter so that the equation has one solution

Let $(E_l) : x^4-4x^3+x^2(5-l^2)+4 x l^2-4l^2 = 0$ be an equation with $l$ as a parameter and $x$ as an unknown and $S_l$ the set containing all the real solutions of $(E_l)$. Then there is a unique ...
81 views

### Evaluate open cell segments in a notebook

The Evaluate > EvaluateNotebook evaluates the whole notebook. Is it possible to somehow evaluate ONLY the open sections of a notebook?
580 views

### Coloring vertices using GraphPlot

I have the following problem: I used GraphPlot to plot my adjacency matrix. I divided my nodes in three groups: ...
231 views

### Is it possible to interact with an external program's command-line interface?

I am performing a calculation in Mathematica which relies on calls to an external program that acts as a black box for calculating a function $f$, and I would like to know if it is possible for ...
14 views

### Part::partd error on one of two similar lists [duplicate]

I have run into a problem that I can't explain. Here is the code: ...
445 views

### find the number of integral solutions a+b+c+d+e+f = 18 [duplicate]

Find the number of integral solutions of a + b + c + d + e + f = 18 where a, b, c, d, e, f are elements of the range ...
227 views

### How I can make a menu with different graphs with modifiable parameters?

I want a user friendly window in which to have a menu where you can choose the chart you want to display, in which you can move parameters in order to note the width or height of the chart, but I try ...
135 views

### how to load everything when opening a saved notebook

generally, when I carry over work in a notebook from the previous day, I have to physically start from the top and re-evaluate every statement before I can begin from where i left off. Is there any ...