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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...
ongeveer 6 uur ago | 0
Weird difference between matlab's evaluation of elliptic integral to my implementation
You have to supply k^2, not k: ellipke(0.25)
ongeveer 10 uur ago | 1
| accepted
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(...
1 dag ago | 0
| accepted
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 dagen ago | 0
| accepted
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 dagen ago | 1
boundary conditions at infinity
You must use a sufficiently large number instead of "Inf" here: x = linspace(0,Inf,100)
3 dagen ago | 0
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 dagen ago | 1
| accepted
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 dagen ago | 1
| accepted
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...
4 dagen ago | 0
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...
4 dagen ago | 0
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 dagen ago | 0
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 dagen ago | 0
| accepted
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 dagen ago | 0
| accepted
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 dagen ago | 0
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 dagen ago | 0
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 dagen ago | 0
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...
7 dagen ago | 1
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 dagen ago | 0
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...
8 dagen ago | 0
| accepted
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 dagen ago | 1
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...
10 dagen ago | 2
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, ...
10 dagen ago | 0
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 dagen ago | 0
| accepted
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 dagen ago | 0
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 dagen ago | 0
| accepted
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 dagen ago | 0
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...
11 dagen ago | 0
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 dagen ago | 0
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 dagen ago | 1
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 dagen ago | 1