Torsten
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Content Feed
Any availiable function to find the Taylor series of multi variables function in Matlab?
https://uk.mathworks.com/matlabcentral/answers/92764-how-do-i-generate-the-taylor-series-as-a-function-of-several-variables-in-m...
17 hours ago | 0
| accepted
I need help displaying the eigenvalue after each iteration
A = rand(10); ATA = A'*A; x0 = rand(10,1); for iter = 1:10 y = ATA*x0; x = y/norm(y); x0 = x; y end lar...
22 hours ago | 0
Solving 4 nonlinear equation for 4 unknowns numerical - doesn't find an answer [0×1 sym]
Try S = vpasolve(E,[x1,x2,y1,y2],[0.086 -0.176 1.0125 1.0099]) But the solution is complex-valued since your function h is com...
24 hours ago | 0
symbolic solving system of non-linear equations
A system of 12 equations in 6 unknowns usually has no solution since it is overdetermined. Or can you extract 6 of the 12 equati...
1 day ago | 1
square matrix containing Chebyshev polynomials becomes singular when its size becomes greater than a certain value
t0 = 0; tf = 4; N = 75; syms x h = chebyshevT(0:N, x); A = zeros(N+1,N+1); d = zeros(N+1,1); for c=1:N+1 d(c,1) = ...
2 days ago | 1
| accepted
I was calculated using the Simpson 1/3 rule numerical method, why my running results doesn't appear in the command window?
Use ai=((b-a)/6)*(xa+4*(xb)+xc) %main equation instead of ai=((b-a)/6)*(xa+4*(xc)+xb) %main equation clear all; clc; %in...
3 days ago | 0
Laplace with Heaviside step function solving with ode45
You try to access Y(3), but you have only two differential equations for Y(1) and Y(2), I guess. And the "Y" must be "y" becaus...
3 days ago | 0
| accepted
How to find roots of a quartic function with unknown constant coefficients?
syms x a p = x^4 + 10.1*a*x^3 + 1.81*x^2 + 9*a*x + 0.81; sol = solve(p==0,'MaxDegree',4) vpa(subs(sol,a,1)) % E.g. for a = ...
3 days ago | 0
Se queda paralizado no corre todo el código y no me dice el error tampoco
Do you see why your code fails ? f=@(x)exp(sin(x))-x; f(-1) f(2) x=-1:0.01:2; plot(x,f(x)) You must start with two points ...
3 days ago | 0
Warning: Solutions are parameterized by the symbols: [z, z1], z1.
The "solution" you obtain with the code from above is just a repetition of your equations. Use instead clc clear V1 = 480 ; ...
3 days ago | 0
| accepted
Generate a group of random number
Maybe you mean a Truncated Normal Distribution: https://uk.mathworks.com/help/stats/prob.normaldistribution.truncate.html
3 days ago | 0
How to make a 2 parameter Generalized Pareto distribution? steps required
Use https://uk.mathworks.com/help/stats/makedist.html
3 days ago | 0
finding the solution of a matriciel Differential Equation
Your equations cannot be solved analytically using "dsolve". Use a numerical solver instead: J=0.024; p=2; f=50; ws=2*pi*f...
4 days ago | 0
I try to calculate the following integral
Wolfram Alpha gives an answer in terms of the Meijer G-function: https://www.wolframalpha.com/input?i=integration&assumption=%7...
4 days ago | 1
| accepted
Do not understand how to make my index exceed 1. (thank you)
In the first line of the for-loop, you set bstress to a scalar value. So in the statement if bstress(i) < NegEstress(i) bst...
6 days ago | 0
Error using vertcat Dimensions of arrays being concatenated are not consistent.
Maybe you mean something like this. I don't know whether it must read y(1) or y(2) at the place marked in bold letter in the ne...
6 days ago | 0
Hello, I am making an algorithm to calculate temperature over steam but I don't know if the logic is well structured.
What your code does is solving R * T ./ (v - b) - a * alpha(T) ./ (v .* (v + b) + b .* (v - b)) = 0 for v. I don't think thi...
6 days ago | 0
terminate loop diverging to inf
I'm not sure, but I guess you meant something like this: NT = 1024; N = 2048; r = 0.9; omega = (sqrt(5)+1)/2; phi = 2*pi*om...
6 days ago | 0
| accepted
Sum of sines optimized starting points
https://uk.mathworks.com/matlabcentral/answers/511413-curve-fitting-tool-starting-points If your problem is linear in the fitti...
8 days ago | 0
| accepted
My index starts at the second element. I dont know why
Before MATLAB enters the for-loop, t(i), v(i) and x(i) are only defined for i = 1. In the loop, you also don't define t(i), v(i)...
8 days ago | 0
Rational function produced by the Curve Fitter App does not match the output graph
Look up the documentation to see what the option opts.Normalize = 'on'; means. The coefficients are used to approximate y vs...
9 days ago | 0
Badly conditioned equations - how can I centre and scale properly
Your problem is linear, but fitting data with an independent coordinate up to 1500 by a polynomial of degree 12 is nonsense. al...
9 days ago | 0
| accepted
Unable to perform assignment because the left and right sides have a different number of elements.
k1v and k2v both are vectors of size 1x60001, but they must be scalars in the assignment. Maybe you mean V(j+1) = V(j) + (k1v(...
10 days ago | 0
How can I simplify this expression using "abs" function?
You must determine the value for k0 where the expression 2*n^3 + 3*n^2 + n - 2*k^3 - 3*k^2 - k - k*(k+1)*(2*k+1) changes sign ...
10 days ago | 0
PDEPE function - BCFUN error
Use function [ptop, qtop, pbot, qbot] = bcfun(ztop, Ttop, zbot, Tbot,t) % hc and Hs are vectors ptop = hc.*(Ttop-env(:,1))+ e...
10 days ago | 0
| accepted
I need help with elemental wise operation for a first point iteration method
%% Input Variable Uinf = 11; % freestream veloctiy (m/s) R = 6.25; % Radius of Rotor (m) ...
10 days ago | 0
Solve ODE without initial condition
Your ODE is nonlinear. The symbolic toolbox is not able to find an analytical solution for it. You will only be able to solve it...
10 days ago | 0
this is my sample code and i have to plot 8 by 8 matrix in my actual code, the code itself is correct but it is taking forever,any other way to plot this please help
w=1:3; c44 = 44; n = numel(w); y = zeros(n,1); y1 = zeros(n,1); y2 = zeros(n,1); y3 = zeros(n,1); for j = 1:numel(w) y...
11 days ago | 0
ODE45 solving 3 equations and comparing to RK-4
%% RK4 methods %% Description % RK4 methods are used to solve coupled first-order ODEs clear close all clc %% Input vari...
11 days ago | 0
How to check the convergence and accuracy of the Problem using BVP4c
Inf = 3 seems to be sufficient: global alpha beta Pr Nb Nt %eq1 alpha=1.2; beta=0.3; %eq2 Pr=1.7; Nb=0.1; Nt=0.1; hold o...
11 days ago | 0
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