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sym/besseli - Too many input arguments.
There is no third argument in the symbolic function "besseli": https://de.mathworks.com/help/symbolic/besseli.html

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Symbolic Computations for three non-linear equations solution
fl = [1.883806, 1.883135, 1.882170]*10^9; Qe = [161.43, 10.765, 2.5734]*10^4; syms A fu alpha eq1=fl(1)-(1+(A/(Qe(1)^alpha))...

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i am trying nonlinear for nonlinear ode using by finite difference method
You want to solve a nonlinear system of equations using Newton's method, but you didn't supply the Jacobian "df". i.e. df{i}/dx...

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which of the following sets vectors are independent?
In order to prove that sin(t), cos(t) and cos(2*t) are independent, you have to show that if f(t) = a*sin(t) + b*cos(t) + c*co...

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Help in writing a a code for an array based on comdition.
A1 = [-0.0082 -0.0409 -0.0175 -0.0853 0.0217 -0.2556 -0.0302] A = -(A1<0) + (A1>0) s = sum(A) threshold = 12; v...

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Keep getting an error with trapz. Please help
baba = trapz(time,ribua) instead of baba = trapz(T,ribua)

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Fitting a Transcendental Equation with Multiple Solutions
You can try "lsqnonlin" with the functions F_ij defined as F_ij = f(a1,a2,a3,x_i,y_ji) - c Here, the y_ji are the y-values cor...

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ODE45 ERROR en el @odefun
Use dfidt=[dfi1;dfi2]; instead of dfidt=[dfi1(1);dfi2(2)]

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Error using plot. Data must be numeric, datetime, duration or an array convertible to double.
Arm = 5; T = 2; t = linspace(0,5*T,1000); t = t.'; hold on for N=0:Arm n = 1:N; A0 = 5/4*ones(size(t)); An= ...

más de 3 años hace | 0

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Why do fit results and parameter confidence intervals depend on magnitude of units? Why are confidence intervals nonsense on a good fit?
Your model is not adequate because it needs 3 parameters, not 4. Write it as curvem(x) = a.*(x./b).^(-c) + d = a/b^(-c) * x^(-...

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How to observe parameter value existing in constraint while solving problem using "ga"
Add the line left_hand_side = E_prop + cumsum(sol.S.*(sum(Energy_Pr,2))) after the solution has been obtained.

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selecting indices in a matrix and setting the rest to zero
A = rand(5,3); idx = [2 4].'; idx_left = setdiff(1:size(A,1),idx) A(idx_left,:) = zeros(numel(idx_left),size(A,2))

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I am trying to solve current equations of a pv cell using fsolve butit keeps showing error, can someone pls see what the error in my code is?
clc; clear all; Pmpp = 50; %Max Power Vmpp = 17.98; %Vol at Pmax Impp = 2.77; %Current at Pmax Isc= 3; ...

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Use one function in another
n = 7; a = [3 4 1 2 5 2 1]; A = createMatrix(n, a) period = findPeriod(A) function A = createMatrix(n, a) A = zeros(n);...

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Bvp4c 2nd order equation with 2nd and 3rd order boundary conditions
Since you can only impose two boundary conditions for a second-order equation, take the first and the third. They should already...

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Solve non linear m equations in n unknows with m,n
k = lsqnonlin(F,k0)

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How can ı solve this difference equation ?
um2 = 0; um1 = 0; u0 = 1.5820; u1 = -0.5820; u2 = 0; xm2 = 0; xm1 = 0; x0 = 1.3679*xm1 - 0.3679*xm2 + 0.3679*um1 + 0.2642...

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Variable not saving as a double
You mean t = 0:1:100; x = 0.5*exp(2*sin(t))./(10.5*exp(2*sin(t))); plot(t,x) (which is equal to 0.5/10.5=0.04761... because ...

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Constraints on Parameter Estimation
Use lsqlin instead of fitlm.

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problem in creating function file using ode45
Be careful with the order of the solution vector Y. It is (y, Dy, x, Dx). You have to supply the vector of initial values "ic" i...

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How do I plot two different functions on the same plot?
Use hold on plot(...) % plot first graph plot(...) % plot second graph hold off

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solving series of algebric linear equations using for loop
N = 4; xleft = 1.0; xright = 3.0; x = linspace(xleft,xright,N+1); h = (xright-xleft)/N; A = zeros(N+1); b = zeros(N+1,1); ...

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Unable to perform assignment because the indices on the left side are not compatible with the size of the right side.
You don't define Kb as a global variable in the part of your code where you set it as Kb = physconst('boltzmann'); % 1.38*10^(-...

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Projectile Motion when y0 does not equal 0
Solve y(t) = 0 for t and you'll find tf, the time when the projectile hits the ground.

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Matrix "index in position 1 exceeds array bounds (must not exceed 1)"
i=1; X1(i)=0; X2(i)=0; X3(i)=0; error_X1(i)=9999; error_X2(i)=9999; error_X3(i)=9999; instead of i=1; X1=0; X2=0; X3=...

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invalid expression error.
B = 0.02; a = 0.1; f = 0.53; phi = 3*pi/4; t = -5:0.05:10; x = B^a*exp (-a*t) .*sin(... 2*pi*f*t+phi); xu = x...

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please help i keep getting erro
samsonwork() function sol=samsonwork global Br Sc delta P K R n epsilon %x=linspace(-1,1,11); r=0:0.01:3; Br=1;Sc=0.4;n=3;d...

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fmincon: proble defining the function
f = @definefunction; instead of f=definefunction(x); And you cannot use random inputs on each call - thus comp1 = double(ra...

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Finding linear combination of two vectors such as every element is positive
n = 5; v1 = -10 + rand(1,n)*20 v2 = -20 + rand(1,n)*40 % If there is a solution x for which A*x > zeros(size(A,1),1), then th...

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User defined function within ode45
Symbolic functions like the one you get if you use the "piecewise" command are not allowed with ODE45. Either define the right-...

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