Answered
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...

29 dagen ago | 2

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Answered
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);...

29 dagen ago | 1

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Answered
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...

30 dagen ago | 0

Answered
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...

30 dagen ago | 0

Answered
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 ?

ongeveer een maand ago | 0

Answered
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...

ongeveer een maand ago | 0

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Answered
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(...

ongeveer een maand ago | 0

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Answered
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...

ongeveer een maand ago | 0

Answered
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...

ongeveer een maand ago | 0

Answered
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...

ongeveer een maand ago | 0

Answered
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...

ongeveer een maand ago | 1

Answered
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))

ongeveer een maand ago | 0

Answered
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...

ongeveer een maand ago | 0

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Answered
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...

ongeveer een maand ago | 1

Answered
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...

ongeveer een maand ago | 2

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Answered
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, ...

ongeveer een maand ago | 0

Answered
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...

ongeveer een maand ago | 0

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

ongeveer een maand ago | 0

Answered
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:...

ongeveer een maand ago | 0

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Answered
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 ...

ongeveer een maand ago | 0

Answered
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...

ongeveer een maand ago | 1

Answered
How to optimise an objective function with a summation of integrals
The support of Aeq and beq inputs was introduced in release R2023a. You should always consult the documentation relevant for yo...

ongeveer een maand ago | 0

Answered
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...

ongeveer een maand ago | 0

Answered
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...

ongeveer een maand ago | 1

Answered
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...

ongeveer een maand ago | 1

Answered
How do I code a Hamiltonian Cycle in an undirected weighted graph?
I didn't test it yet, but maybe this one from the File Exchange: https://uk.mathworks.com/matlabcentral/fileexchange/51610-hami...

ongeveer een maand ago | 0

Answered
Find critical points of parametric function
The critical points are solutions of a polynomial of degree 6 in z. There is no solution formula for roots of polynomials of deg...

ongeveer een maand ago | 1

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Answered
Central and Forward difference schemes heat conduction for two-layer materials
heattransfer() function heattransfer xstart = 0; xend = 1; xinterface = 0.25; xmesh1 = linspace(xstart,xinterface,25); xme...

ongeveer een maand ago | 0

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Answered
Average Optimization using GA or intlinprog algorithms
https://uk.mathworks.com/matlabcentral/answers/2063957-optimization-problem-with-array-input?s_tid=srchtitle

ongeveer een maand ago | 0

Answered
how to ues the exponentials and derivatives in bvp4c
yp1 = deval(S,1) ym1 = deval(S,-1); T1= exp(-b1*(1+m))*ym1(4); T2= exp(-b1)*yp1(4); N1= -(1+b2*(1+m))*ym1(5); N2= -(1+b2)*y...

ongeveer een maand ago | 0

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