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Torsten


Last seen: Today Aktiv seit 2013

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Beantwortet
Fourier Series Curve Fitting and giving its coefficient with respect to eqaution
Two ways: x = [0.015404238 0.027389034 0.03937383 0.051358625 0.063343421 0.075328217 0.087313012 0.099297808 0.111282604 0.123...

etwa 4 Stunden vor | 0

Beantwortet
Weird difference between matlab's evaluation of elliptic integral to my implementation
You have to supply k^2, not k: ellipke(0.25)

etwa 7 Stunden vor | 1

| akzeptiert

Beantwortet
Make this equation periodic (repeating every t_c seconds)
Maybe like this: Q_peak = 1; t_s = 0.1; t_c = 0.3; fun = @(t)Q_peak*sin((pi*t)./t_s).^2.*(t>=0).*(t<=t_s); F = @(t)fun(mod(...

etwa 23 Stunden vor | 0

| akzeptiert

Beantwortet
Optimaloptions doesn't seem to work
You didn't include the "options" setting in the call to "fsolve": x= fsolve(f,[0.01,0.01,0.01,0.01,0.9,0.1,0.1,0.1,10000],optio...

2 Tage vor | 0

| akzeptiert

Beantwortet
Printing all outputs of the function that has been solved via ode45
Assuming m and h are scalars, use [time_vert,sol_vert]=ode45(@(t,x)endoFlightDeriv(t,x,E,L,PhaseCode),tspan,x0,options) for i ...

2 Tage vor | 1

Beantwortet
boundary conditions at infinity
You must use a sufficiently large number instead of "Inf" here: x = linspace(0,Inf,100)

2 Tage vor | 0

Beantwortet
lsqnonlin (lsqcurvefit , fmincon) does not change the variables in an optimization process to find the best fit
We don't know if you get modified values for the array "force" from "ABAQUS" if the input vector "x" to "sim_res" is slightly ch...

3 Tage vor | 1

| akzeptiert

Beantwortet
DIfferences on Sloped field using 'dsolve' and 'ode45'
The dsolve solution satisfies y(0) = 1: cond = y(0) == 1; the ode45 solution satisfies y(-5) = 1: [u,v] = ode45(f,[-5 5],1);...

3 Tage vor | 1

| akzeptiert

Beantwortet
How to integrate the Rice distribution and build a graph?
As written, H is an integration variable - you cannot prescribe a value for it since it runs from 0 to Inf. v = 1; sigma = 0.0...

3 Tage vor | 0

Beantwortet
How to define a binary variable in non linear constraints
Solve two problems: One with x(1)+x(2)+x(3)>= 0 x(4)=1 the other with x(1)+x(2)+x(3)<= 0 x(4)=0 and take the best of the...

3 Tage vor | 0

Beantwortet
why do i get 'off', 'Octave:abbreviated-property-match' error warning in eeglab?
Maybe you set ismatlab = false somewhere, but started in a MATLAB environment ?

4 Tage vor | 0

Beantwortet
Optimisation for 3-element Windkessel Model Not Working - Using Least Squares Method and fminsearch. Advice? Should I use other optimisation algorithms?
I'd try to continue with the code below. It seems that a variation of your initial parameters does not cause a change in P suc...

4 Tage vor | 0

| akzeptiert

Beantwortet
problem of 2d PDE animation
g = 'squareg'; b = 'squareb3'; c=1;d=1;a=0;f=0; [p,e,t]=initmesh(g); x=p(1,:).';y=p(2,:).'; u0=atan(cos(pi*x)); ut0 = sin(...

4 Tage vor | 0

| akzeptiert

Beantwortet
Error With Least Squares Approximation
Besides the fact that it's numerical nonsense to fit a polynomial of degree 20 to data: What do you get if you simply use coef...

5 Tage vor | 0

Beantwortet
Failure in initial nonlinear constraint function evaluation. FMINCON cannot continue.
Most probably you mean c(i) = -(((X(i) - x_curr)/sqrt((X(i) - x_curr)^2 + (X(i+n) - y_curr)^2 )) * X(i + 3*n) + ((X...

