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I am getting non-linear constraint error in the optimization problem
"solve" chooses MATLAB's "ga" to tackle your problem, but "ga" has the restriction that integer constraints and nonlinear inequa...

2年以上前 | 0

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Solution of nonlinear equation is different for different initial values
Most probably, your second system of 5 equations has multiple solutions. If you add the lines x0 = x_n; F = [f1(x0(1), x0(2...

2年以上前 | 0

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I need to input a matrix of size 2x2 which is something like this A= [ 1 - 1.8629z-1 + 0.8669z-2 , 0 ; 0 , 1 -1.8695z-1 + 0.8737z- 2 ] which is a 2x2 Matrix
Define A as a function of z: A = @(z)[1-1.8629*z,0;0,1-1.8695*z+0.8737*z^2]; A(2) or as a symbolic matrix syms z A(z) A(z)...

2年以上前 | 0

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Why do I receive a given error?
According to the error message, MotorSpeed, SleepSpeedThreshold_int_dbl and/or Tref_Ramp are arrays, not scalars. So if you wa...

2年以上前 | 0

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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...

2年以上前 | 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)

2年以上前 | 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(...

2年以上前 | 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...

2年以上前 | 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 ...

2年以上前 | 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)

2年以上前 | 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...

2年以上前 | 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);...

2年以上前 | 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...

2年以上前 | 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...

2年以上前 | 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 ?

2年以上前 | 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...

2年以上前 | 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(...

2年以上前 | 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...

2年以上前 | 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...

2年以上前 | 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...

2年以上前 | 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...

2年以上前 | 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))

2年以上前 | 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...

2年以上前 | 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...

2年以上前 | 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...

2年以上前 | 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, ...

2年以上前 | 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...

2年以上前 | 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...

2年以上前 | 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:...

2年以上前 | 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 ...

2年以上前 | 0