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Question
Error using PDEPE Function (Column Vector Mismatch)
This is the error I get: Unexpected output of PDEFUN. For this problem PDEFUN must return three column vectors of length 2. ...
plus de 8 ans il y a | 1 réponse | 0
1
réponseQuestion
How would the "a" and "c" coefficients be defined in a coupled non-linear set of 2 PDEs?
I have these two coupled non-linear set of PDEs that I have expressed in the standard MATLAB PDE form: <</matlabcentral/answe...
plus de 8 ans il y a | 1 réponse | 0
1
réponseQuestion
Plot a variable in x-y plane.
I have two variables: "z" and "v" which have the following relationship with x and y: z = x^2 - y^2 v = 2xy Its basical...
plus de 9 ans il y a | 1 réponse | 0
1
réponseQuestion
2D plot x-y axis
How can visualize on a 2D plot the variation of a variable say, z of size (100,1), that varies with both x and y, both of size (...
environ 10 ans il y a | 1 réponse | 0
1
réponseQuestion
How to solve a set of 4 first-order non-linear coupled ODEs?
I am trying to solve a 4th order differential equation using shooting method by disintegrating the ODE into four coupled first o...
plus de 12 ans il y a | 2 réponses | 0
2
réponsesQuestion
How to solve a set of coupled ODEs (4th Order)?
Could somebody help me solve this set of four coupled ODEs? tpcl = @(xi,y) [y(2); ((1 + (y(2)*y(2)))^(1.5))*(y(3) - (A/(y(1)...
plus de 12 ans il y a | 1 réponse | 0
0
réponseSolving coupled ODE's by ode45
Star Strider, could you please help me solve this set of four coupled ODEs? tpcl = @(xi,y) [y(2); ((1 + (y(2)*y(2)))^(1.5))*...
plus de 12 ans il y a | 0
Help with trapz(): Getting complex values
Per, How do I make that value real then?! And why would a simple integration result in a complex value at all?
environ 13 ans il y a | 0
Question
Help with trapz(): Getting complex values
Here is my code: I am getting complex values for "T_integral" and that is messing up my temperature profile TSil. Any help will ...
environ 13 ans il y a | 2 réponses | 0
2
réponsesQuestion
How to integrate a matrix of a certain dimension?!
Suppose I have a temperature matrix, T = zeros(Nz+1,Nt+1). Nz are number of elements in the z-axis and Nt are number of elements...
environ 13 ans il y a | 1 réponse | 0
1
réponseQuestion
Getting error: Error using .* Matrix dimensions must agree. Please help. The code the given below.
Nx = 100;Ny = 20;Nt = 4000; x = 0:10/Nx:10; y = -1:2/Ny:1; t = 0:100/Nt:100; Dx = 10/Nx;Dy = 2/Ny;Dt = 10/Nt; a = 0...
environ 13 ans il y a | 1 réponse | 0
0
réponseQuestion
Getting error: Error using .* Matrix dimensions must agree. Please help. The code the given below.
Nx = 100; Ny = 20; Nt = 400; x = 0:10/Nx:10; y = -1:2/Ny:1; t = 0:1/Nt:1; Dx = 10/Nx; % delta x Dy = ...
environ 13 ans il y a | 1 réponse | 0
0
réponseQuestion
How to remove the following error: Attempted to access beta(2); index out of bounds because numel(beta)=1.
Here is my code. Any sort of help will be appreciated. a = @(x) -(x+3)/(x+1); b = @(x) (x+3)/((x+1).^2); f = @(x) 2*(...
environ 13 ans il y a | 1 réponse | 0
1
réponseQuestion
Index must be a positive integer or logical.
I am getting the following error while running the code: Attempted to access R1_rk4(17501); index must be a positive integer ...
environ 13 ans il y a | 3 réponses | 0
3
réponsesQuestion
How to loop a discretely varying function in time?
How to run a function like this in a loop where time is increasing? Radius varying with time: First 2 seconds drops linearly,...
environ 13 ans il y a | 1 réponse | 0
0
réponseQuestion
Find roots of this function!
How would I find the roots to this particular function? f(x) = mod((4 + x)/(4 - 3*x)) - exp(i*t) where; mod = modulus...
environ 13 ans il y a | 1 réponse | 0
0
réponseQuestion
Form a matrix from elements of a second matrix
Suppose if I have a matrix like this: Time = [1;2;3;4;5;6;7;8;9;10] Diameter = [1;2;3;4;5;6;7;8;9;10] If I want to ...
environ 13 ans il y a | 1 réponse | 0
1
réponseQuestion
How to specify a variable (using linspace) like this?
Distance between first and second point and the distance between second last and last point is 0.5h. All other distances between...
plus de 13 ans il y a | 2 réponses | 0
2
réponsesQuestion
How to use ISNAN function?
How to write: if A(i+2,11) == NaN % Originally posted as: if (i+2,11) == NaN using ISNAN function?
plus de 13 ans il y a | 1 réponse | 0
1
réponseQuestion
Process Cells from Excel File
Suppose I have a spreadsheet like this: A B C 1: 0 45 87 2: 0 7 8 3: 1 65 68 4: 0 ...
plus de 13 ans il y a | 2 réponses | 0