5 Tage vor | 0

Beantwortet
Initial Conditions for Newton Raphson Method for 9 equations 9 unknowns problem set
It's the same behaviour with "fsolve", MATLAB's nonlinear solver. The seven equation problem is solved without problems, and th...

6 Tage vor | 0

Beantwortet
How to assign outputs of a function to an anonymous function in order to optimize with lsqcurvefit
What hinders you from using the usual coding like this ? % test data xdata = ... [0.9 1.5 13.8 19.8 24.1 28.2 35.2 60.3 74.6...

6 Tage vor | 1

Beantwortet
This is a macroeconomic expression under the topic of real rigidities in long run
syms W_i P nu L n m p sigma real omega = (W_i/P-nu)*L/n*(m^p*W_i/p)^sigma simplify(diff(omega,W_i))

7 Tage vor | 0

Beantwortet
intergration of function failed to calculate
syms X1 a0 a1 a2 a3 a4 a5 a6 L EI yApprox = a0 + a1*X1 + a2*X1^2 + a3*X1^3+ a4*X1^4 + a5*X1^5 + a6*X1^6; y1Approx= diff(yApp...

7 Tage vor | 0

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Beantwortet
Chemical reaction model in accompany with CFD in Matlab
MATLAB is not the suitable tool to solve CFD problems. Use ANSYS or something similar for this. Usually, these tools already hav...

8 Tage vor | 1

Beantwortet
matlab guide for Calculating 6 dimensional numerical integral Dosen't work
tmax in Q1 must be a scalar, not a function handle. Try "integralN": https://uk.mathworks.com/matlabcentral/fileexchange/47919...

9 Tage vor | 2

Beantwortet
Solving a system of differential equations with a variable stored in an array
This is what you get with your equations and your data for beta: T = 0:30:360; b = [0.50, 0.49, 0.45, 0.33, 0.27, 0.32, 0.37, ...

9 Tage vor | 0

Beantwortet
Newton's Method on MATLAB for Stationary Solutions for the Non-linear Klein-Gordon Equation
All you see in the graphs are floating point errors. Your system of equations has solution x(i) = 0 for 1 <= i <= numBases and...

10 Tage vor | 0

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Beantwortet
Defining a time-dependent boundary feature
https://uk.mathworks.com/help/pdf_doc/pde/pde.pdf Chapters: Specify Boundary Conditions > Nonconstant Boundary Conditions Sp...

10 Tage vor | 0

Beantwortet
How to write a Monte Carlo Simulation?
ps = 120; pb = 30; Profit = @(q,D) ps*min(q,D)-pb*q; number_of_trials = 1000000; expected_profit = zeros(301,1); for i = 0:...

10 Tage vor | 0

| akzeptiert

Beantwortet
This is an iterative program, but the result is wrong. Why?
g = @(x) cos(x); xc = fpi(g,1,1e-6) g(xc) function xc = fpi(g,x0,tol) xold = x0; error = 2*tol; while error > tol ...

10 Tage vor | 0

Beantwortet
Solving simple integro-differential equation using dsolve in Matlab
If you insert the line simplify(diff(x,t)+2*x+2*x*t) you will see that this expression turns out to be equal to 0. So MATLAB i...

10 Tage vor | 0

Beantwortet
Integrating the density function of Brownian motion
Maybe it helps to resolve the integration with respect to t: syms t T real positive syms x real g = 1/sqrt(t)*exp(-x^2/t); i...

11 Tage vor | 0

Beantwortet
Helmholtz problem in circular disk
According to your code, data(i,j) is a zero of besselj(j-1,x) in the interval [(i-1)*pi i*pi]. So let's plot besselj(1,x) and b...

12 Tage vor | 1

Beantwortet
How to build a graph using stem for a given equation?
Since your delta function does not support array inputs, you must use something like x1=a1*arrayfun(@(n1)delta(n1-b1),n1) inst...

12 Tage vor | 1

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