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# Questions tagged [code]

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39 views

### How to find the distances between two adjacent maxima in a solution from NDSolve

I try to find a general approach to plot the time evolution of horizontal distances from maximum to maximum in a solution of PDE. The solution u[x,t] normally have ...
220 views

### Writing a program that will filter the integer solutions

I've the following equation: b==(-12 + Sqrt Sqrt[ 3 (-4 + r)^2 + 12 a^2 (-2 + r) - 4 a (-5 + r) (-2 + r) + 4 a^3 (-2 + r)^2] + 3 r)/(6 (-2 + r)) ...
75 views

### Why is my version of Euler's Method not working?

I am creating Euler's method for $\frac{dw}{dt}=(3-w)(w+1)$ for $\Delta t=0.5$ from $0\le t \le 3$. I tried the following. ...
36 views

### Finding the 3D-model of a function that is rotated around the x-axis

How can I find the 3D model that is created by revolving the function: ...
67 views

### Find the number of true's in a TrueQ expression

How can I find how many times the code: Table[TrueQ[FractionalPart[Sqrt[n]] == 0], {n, 1, m, 1}] Gives the value True back for a variable $m$? So, we know that ...
59 views

### Cantor type iterations in Mathematica

I am trying to draw the iterations of the IFS in which from an interval middle third is removed and in the resulting figure left line is shifted 1/6th to the right and right line is shifted 1/6th to ...
72 views

### Design Patterns for System Functions?

Using PrintDefinitions give one a great view into many system functions. Often the design of these symbols incorporate multiple patterns that I see again and again. ...