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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...

más de 2 años hace | 1

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

más de 2 años hace | 1

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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(...

más de 2 años hace | 0

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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...

más de 2 años hace | 0

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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 ...

más de 2 años hace | 1

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

más de 2 años hace | 0

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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...

más de 2 años hace | 2

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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);...

más de 2 años hace | 1

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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...

más de 2 años hace | 0

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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...

más de 2 años hace | 0

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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 ?

más de 2 años hace | 0

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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...

más de 2 años hace | 0

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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(...

más de 2 años hace | 0

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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...

más de 2 años hace | 0

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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...

más de 2 años hace | 0

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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...

más de 2 años hace | 0

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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...

más de 2 años hace | 1

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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))

más de 2 años hace | 0

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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...

más de 2 años hace | 0

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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...

más de 2 años hace | 1

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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...

más de 2 años hace | 2

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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, ...

más de 2 años hace | 0

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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...

más de 2 años hace | 0

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

más de 2 años hace | 0

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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:...

más de 2 años hace | 0

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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 ...

más de 2 años hace | 0

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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...

más de 2 años hace | 1

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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...

más de 2 años hace | 0

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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...

más de 2 años hace | 0

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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...

más de 2 años hace | 1