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Matrix dimension must agree
w is size 1x501 not 1x500.

5 years ago | 0

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Finding Solution of an equation with hyperbolic functions within an interval
First draw a graph of the function to see roughly where the roots are, then use fzero: f = @(x) 2*cos(403*x).*sinh(403*x) + 2*...

5 years ago | 0

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How to plot bifurcation with Delay Differential equations?
How about the following for your loop (it assumed you have defined tau earlier in the file): for j=1:N+1 if t(j)<=tau ...

5 years ago | 0

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How to use Find (or any other function) to create an Array
Here's another possible way r = repmat((1:9)',1,5); max(r.*S_dash)

5 years ago | 1

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Euler's Method and Deflection of Cantilever Beam
Your derivative is incorrect for your specified deflection equation. I think your deflection equation is also not quite right....

5 years ago | 0

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Runge Kutta 4 method to solve second order ODE
Your integration loop is mightily scrambled. It should be like this x(1) = x0; y(1) = y0; for i=1:length(t)-1 t(i+1) = i*...

5 years ago | 0

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ode45 with matrix 1st order ode
Does this help z = -1; %parameter Needs to be negative or T1 blows up. n = 2; T0 = eye(n,n); xspan = [0 5*pi]; opts = odes...

5 years ago | 0

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Answered
How can i solve for the maximum? (a little complex)
Here is a brute force and ignorance method! % Maximise Value = (9/7)*Na + (5/4)*Nb + Nc + Nd % Subject to 7*Na + 4*Nb + 3*Nc ...

5 years ago | 0

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How to plot this?
How about ux = [1 0 -1 0 1]; uy = [0 1 0 -1 0]; % The order is CRU GPCC UDEL APH anticlockwise starting on positive x axis. ...

5 years ago | 1

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Answered
Generate signals from trigonometric
More like this perhaps lambda= 1000; dz = 1; z = 0:dz:lambda; f = @(z) (z<lambda/2) - (z>lambda/2); n= 6; %[2 4 6 8 1...

5 years ago | 0

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Runga Kutta Mthod 4
As before, your value for h is too large. Set h = 0.01 and it works!

5 years ago | 0

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Answered
If statement with multiple conditions
Don't forget the indices: if Tp(Tp_Idx)==4 if 30<=r0(r0_Idx)<75 SSGF(Tp_Idx,r0_idx)=(7.84.*10.^(...

5 years ago | 0

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How to solve simultaneously a system of ODEs containing both initial and boundary value problems
Your first two odes could be solved by ode15s, since they don't depend on y(3), then, having solved them, you could investigate ...

5 years ago | 0

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ode; zero input response; drawing the function in matlab
I think you should interpret (D+1)^2y as D^2y + 2Dy + y; i.e. d^2y/dt^2 + 2dy/dt + y Currently you have it as (dy/dt)^2 +2dy/dt...

5 years ago | 0

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Trying to do central difference method
You should probably use the following to calculate the gradient Grad = (f(1+h) - f(1-h))/(2*h); though a much smaller value fo...

5 years ago | 0

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Dimension and line Error
It looks like you have some t's in your expression for Vy(i) that should be t(i).

5 years ago | 0

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The function return value 'euler' might be unset. Es posible que el valor de retorno de la función 'euler' no esté establecido.
1 Probaby best to have f = euler(... rather than euler = f(... if you want to call the function euler. 2 You need to return yo...

5 years ago | 0

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How to use ode45 to plot this code?
You have mixed up doing your own iterations with allowing ode45 to do its iterations! For ode45, just use the following N=1000;...

5 years ago | 1

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Iterative method to find flowrate in pipe in series
Why would you assume the friction factor in the second pipe is the same as that in the first? You ony apply the head loss to th...

5 years ago | 0

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Writing a differential equation for iteration using for loop.
This is known as simple Euler integration. It arises from % dx/dt = (a - x^2 - y^2)*x - omega*y % Let dx/dt be approximat...

5 years ago | 1

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Solve a system of three coupled first-order differential equations
According to the pdf equations, instead of dxdt(3)=(1/(alpha*a))*(1/x(3)-(1+lambda*sin(2*x(2)))*x(3)); you should have dxd...

5 years ago | 1

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Answered
Gaussian distribution in Matlab
Try something like >> M = 1; D = 1; % Set your own values c = @(t,x) M/sqrt(4*pi*D*t)*exp(-x.^2/(4*D*t)); x = -5:0.1:5; t...

5 years ago | 0

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System of differential equation -empty sym
ode1=fiff(v)... should probably be ode1=diff(v)...

5 years ago | 0

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Problem with a function
I don't have your daily log returns vector, so I can't check your result. You are the only person who can decide if the function...

5 years ago | 0

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Problem with a function
Try changing n=lenght(x); to n=length(x); (Notice the spelling).

5 years ago | 0

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rung kutta 4th order
Your integration loop isn't that of a fourth order RK routine. Presumably, -2 is standing in for -infinity here, so you correct...

5 years ago | 0

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help using ODE45
The equations above are a little different from the ones in your initial code, but I've used them in the coding below m0=0.25 ;...

5 years ago | 0

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Plotting multiple points in graph
Here is one way x = 1:10; y = 1:10; [x, y] = meshgrid(x,y); plot(x,y,'k.')

5 years ago | 0

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Runge Kutta method for coupled oscillator system.
Do you mean like this %initializing x,y,t h=0.1; %step size t=0:h:50; x1 = zeros(1,numel(t)); y1 = x1; x2 = x1; y2 = x1; ...

5 years ago | 0

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Numerical integration using Simpsons
I just get 11 values for I3, running your code!

5 years ago | 0

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