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Shashank


Active since 2012

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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. ...

meer dan 7 jaar ago | 1 answer | 0

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answer

Question


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...

meer dan 7 jaar ago | 1 answer | 0

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answer

Question


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...

meer dan 8 jaar ago | 1 answer | 0

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Question


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 (...

ongeveer 9 jaar ago | 1 answer | 0

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answer

Question


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...

meer dan 11 jaar ago | 2 answers | 0

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Question


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)...

meer dan 11 jaar ago | 0 answers | 0

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Answered
Solving 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))*...

meer dan 11 jaar ago | 0

Answered
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?

ongeveer 12 jaar ago | 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 ...

ongeveer 12 jaar ago | 2 answers | 0

2

answers

Question


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...

ongeveer 12 jaar ago | 1 answer | 0

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Question


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...

ongeveer 12 jaar ago | 0 answers | 0

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answers

Question


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 = ...

ongeveer 12 jaar ago | 0 answers | 0

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answers

Question


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*(...

meer dan 12 jaar ago | 1 answer | 0

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Question


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 ...

meer dan 12 jaar ago | 3 answers | 0

3

answers

Question


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,...

meer dan 12 jaar ago | 0 answers | 0

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answers

Question


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...

meer dan 12 jaar ago | 0 answers | 0

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answers

Question


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 ...

meer dan 12 jaar ago | 1 answer | 0

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answer

Question


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...

meer dan 12 jaar ago | 2 answers | 0

2

answers

Question


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?

meer dan 12 jaar ago | 1 answer | 0

1

answer

Question


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 ...

meer dan 12 jaar ago | 2 answers | 0

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answers