Statistics
0 Questions
6.230 Answers
RANK
14
of 289.729
REPUTATION
15.364
CONTRIBUTIONS
0 Questions
6.230 Answers
ANSWER ACCEPTANCE
0.00%
VOTES RECEIVED
1.788
RANK
of 19.580
REPUTATION
N/A
AVERAGE RATING
0.00
CONTRIBUTIONS
0 Files
DOWNLOADS
0
ALL TIME DOWNLOADS
0
RANK
of 144.105
CONTRIBUTIONS
0 Problems
0 Solutions
SCORE
0
NUMBER OF BADGES
0
CONTRIBUTIONS
0 Posts
CONTRIBUTIONS
0 Public Channels
AVERAGE RATING
CONTRIBUTIONS
0 Highlights
AVERAGE NO. OF LIKES
Feeds
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...
ongeveer 10 uur 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...
ongeveer 13 uur ago | 1
| accepted
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...
ongeveer 19 uur 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 ...
ongeveer 20 uur ago | 0
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,...
2 dagen ago | 1
need to compile outputs from for loop into array
In most cases, outputarray = zeros(1,nnz(mod(yeararray,4)==0)) will work.
3 dagen ago | 0
| accepted
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...
3 dagen 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...
3 dagen 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....
3 dagen 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)
3 dagen 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).
3 dagen 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 (:)...
3 dagen 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...
3 dagen ago | 0
| accepted
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 ...
4 dagen 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...
4 dagen ago | 1
| accepted
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 ...
4 dagen 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...
5 dagen ago | 0
| accepted
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...
5 dagen 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...
7 dagen ago | 1
| accepted
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....
7 dagen 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...
7 dagen ago | 0
| accepted
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...
8 dagen 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...
8 dagen ago | 0
| accepted
Solving edge-value problems with unknown intervals
Define a dimensionless variable x' = x/l1 and transform your equation to the form dY/dx' = ... which has to be solved in [0 1]. ...
8 dagen ago | 1
How to calculate a composite triple integral with exponential function?
Setting l, r and s to zero will cause problems because you divide by these variables. But also changing integral2(@(s,l)array...
8 dagen ago | 0
| accepted
Error using lsqncommon Lower and upper bounds not supported with complex-valued initial function or Jacobian evaluation.
If you use "fmincon" and (f(x,xdata)-ydata)' * (f(x,xdata)-ydata) as objective function, complex numbers don't matter because th...
9 dagen ago | 0
| accepted
Solve a complex differential equations system
The main problem with your equations is that they involve a term that has to be evaluated at a boundary point. Otherwise, you co...
9 dagen ago | 0
an ode with arguements
You have to define your vector of solution variables as y(1) = f, y(2) = f', y(3) = f'', y(4) = T, y(5) = T' and your function...
9 dagen ago | 0
How to invert a square matrix using Gaussian elimination
The newton update is x_(n+1) = x_n - Df^(-1)*f, not x_(n+1) = x_n + Df^(-1)*f. But you should not explicitly compute the ...
10 dagen ago | 1