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Solving Boundary Value Problem in 2D
Interpret x as time(t) and y as length(x) and use MATLAB's "pdepe". Best wishes Torsten.

8 years ago | 0

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Answered
function handle how to apply to dsolve???
Use function handles if you want to integrate numerically, use symbolic expressions if you want to integrate symbolically. Be...

8 years ago | 0

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The use of shooting algorithm to solve the second-order differential equations
The implementation of this problem in MATLAB is much more difficult than you did above. Here is a guideline: https://www2....

8 years ago | 0

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How to find next number divisible by n
b = a + (n - rem(a,n)) Best wishes Torsten.

9 years ago | 0

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Results for eig function
Use format longE Best wishes Torsten.

9 years ago | 0

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Answered
Error in nested integration
fun1= @(y) y+ integral(@(x)fun(x,y), 0,1,'ArrayValued',true); Note that fun is undefined at y=0. Thus c1 should come out as...

9 years ago | 0

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Answered
How to solve a system of parabolic partial differential equations in time and 1 D space
One mistake in your settings: f = [k*DuDx(1) ; kG*DuDx(2)]; s = [(u(2)-u(1))*alph-cv*mdot/A*DuDx(1);(u(1)-u(2))*alph...

9 years ago | 1

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Answered
I want a code for solving a coupled 3rd order and 2nd order ode using shooting method and RK-4 numerical technique , please if anyone could help
Try function main global Pr k1 M lambda Pr=0.7; k1=0.1; M=1; lambda=0.1; rlow=0; rhigh=10; N=1000; op...

9 years ago | 0

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Answered
Probability airport question code.
function boarding %100 passengers %We assume that Frank's seat is seat 99, your seat is seat 100. %Further assume tha...

9 years ago | 0

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sum calculation in matlab
If you define Z, S, T as numerical arrays, you can determine a and b as A = [-sum(S.*S) sum(S.*T);-sum(S.*T) sum(T.*T)]; ...

9 years ago | 0

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Converting Matlab ode45 into C with complex output
*"the output data must be real when enforcing non-negativity...".* But you seem to use the non-negativity option of ODE45 whi...

9 years ago | 0

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second order differential equation
function van = vandp(x,y) u = 0.1; %x(1) = 2; %y(1) = 1.5; van=-u*(x^2-1)*y-x; Best wishes Torste...

9 years ago | 1

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Can MATLAB solve a integrodifferential equation?
u = 1/int(y*z,x,0,2*pi) Best wishes Torsten.

9 years ago | 1

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Answered
Ramp Rate constraint in Economic Dispatch using Linprog function
f = [1000 500 0 0 300]; %%Objective function A = []; b = []; Aeq = [1 1 1 1 1]; %% Equality Constraint beq = L; ...

9 years ago | 4

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System of linear equation with mixed solution
If you have 5 equations in 5 unknowns and linsolve does not complain that the matrix is singular, your system has a unique solut...

9 years ago | 0

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How to get integration of x to the power (1/n) n is the real number from -1 to 1?
I think you mean f=@(x)sign(x)*(abs(x))^(1/3); Best wishes Torsten.

9 years ago | 0

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Answered
Fitting experimental data to ODE add additional fitting parameter which should not be integrated by ODE-Solver
if true % function bestc = odeParamID() %% Create some "experimental data" clc; clear all; clf filename = 'Methano...

9 years ago | 1

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Answered
Is it possible to solve this problem with intlinprog? (extended problem from last post)
costs = [1000;200;0;0;0;0;0;0]; A = [1000;2000;5000;6000;2000;3000]; BC = [20 20 5 5 30 10;5 5 30 25 15 10]'; BC = [B...

9 years ago | 0

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Why is my iteration not working. ? ( the solution array has all the same value from first iteration )
function main for i=1:40 vol(i) = 5e-6+(i-1)*1e-6; xsol(i)=fsolve(@(x)Gaddis(x,vol(i)),1e-4); end plot(vo...

9 years ago | 0

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Answered
probability data distribution randomly or with some probability
Let a(j) be the number of vehicles arriving between hour j-1 and hour j (j=1,...,24). So a is a row vector with 24 element. T...

9 years ago | 0

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how to solve this system differential equations?
fun=@(t,z)[0.2*z(1)^9*(1/z(1)^8+1/z(2)^8-1)^1.125;0.3*z(2)^9*(1/z(1)^8+1/z(2)^8-1)^1.125]; tspan = linspace(0,5,20); z0 ...

9 years ago | 0

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incorrect result in solving system using MATLAB ?
Try Z = null(mat) It should give you a vector Z different from the zero vector that solves mat*Z = 0 Best wish...

9 years ago | 0

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How to solve dependent PDEs
Interesting problem. I'd try this way: Multiplying the second equation (p = ...) by 2*pi*r and integrating both sides from...

9 years ago | 0

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what is properly method to optimization of four parameter to be one value?
So you have four data points (X1,Y1), (X2,Y2), (X3,Y3), (X4,Y4) and you want to find the "best" A such that [Y1 Y2 Y3 Y4]...

9 years ago | 0

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Answered
Implementing forward Euler method
Call "euler_method" in a loop for n = 8*2^k (k=1,...,15) and store Y(n+1,1) for each run. Then make the plot. Best wishes ...

9 years ago | 0

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Answered
Bvp4c Error; cannot solve collocation equations- singular Jacobian
Replace function dy=projode(n,y) global Pr A M Ec dy=[y(2); y(3); A*y(2)+A*n*y(3)/2+M*y(2)+y(2)^2-y(1)*y(3)-1-A-M; y(...

9 years ago | 0

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Answered
Define distribution function to be zero if ecdf(X) is not defined
[f,x] = ecdf(X); Ecdf=@(p) interp1(x,f,p)*(p>=50) Best wishes Torsten.

9 years ago | 0

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Answered
I'm stuck and don't even know where to start
Try to understand the following code: https://de.mathworks.com/matlabcentral/fileexchange/2155-numerical-linear-algebra-and-a...

9 years ago | 0

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I am trying to fit a curve
Use ft = fittype(@(a, b, c, x) a * log(b * x) + c, 'options', fitoption) And for parameter b, don't use 0 as initial gue...

9 years ago | 0

Answered
Extrpoolation not along dimension
There is no "obvious" way to extrapolate data - that's why several methods exist to do so. There is no other way than just sp...

9 years ago | 0

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