# Niklas Kurz

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**Content Feed**

Question

Matlab warning when using log

I have quiete a long script basically just consiting of comments for plotting pairs of points and customizing the resulting plo...

8 days ago | 1 answer | 0

### 1

answerQuestion

How to fit a gaussian to unnormalized data

I do know this question has been asked in several kinds plus it's rather a mathematical question for mathstack like sites. But...

20 days ago | 1 answer | 0

### 1

answerQuestion

Does order of multiplication really matter when using simplify ?

I noticed, when I type the following commands: syms x; syms n integer; cn = int(abs(x)*exp(-i*n*x),x,-pi,pi); cnp = ...

2 months ago | 2 answers | 0

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answersQuestion

expand and simplify are not reverse?

I thought any symbolic function that I expand I can simplify getting same results in both direction. But it seems to be just one...

3 months ago | 1 answer | 0

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answerQuestion

How to show axis in 3D

Any time I plot in 3D I get a little confused because of aggravated orientation. The main reason is the missing default visualis...

3 months ago | 1 answer | 0

### 1

answerQuestion

improper integral: exp(ikx) undefined in Matlab?

I wanna integrate: With solution: But Matlab gives NAN: syms x k; assume(k,'integer'); int(exp(1i*k*x),x,-inf,inf)

3 months ago | 1 answer | 0

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answerQuestion

How to fill a volume plot of a vector valued functions (with 3 variables)

Again, I'm ascending new ground, now dealing with volume plots. I'm aware of Matlabs documentary concering this topic. But it do...

4 months ago | 1 answer | 0

### 1

answerQuestion

Filling inside of a plot with color (gradient)

I'm coming back to filling areas with color, trying this time to get the most beautiful result: Here I've got the plain vect...

4 months ago | 1 answer | 0

### 1

answerQuestion

How to include function in legend

I tried all possibl string2functions of Matlab, but not getting quiete the result. Here's my best try: syms x F = x^2; % ...

4 months ago | 2 answers | 0

### 2

answersQuestion

Two different solutions for one differential equation (population model)

I'll try solving the ODE: Substituting Transforming to: Solving I get: Finally, after back substitution: complete so...

4 months ago | 1 answer | 0

### 1

answerQuestion

Error when using variable in axis

I've: syms w we B U A = (w*U)/(sqrt((-w^2+we)^2+(B*w)^2)); syms R L C Aw = subs(A,{B,we},{R/L,1/(L*C)}); fplot(su...

4 months ago | 1 answer | 0

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answerQuestion

How to set Assumptions for function handle?

easy case: I'v gut a function handle: f = @(x,y,z)x.^2+y.^2+z.^2-1; fimplicit3(f) for plotting an implicit function. Now ...

4 months ago | 1 answer | 0

### 1

answerQuestion

Defining a simple function with text/string 'on'

The Idea I'm thinking about really is simple and actually just for getting used to 'functions' My Code is just based on: ax = ...

4 months ago | 1 answer | 0

### 1

answerQuestion

Quiver with color: Add-on

Sadly Matlab didn't enabled color-coded vectors in their ever so neat function quiver Therefore there are endless detours open ...

4 months ago | 1 answer | 0

### 1

answerQuestion

Matlab: differential equation: starting conditions are wrong?

I solved manually: with but if I solve it with Matlab: syms v(t) g alpha m v0; D = diff(v,t) == g - alpha/m*v; ...

5 months ago | 2 answers | 0

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answersQuestion

How to get multiple variables in 'assume' ?

For example If I were to set syms v m g k t real and I want all of them to be handled as variables greater than 0, but not b...

5 months ago | 1 answer | 0

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answerQuestion

Plotting a function with difference between 2 vectors?

I want to plot where is the magnitude of the distance between 2 vectors: : If I would implement this idea in Matlab: [r1,r...

5 months ago | 1 answer | 0

### 1

answerQuestion

Getting the area of a surface integral from Matlab

I'd like to approve my solution of where is the unit sphere Therefore I want to calculate where is the parametrization of t...

5 months ago | 1 answer | 0

### 1

answerQuestion

How to get norm (magnitude) of a vector the simple way?

I just want to get the norm of syms phi the; c = [-cos(phi)*sin(the)^2;-sin(phi)*sin(the)^2; - cos(the)*sin(the)*cos(phi)^2 -...

5 months ago | 1 answer | 0

### 1

answerQuestion

plot simple 2D-surface from 2D-vector valued function

It's really frustrating me that I manage to transfer it into 3D and not 2D. Her'es what I'm talking about: I got a function f:...

5 months ago | 2 answers | 0

### 2

answersQuestion

How to Scale Gradient Field for large z-values?

I want to plot a function R^2 -> R with gradient Field beneath: f2 = @(x,y) 1./sqrt(x.^2+y.^2); [u2,v2] = meshgrid(-1:0.01:1...

5 months ago | 0 answers | 1

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answersQuestion

plot3 with implicit domain

I'd like to plot f(u,v) = (u,v,sqrt(1-u^2-v^2)) whereas u^2+v^2 <1; I thought of using plot3 and defining [u,v] = deal(linsp...

5 months ago | 1 answer | 0

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answerQuestion

Difference between plotting 3D Graphs (Curve vs Area)

I discovered 2 plotting methods that I can't really distinguish: [x] = meshgrid(-1:0.1:1) y = x.^2; z = x; surf(x,y,z)%plot...

5 months ago | 1 answer | 0

### 1

answerQuestion

Simple limit returning NaN: f(x) = exp(-1/x)

By intuition and some opinions on Mathstack the limit of this function should be coming close to 0. However syms x; limit(exp(...

5 months ago | 2 answers | 0

### 2

answersHow to colormap different functions with one gradient?

So I found a sneaky workaround: just bring it in 3D and apply a simple command [u,x] = meshgrid(0:0.01:2*pi); ux = 1+sin(3.*...

8 months ago | 0

Question

How to colormap different functions with one gradient?

So carefully I prepared this piecewise function: u = 0:0.01:2*pi; v = 2*pi:0.01:4*pi; w = 4*pi:0.01:6*pi; f = 1+sin(3*u);...

8 months ago | 1 answer | 0

### 1

answerQuestion

fimplicit3: colormapping (3DContourPlot)

This is totally optional and off pure interest: If I plot a manifold with this powerful function: f = @(x,y,z) x.^2 + y.^2...

8 months ago | 1 answer | 0

### 1

answerQuestion

X label cuts off in logscale

I assume the x numbers are not shown beacause the plot is squeezed too tight. How to fix it? f = 1:0.01:20000; db = zeros(l...

8 months ago | 1 answer | 0

### 1

answerQuestion

loop: stop if value repeats

In my case this is based on N = Number G = Guess x = 1:N R= mod(G^x,N) if R repeats I want the calculation mod(G^x,N...

8 months ago | 2 answers | 0

### 2

answersQuestion

While loop with power.

I'd really be curious to know how to code the statement: , thus finding p until the euqation becomes true. Sounds ...

8 months ago | 1 answer | 0