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Trying to get my runge-kutta to plot two graphs one of the original differential and one exact solution

So you meant to solve dT/dt = 0.25(75-T) with initial condition of T(0) = 0? If so, then the exaction solution is T(t) = 75-75e^...

10 mesi fa | 0

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How do I plot this graph?

% Here is another code that you may find useful. clear variables close all Cf = [0.0040,0.0028,0.0014]; Pi = [0.5,1.5,4]; ...

10 mesi fa | 0

Solve a partial differential equations using the explicit method

What about dU/dX(1,t)=0. I think this condition is messing in the code. No, it is not. Remember the last attachment I emailed ...

10 mesi fa | 0

Solve a partial differential equations using the explicit method

%% Cp2ex2nd % 1. Space steps beta = sqrt(0.03); % sqrt(0.003); sqrt(1/878); xa = 0; xb = 1; dx = 1/40; N = (xb-xa)/dx...

10 mesi fa | 0

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How do i solve non linear DE in matlab

%Here is the required ode45 code. clear variables close all xspan = [0 10]; y0 = 1; [t,y] = ode45(@(x,y)x.*y.^5+x.*cos(y)...

10 mesi fa | 1

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How to solve two differential equations using ode45.

Hi Ebraheem Is there anything specific that you want me to do for you?

oltre 2 anni fa | 0

why step size is divided by 50?

HI SK, Let say you have a function f (t) and you want to plot it between t = Tmin and Tmax, in matlab, you have to choose a ...

oltre 4 anni fa | 0

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how to solve an exponential equation with one unknown in matlab

Try the following code which uses Newton's method to find the root of the f(x) = 0. close all; clc; N = 50; ra = 9...

oltre 4 anni fa | 0

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Help with Coding problem

Try this function [J] = funtc(x_t,c,theta,M,N,L) J = zeros(1,L); for t = 1:L xs = 0 ; xp = 0 ; ...

oltre 4 anni fa | 0

how to plot fourier series in matlab

<</matlabcentral/answers/uploaded_files/121573/F-series.PNG>> Here is what your Fourirer series would like if my calculations...

oltre 4 anni fa | 2

I want to write a function that takes the output of one function and puts it into another. I am using the potential energy calculation of one equation and putting it into the kinetic energy of another but I am getting errors. I also need to plot it.

Here are simplified versions of your functions. function Ep = energy(k,x) % Calculates the potential energy ...

oltre 4 anni fa | 0

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Question on heat equation 1D Forward in Time Centered in Space

Here is an updated version of the code. I also used matlab pdepe function to validate the results which seem to agree with one a...

oltre 4 anni fa | 1

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I want to write a function that takes the output of one function and puts it into another. I am using the potential energy calculation of one equation and putting it into the kinetic energy of another but I am getting errors. I also need to plot it.

Are you trying to solve the equation Ep = Ek? Where Ep = mgh as the potential energy and Ek = 1/2mv^2 as kinetic energy. I see ...

oltre 4 anni fa | 0

How to plot discrete signals (delta equation)

Take a look at this code. It shows how to plot the sequences that you are given. n0 = 0; n1 = 1; n2 = -4; n = -5:5...

oltre 4 anni fa | 1

using ODE45 to solve simultaneously independent ODE's vs. calling the function twice - different results...

Answers have been inserted into your codes (I just modified them a bit). function Plot_odes T = 10; N = 1000; ...

oltre 4 anni fa | 0

Creating discrete-time model

Use this line of code to get a negative exponent. H = tf(P,Q,0.1,'variable','z^-1');

oltre 4 anni fa | 0

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Solving System Algebraic and Differential Equation

Here is a code that may help you get started. function First_oder_ode % Verify that your equations are implemented c...

oltre 4 anni fa | 0

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define a piecewise function whose parameters change on each segment

Check this link. It provides a vectorized method of implementing a piecewise function. <https://www.mathworks.com/matlabcentra...

oltre 4 anni fa | 0

How to write a sigma calculation

In part two of the problem, you will have to use the definition of the DTFT to compute X(omega). The resultant function is just ...

oltre 4 anni fa | 0

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How to plot the log to base 10 of absolute value of a function containing Sigma (Σ)

Try this code, it might help. clear all close all Nt = 100; Nx = 150; L = 2; a = .5; t = 0:4/(Nt-1):4; ...

oltre 4 anni fa | 0

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How to plot function from m file with vectors

If x is a vector (1×N), then F must be a function of x, write F = x.^2 in this case. Else if x is a matrix (2×N) containing tw...

oltre 4 anni fa | 0

Solve a system of Differential Equations with a piecewise function

Thanks for clearly formulating your problem;this is what drew my attention. It is very difficult to find a well stated problem a...

oltre 4 anni fa | 2

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Problem with graph MATLAB

Your code seems to be right, but the for loop is really not suitable in this case. However, there is a slight variation in the r...

oltre 4 anni fa | 1

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FFT implementation by myselft

It would be more efficient to use a vector form of the DFT for the coding in matlab. As an example, see below. Note that this m...

oltre 4 anni fa | 1

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Trying to write an ODE solver using Backward Euler with Newton-Raphson method

Here are two methods that you can use to code Euler backward formula. %% Method 1 clear variables close all a ...

oltre 4 anni fa | 0

Trying to write an ODE solver using Backward Euler with Newton-Raphson method

Alternatively, you can write a function. function [t,yb,h] = backwardEuler(a,b,N,M,y0,f,fx) h = (b-a)/N; t ...

oltre 4 anni fa | 0

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How to solve non linear second order differential equation with split boundary conditions?

Which method are you using to solve this problem? Are you using ode45, Runge kutta, or some other method like the finite differe...

oltre 4 anni fa | 0

Trying to write an ODE solver using Backward Euler with Newton-Raphson method

I would recommend you writing another function that does the differentiation separately. It would even be best if the function t...

oltre 4 anni fa | 0

I am doing runge kutta order 4 for a system of equations.Any bugs that giving me x1 and x2 =0 for all 200 values?

See this link, it might be helpful. <https://www.mathworks.com/matlabcentral/answers/386695-how-to-solve-this#answer_308949>

oltre 4 anni fa | 0

How to solve this?

function [t,x,y,N] = Runge4_2eqs(f1,f2,to,tfinal,xo,yo,h) N = ceil((tfinal-to)/h); x = zeros(1,N); ...

oltre 4 anni fa | 0

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