Torsten

Last seen: Today | Active since 2013

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How to avoid the warnings on my code
%--- Solving the diff. eqn. y'(t) = y(t) - c*y^2(t) with c = 0.5 using %--- Euler's method, Runge - Kutta method, and predictor...

ongeveer 3 uur ago | 1

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I am new to using Matlab, and wanted to ask if there is a way to group datapoints into bins/columns by numerical range? Thanks
https://uk.mathworks.com/help/matlab/ref/double.discretize.html https://uk.mathworks.com/help/matlab/ref/matlab.graphics.chart....

3 dagen ago | 0

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Plugging a new value to ksdensity
rng("default") r = randn(100,1); x_new = 1.1; f = ksdensity(r,x_new) or rng("default") r = randn(100,1); f = @(x)ksdensit...

3 dagen ago | 0

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which software better to learn?
If you ask this in a MATLAB forum, you will get a different answer than in a python forum :-) If you start learning about optim...

3 dagen ago | 1

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Hello everyone, I have a question about numerical integration. The formula is shown below, where the integration path C_beta is a closed curve on the complex plane.
However, as mentioned in my question, the array list_beta forms a closed curve on the complex plane. Isn't then dq = q' dbeta a...

5 dagen ago | 0

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graph is not showing
P=1; % assuming and constant Ex=20*10^4; Ey=2*10^4; Ea=0.1*10^4; k=0.1; t=0.01; b=0.05; h=0.1; ExGxy=17; Ah=((Ex/Ey)^0....

9 dagen ago | 0

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Diffusion equation in Cartesian and Cylindrical coordinates
If m = 1, the condition at r = 0 set by "pdepe" is pl = 0, ql = 1. All other conditions make no sense mathematically because the...

11 dagen ago | 0

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"Too Many Input/Output Arguments" error for nrlmsise00 function
The results for the defined testcase seem to coincide with what is stated in the Documentation (see below). You will have to ad...

12 dagen ago | 1

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Weighted regression without priority zone, but with finding the minimum possible value for all the differences
x = [1 2 3 4 5 10 20 50].'; y = [5 10 15 20 25 30 40 50 60 90]; z = [265.110074796797 195.008035083193 156.258229529605 129.74...

13 dagen ago | 1

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Code Matlab for a function that depends in a real parameter
integrand = @(f,y)y.*sin(f(y)); F_alpha = @(f,alpha,x)alpha.*x.*integral(@(y)integrand(f,y),0,1); f = @(u)u.^2; alpha = 1; x...

13 dagen ago | 0

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Weighted regression without priority zone, but with finding the minimum possible value for all the differences
Use "fminimax". It minimizes the maximum error and is the nonlinear equivalent to minimizing the Inf-norm in linear regression p...

14 dagen ago | 2

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Why am I getting error using assignin and syms while solving pde using pdepe
Here is the code for the dimensional model. It should be no problem to rewrite it in the non-dimensional form. Note that the s...

14 dagen ago | 0

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Why am I getting error using assignin and syms while solving pde using pdepe
tau is a vector of values in your code: tau = linspace(0, tau_end, 100); % Non-dimensional time You can't use it as a symbolic...

15 dagen ago | 0

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Andrica's Conjecture
Use nthprime(1:n+1) to generate the vector of the first n+1 prime numbers. The rest should be simple.

15 dagen ago | 0

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Forward, Reverse finite difference question
x = 0:0.1:1; f = @(x)x.^2; derf = (f(x(2:end))-f(x(1:end-1)))/0.1; hold on plot(x(2:end),derf); % backward plot(x(1:end-...

15 dagen ago | 1

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Time interation error while trying to solve a partial differential equation which describes pore diffusion resistance combined with with surface kinetics.
One error, one problem: The error: qr = De; must be replaced by qr = 1; because the boundary condition is given by p+q*f =...

16 dagen ago | 0

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Numerical differentiation and integration
t = [0,5:10:115]; s = [0, 4892.3, 14041.3, 22371.3, 29926.1, 36764.4, 42965.4, 48634.8, 53910.3, 58961.8, 63981.6, 69165.5, 74...

18 dagen ago | 0

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error in runge kutta -Unable to perform assignment because the left and right sides have a different number of elements.
You always have to use the variables at the ith time step, not the complete array in the assignments. I didn't check your compl...

18 dagen ago | 0

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How to plot the temperature unit which is small circle raised at the left of C upper case?
Maybe by adding the interpreter ? In R2024b, your title is correctly plotted without any modifications. x=0:0.1:1; y=x.^2; pl...

19 dagen ago | 0

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The method of how to calculate the FWHM.
xmax = 0; ymax = 4; x = xmax:0.01:3; f = -x.^2 + ymax; FWHM = 2*interp1(f,x,ymax/2) Or directly use the inverse function of...

19 dagen ago | 0

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How to make my code run faster
Maybe your system does not have a solution. sol = fsolve(@fun,[1 1 0.1]); fun(sol) sol = 1./sol function equations = fun(par...

19 dagen ago | 0

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Finding more than one root for nonlinear equation
Equations (5) and (6) are two linear equations in q_t, beta and q_dot_b. Use them to express q_t and beta as linear functions o...

20 dagen ago | 0

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How would I Solve this System of Trigonometric Equations for Inverse Kinematics?
Solve eqn2 for t1 Insert the result for t1 in eqn1 and solve for t2 Insert the result for t2 in eqn3 and solve for d1

21 dagen ago | 0

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How to convert a fourth-order ordinary differential equation into a system of first-order ordinary differential equations in order to solve it.
If all conditions are given at x = 0, it's an easy problem: Define z(x) = integral_{x'=0}^{x'=x} d*sqrt(1+y'(x')^2) dx' The ...

22 dagen ago | 1

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How can I correctly implement this Meijer G-function in MATLAB for the given equation with specific parameters ?
a,b,gamma,y1 and y2 are given as numerical values ? Then use a = ...; b = ...; ggamma = ...; y1 = ...; y2 = ...; a1 = -y1...

25 dagen ago | 0

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How to solve a five equations systems to get the five unknown
Directly use the five experimental values (T_exp,theta) as numerical data and "lsqcurvefit" or "fmincon" to solve for the five u...

25 dagen ago | 0

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piece wise function for thermal properties in PDE solver
When creating the geometry for your problem, I'd already take into account these two spatial regions where the different thermal...

26 dagen ago | 0

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Netwon algorithm with backtracking is failing
rng('default') n = 2; m = 20; c = sym('c',[n 1]); A = sym('A',[m n]); b = sym('b',[m 1]); x = sym('x',[n 1]); f = c.'*x - ...

26 dagen ago | 0

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Averaging specified number of points around the minimum value
data(ix-5:ix-1) are the 5 points left to the minimum, data(ix+1:ix+5) are the five points right to the minimum. So the code sho...

27 dagen ago | 1

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Can anyone help me to run this coding?
OdeBVP returns NaN for ff(3) at the start (see above). You will have to find out the reason (initial values for y, x, parameters...

27 dagen ago | 0

Torsten

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