Answered
How to deduct obtained fuel value from initial weight
Most probably something like this. I don't know where you use some of the defined variables - they seem to be superfluous. %% C...

3 years ago | 1

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Answered
Why do i recieve Dot indexing is not supported for variables of this type error when i call my function
Use [t, vecste] = ode45(@(t,vecste)eom(t,vecste,spec,aero,thrust), tspan, stvecinit); instead of [t, vecste,spec,aero,thrust]...

3 years ago | 0

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Answered
Numerical error for same MATLAB function but generated differently
General answer for an unspecific question: https://uk.mathworks.com/help/symbolic/choose-symbolic-or-numeric-arithmetic.html E...

3 years ago | 0

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Answered
Adding inequality constraints in DAE system
You can't. These problems usually appear in optimal control problems where the DAE integrator is coupled with an optimizer. Par...

3 years ago | 0

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Answered
(ASAP)why symsum can not calculation?????
t = -2:0.1:2; a = 1; N = 60; n = (1:N).'; f = sinc(n/2).*cos(2*pi*a*n.*t/4); s = 0.5 + sum(f,1); plot(t,s)

3 years ago | 0

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Solving a system of equtions with first an pde and the others first order odes
"pdepe" does not support pure ODEs together with a partial differential equation with 2nd order derivatives in space. Use "pde1...

3 years ago | 0

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Mackey Glass equation and ddesd
I'm not sure what you are exactly asking for, but for a history v = 0, the solution is v = 0 for all times t > 0. So the plot y...

3 years ago | 0

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Moment of Lognormal distribution
https://math.stackexchange.com/questions/628681/how-to-compute-moments-of-log-normal-distribution or with MATLAB (the second re...

3 years ago | 1

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I don't know why my code makes odeToVectorField error
From the documentation: odeToVectorField can convert only quasi-linear differential equations. That is, the highest-order deriv...

3 years ago | 1

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Answered
Pareto frontier plot error
In both examples, the two objective functions are not "competitive" since both have (0/0) as optimum combination for x1 and x2 i...

3 years ago | 0

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Application of any numerical root finding method (secant, bisection, etc.)
Plot first, then solve by using the approximate root as initial guess: Cs = 0; d = 0.5; g = 9.81; %User definition of input ...

3 years ago | 2

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Answered
It's a question of finding a static integral There's an error in the formula
integral(@(x)(x+2)./(x+1).^3-exp(-3*(x+3)),0,3) If you cannot input a mathematical formula in MATLAB, I suggest you invest 2 ho...

3 years ago | 0

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Answered
How do I solve an equation with an unknown variable?
I always use pencil and paper: v=70 ; ro=1.225 ; Sw=5 ; c=0.5 ; CM_ac = -18/(0.5*ro*(v^2)*Sw*c)

3 years ago | 0

Answered
Creating 'n' matrices with each one with 'n' in its name
YEAR{n} = zeros(DATE_RANGE(n,3));

3 years ago | 0

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Answered
Matlab double sum over vectors
Note that -pi<=kx<=pi, -pi<=ky<=pi, -pi<=kx'<=pi, -pi<=ky'<=pi because of your linspace choice. And most probably you need to n...

3 years ago | 0

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Solving symbolic third order polynomial
syms t t0 t1 q0 q1 q0dot q1dot a0 a1 a2 a3 f(t) = a0 + a1*(t-t0) + a2*(t-t0)^2 + a3*(t-t0)^3; df = diff(f,t); S = solve([f(t0...

3 years ago | 1

Answered
The number of rows in A must be the same as the number of elements of b error
% Define the coefficients of the objective function as a double vector c = -[-6, 3, 17, 10, 63, 34, 15, 22, -2, 15, ... ...

3 years ago | 0

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Problem with Curve Fitter 95% CI Upper and Lower Bounds' Equations
Have a read here: https://uk.mathworks.com/help/curvefit/confidence-and-prediction-bounds.html It will show you the difference...

3 years ago | 1

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Answered
Error using barrier Objective function is undefined at initial point. Fmincon cannot continue.
If you insert the line augmented_objective(x0) before the call to fmincon, you will see that your objective returns a complex ...

3 years ago | 0

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Solving Pde equation with pdepe solver
If you use the PDE Toolbox, you can define 3d-geometries - if it's that what you mean.

3 years ago | 0

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Answered
Function 'quadprogIP' runs fast seperately but extremely slow in a for loop simulation
Maybe the problems to be solved get larger or more complicated within the for loop so that the average time spent for each probl...

3 years ago | 0

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Function "diff" and the loss of an element in the array
Use "gradient" if you don't want to loose elements: https://uk.mathworks.com/help/matlab/ref/gradient.html

3 years ago | 2

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Answered
solve ode with ode45
Comment out t = [0 5] before calling ode45 in the loop: %t = [0 5];

3 years ago | 0

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Why does solving my equation result in the message "No complex subexpressions allowed in real mode."?
Next time, please report the real problem right at the beginning. %loading the constants eps_w = load('eps_w.mat'); eps_w = e...

3 years ago | 0

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I want 4 solid lines for Fr paramter . but im getting single line why?
S_a() function S_a %%%%note%%%%%%%%% %%%%%%%%%%%%%%%%% decreasing behaviour with F...

3 years ago | 0

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Answered
two layer transient conduction heat transfer with pde
The boundary condition for pdepe reads p + q*f = 0. In your case this leads to hr_int * (urMax - ul) + k1*k1/(rho1*Cp1)*dT/dx...

3 years ago | 1

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solve a second-order differential equation using finite differences, I keep encountering the 'Index exceeds the number of array
Replace your functions by p.m % p.m function result = p(t) result = 2 * t ./ (1 + t.^2); end q.m % q.m function re...

3 years ago | 0

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Why does solving my equation result in the message "No complex subexpressions allowed in real mode."?
Why don't you simply solve for pw ? pw = (eps_exp^(1/3) - eps_l^(1/3))/(eps_w^(1/3)-eps_l^(1/3)) Note that you use eps_w^(1.3)...

3 years ago | 0

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for loop in bvp4c i get circle in plotting not solid line why?
sss() function sss global Fr Pr f2 f1 shi2 shi3 lambda zeta Sk u Re Kf B A H1 H2 H3 C1 C2 C3 P1 P2 P3 K1 K2 K3 Kb n Z ...

3 years ago | 0

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Answered
Please help me in solving the given coupled differential equation? Please also tell me the numerical recipe availabe in matlab for handling such equations.
MATLAB has no tools to solve this kind of equations. I guess they are hyperbolic in nature - so take a look at CLAWPACK: https...

3 years ago | 0