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Feeds
Packed bed storage modeling probelm
rhoS = 2750; % Solid density [kg/m^3] cpS = 850; % Solid specific heat capacity [J/(kg*K)] ks = 1.28; ...
4 hours ago | 0
Extracting values from optimization variable and setting constraints
Defining vectors QTYup and QTYdown as integer vectors with 0<=QTYup(i)<=5 and -5<=QTYdown(i)<=0 (i=1,...,3 for tomatoes, onions ...
16 hours ago | 0
I am trying to form a conditional loop that shows the growth of money, I put in $1000 every year and it grows by 85 for ten years but keep returning one value
money = zeros(10,1); supersaver = 1000; Return = 0.08; money(1) = supersaver*(1+Return); % Money at end of year 1 for i = 2...
20 hours ago | 0
Getting error while trying to solve boundary condition equations.
For M1 = 0-0.4, bvp4c cannot find a solution. So I started with M1 = 0.5. close all; clear all; clc; K1=0; eta1=0.2; eta2=0....
1 day ago | 0
Meijer G-function MATLAB Implementation Problem
Cbar = 1.4361*meijerG([0],[1,1.22,1.72],[0.7200,1.2200,1.4510,1.9510,1.2550,1.7550,0,0],[],331.6059)
1 day ago | 1
| accepted
Where can I learn how to do regression in Matlab
First learn how to approach your problem from the statistical side, then look how to implement this theoretical approach in MATL...
1 day ago | 0
Trying to use Newton Raphson Method to solve circuit design
w = 1; T = 2*pi/w; tn = 0:T/40:T; I = 1e-15; Vt = 25.9e-3; Vo = 10; V1 = 6; V2 = 6; R = 50e3; x0 = [0.7;0.7]; e_d = 1...
1 day ago | 1
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rror using odearguments @(T,Y)ODE_LR(T,Y,KF_L,KB_1) returns a vector of length 2, but the length of initial conditions vector is 10002. The vector returned by @(T,Y)ODE_LR(T,Y
Use Non_Active_Receptor_concentration0 = 100; Active_Receptor_concentration0 = 0; instead of Non_Active_Receptor_concentrat...
2 days ago | 0
plot the function which is dependent on x, y and z with x, y and z on three axis.
You can plot the function on slices (i.e. 2d-objects (e.g. planes)) through the volume of interest. Of course a full plot over ...
2 days ago | 0
How do I feed ODE45 a cell array ?
Use state_dot as the function that you pass to the integrator. I followed your coding - the problem setup could have been much ...
3 days ago | 0
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Getting integrand error from triple integral code code
f must return a vector of ones of the same size as the inputs x, y or z (which all have the same sizes). Thus replace f = @(x,...
4 days ago | 1
need to compile outputs from for loop into array
In most cases, outputarray = zeros(1,nnz(mod(yeararray,4)==0)) will work.
4 days ago | 0
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Error ---> Brace indexing is not supported for variables of this type.
clc clear g = 9.81; L = 0.1; m = 0.5; zeta = 2; x0 = 0.25; v0 = 0; tspan = [0 10]; step_sizes = [0.1, 0.05, 0.025...
4 days ago | 0
error lsqcurvefit for integrate function
Replace % Define the model function (vectorized for efficiency) function y = model(theta, x) k0 = theta(1); E0 = theta(2...
4 days ago | 0
How to set Drichlet and Neumann boundary conditions for a set of ode in BVP solver
Is there a possibility that I can set three boundaries (mix between Drichlet and Neumann boundary) for a set of two ODE's? No....
4 days ago | 0
Trying to determine roots of this polynomial (Det)
k = [1750 -750 0; -750 1250 -500; 0 -500 500]; m = [75 0 0; 0 75 0; 0 0 50]; eig(k,m)
4 days ago | 1
Civil engineering coding problem ( I dont know where the problem in my code is and how to solve it, thanks in advance )
"coord" has only three rows, but you try to access coord(4,1) and coord(4,2) which do not exist (see above).
4 days ago | 0
Why I am getting this error message? How to fix it?
Maybe you mean this function: function v = vec(m) %Helper function to turn a matrix of any size into a column vector using (:)...
4 days ago | 1
How to draw a three-dimensional function image corresponding to the analytic expression of a given piecewise function image
f = @(x,y)(4*y-4*x.*y-2*y.^2).*(y<x).*(x+y<1)+2*(1-x).^2.*(y<x).*(x+y>=1)+(4*y-4*y.^2-2*x.^2).*(y>=x).*(x+y<1)+(2-4*x+4*x.*y-2*y...
4 days ago | 0
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Generalized Orr Sommerfield error returned in Eigs Function
I suggest you comment out the command W0 = @(x) lambertw(0,x); like %W0 = @(x) lambertw(0,x); include a function for W0 as ...
5 days ago | 0
How can i solve this problem' when i am running, this message appears: Failure in initial objective function evaluation. FMINUNC cannot continue.
Call your function in which you define the sum of differences squared between real and modelled data for the initial values of y...
5 days ago | 1
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hypergeom function, no output
The hypergeometric function has convergence criteria: Converges if p ≤ q and |z| < ∞. Converges if p = q + 1 and |z| < 1. For ...
6 days ago | 1
| accepted
How to plot a simple wave equation using method of lines?
n = 100; m = 100; tf = 1; dx = 1/n; x = linspace(0,1,n+1)'; tspan = linspace(0,tf,m+1); y0 = [sin(2*pi*x);zeros(n+1,1)]; %[t...
6 days ago | 0
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Analytical solution of 1-D transient heat transfer
I'd compare with the solution from "pdepe": m = 1; Ri = 0.05; nd = 20; r = linspace(0,Ri,nd); t = [0 100 600 1800 3600 5000...
7 days ago | 0
Solve Nonlinear ODE Symbolically
This is a nonlinear system of ODEs. An analytical solution with symbolic math is not possible. The only way to solve it is nume...
8 days ago | 1
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Triple intergral for the array valued function
N = cell(2,3); N{1,1} =@(x,y,z) x.^2+y.^2+z.^2; N{1,2} =@(x,y,z) x.^2+y.^2+z.^2; N{1,3} =@(x,y,z) x.^2; N{2,1} =@(x,y,z) y....
8 days ago | 0
does "generalized Neumann" boundary condition include actual Neumann boundary condition?
Is there maybe a workaround (like change of variables) to solve these problems? No. All Neumann boundary conditions are related...
8 days ago | 0
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Graphing 1D Diffusion in 2 Compartments - Possible Issue with ODE solver
In my opinion, you have the following conditions at the interface x = h_D: (1) D_D*dC_D/dx = D_R*dC_R/dx (2) C_R = phi*C_D (or...
9 days ago | 0
I want to optimize an ODE system of equations with constraints
I ran your code with k in the order of 0.1,1 and 10, but it seems the k-values have amost no influence on the result of the inte...
9 days ago | 0
| accepted