Torsten

Last seen: Today | Aktiv seit 2013

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Extracting values from optimization variable and setting constraints
Defining vectors QTYup and QTYdown as integer vectors with 0<=QTYup(i)<=5 and -5<=QTYdown(i)<=0 (i=1,...,3 for tomatoes, onions ...

33 Minuten vor | 0

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I am trying to form a conditional loop that shows the growth of money, I put in $1000 every year and it grows by 85 for ten years but keep returning one value
money = zeros(10,1); supersaver = 1000; Return = 0.08; money(1) = supersaver*(1+Return); % Money at end of year 1 for i = 2...

etwa 4 Stunden vor | 0

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Getting error while trying to solve boundary condition equations.
For M1 = 0-0.4, bvp4c cannot find a solution. So I started with M1 = 0.5. close all; clear all; clc; K1=0; eta1=0.2; eta2=0....

etwa 9 Stunden vor | 0

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Meijer G-function MATLAB Implementation Problem
Cbar = 1.4361*meijerG([0],[1,1.22,1.72],[0.7200,1.2200,1.4510,1.9510,1.2550,1.7550,0,0],[],331.6059)

etwa 12 Stunden vor | 1

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Where can I learn how to do regression in Matlab
First learn how to approach your problem from the statistical side, then look how to implement this theoretical approach in MATL...

etwa 23 Stunden vor | 0

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Trying to use Newton Raphson Method to solve circuit design
w = 1; T = 2*pi/w; tn = 0:T/40:T; I = 1e-15; Vt = 25.9e-3; Vo = 10; V1 = 6; V2 = 6; R = 50e3; x0 = [0.7;0.7]; e_d = 1...

ein Tag vor | 1

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rror using odearguments @(T,Y)ODE_LR(T,Y,KF_L,KB_1) returns a vector of length 2, but the length of initial conditions vector is 10002. The vector returned by @(T,Y)ODE_LR(T,Y
Use Non_Active_Receptor_concentration0 = 100; Active_Receptor_concentration0 = 0; instead of Non_Active_Receptor_concentrat...

ein Tag vor | 0

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plot the function which is dependent on x, y and z with x, y and z on three axis.
You can plot the function on slices (i.e. 2d-objects (e.g. planes)) through the volume of interest. Of course a full plot over ...

ein Tag vor | 0

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Left and Right side have different elements
Replace t by t(i) in the loop.

2 Tage vor | 0

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Getting integrand error from triple integral code code
f must return a vector of ones of the same size as the inputs x, y or z (which all have the same sizes). Thus replace f = @(x,...

3 Tage vor | 1

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need to compile outputs from for loop into array
In most cases, outputarray = zeros(1,nnz(mod(yeararray,4)==0)) will work.

3 Tage vor | 0

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Error ---> Brace indexing is not supported for variables of this type.
clc clear g = 9.81; L = 0.1; m = 0.5; zeta = 2; x0 = 0.25; v0 = 0; tspan = [0 10]; step_sizes = [0.1, 0.05, 0.025...

3 Tage vor | 0

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error lsqcurvefit for integrate function
Replace % Define the model function (vectorized for efficiency) function y = model(theta, x) k0 = theta(1); E0 = theta(2...

3 Tage vor | 0

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How to set Drichlet and Neumann boundary conditions for a set of ode in BVP solver
Is there a possibility that I can set three boundaries (mix between Drichlet and Neumann boundary) for a set of two ODE's? No....

3 Tage vor | 0

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Trying to determine roots of this polynomial (Det)
k = [1750 -750 0; -750 1250 -500; 0 -500 500]; m = [75 0 0; 0 75 0; 0 0 50]; eig(k,m)

3 Tage vor | 1

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Civil engineering coding problem ( I dont know where the problem in my code is and how to solve it, thanks in advance )
"coord" has only three rows, but you try to access coord(4,1) and coord(4,2) which do not exist (see above).

3 Tage vor | 0

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Why I am getting this error message? How to fix it?
Maybe you mean this function: function v = vec(m) %Helper function to turn a matrix of any size into a column vector using (:)...

3 Tage vor | 1

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How to draw a three-dimensional function image corresponding to the analytic expression of a given piecewise function image
f = @(x,y)(4*y-4*x.*y-2*y.^2).*(y<x).*(x+y<1)+2*(1-x).^2.*(y<x).*(x+y>=1)+(4*y-4*y.^2-2*x.^2).*(y>=x).*(x+y<1)+(2-4*x+4*x.*y-2*y...

3 Tage vor | 0

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Generalized Orr Sommerfield error returned in Eigs Function
I suggest you comment out the command W0 = @(x) lambertw(0,x); like %W0 = @(x) lambertw(0,x); include a function for W0 as ...

4 Tage vor | 0

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How can i solve this problem' when i am running, this message appears: Failure in initial objective function evaluation. FMINUNC cannot continue.
Call your function in which you define the sum of differences squared between real and modelled data for the initial values of y...

4 Tage vor | 1

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hypergeom function, no output
The hypergeometric function has convergence criteria: Converges if p ≤ q and |z| < ∞. Converges if p = q + 1 and |z| < 1. For ...

5 Tage vor | 1

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How to plot a simple wave equation using method of lines?
n = 100; m = 100; tf = 1; dx = 1/n; x = linspace(0,1,n+1)'; tspan = linspace(0,tf,m+1); y0 = [sin(2*pi*x);zeros(n+1,1)]; %[t...

5 Tage vor | 0

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Analytical solution of 1-D transient heat transfer
I'd compare with the solution from "pdepe": m = 1; Ri = 0.05; nd = 20; r = linspace(0,Ri,nd); t = [0 100 600 1800 3600 5000...

6 Tage vor | 0

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Solve Nonlinear ODE Symbolically
This is a nonlinear system of ODEs. An analytical solution with symbolic math is not possible. The only way to solve it is nume...

7 Tage vor | 1

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Triple intergral for the array valued function
N = cell(2,3); N{1,1} =@(x,y,z) x.^2+y.^2+z.^2; N{1,2} =@(x,y,z) x.^2+y.^2+z.^2; N{1,3} =@(x,y,z) x.^2; N{2,1} =@(x,y,z) y....

7 Tage vor | 0

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does "generalized Neumann" boundary condition include actual Neumann boundary condition?
Is there maybe a workaround (like change of variables) to solve these problems? No. All Neumann boundary conditions are related...

7 Tage vor | 0

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Graphing 1D Diffusion in 2 Compartments - Possible Issue with ODE solver
In my opinion, you have the following conditions at the interface x = h_D: (1) D_D*dC_D/dx = D_R*dC_R/dx (2) C_R = phi*C_D (or...

8 Tage vor | 0

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I want to optimize an ODE system of equations with constraints
I ran your code with k in the order of 0.1,1 and 10, but it seems the k-values have amost no influence on the result of the inte...

8 Tage vor | 0

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Solving edge-value problems with unknown intervals
Define a dimensionless variable x' = x/l1 and transform your equation to the form dY/dx' = ... which has to be solved in [0 1]. ...

8 Tage vor | 1

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How to calculate a composite triple integral with exponential function?
Setting l, r and s to zero will cause problems because you divide by these variables. But also changing integral2(@(s,l)array...

8 Tage vor | 0

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