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回答済み
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^...
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^...
3年弱 前 | 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]; ...
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]; ...
3年弱 前 | 0
回答済み
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 ...
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 ...
3年弱 前 | 0
回答済み
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...
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...
3年弱 前 | 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)...
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)...
3年弱 前 | 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?
How to solve two differential equations using ode45.
Hi Ebraheem Is there anything specific that you want me to do for you?
4年以上 前 | 0
回答済み
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 ...
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 ...
約6年 前 | 0
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回答済み
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...
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...
6年以上 前 | 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 ; ...
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 ; ...
6年以上 前 | 0
回答済み
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...
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...
6年以上 前 | 2
回答済み
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 ...
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 ...
6年以上 前 | 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...
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...
6年以上 前 | 1
| 採用済み
回答済み
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 ...
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 ...
6年以上 前 | 0
回答済み
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...
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...
6年以上 前 | 2
回答済み
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; ...
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; ...
6年以上 前 | 0
回答済み
Creating discrete-time model
Use this line of code to get a negative exponent. H = tf(P,Q,0.1,'variable','z^-1');
Creating discrete-time model
Use this line of code to get a negative exponent. H = tf(P,Q,0.1,'variable','z^-1');
6年以上 前 | 0
| 採用済み
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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...
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...
6年以上 前 | 0
| 採用済み
回答済み
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...
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...
6年以上 前 | 0
回答済み
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 ...
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 ...
6年以上 前 | 0
| 採用済み
回答済み
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; ...
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; ...
6年以上 前 | 0
| 採用済み
回答済み
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...
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...
6年以上 前 | 0
回答済み
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...
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...
6年以上 前 | 2
| 採用済み
回答済み
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...
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...
6年以上 前 | 1
| 採用済み
回答済み
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...
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...
6年以上 前 | 1
| 採用済み
回答済み
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 ...
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 ...
6年以上 前 | 0
回答済み
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 ...
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 ...
6年以上 前 | 0
| 採用済み
回答済み
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...
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...
6年以上 前 | 0
回答済み
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...
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...
6年以上 前 | 0
回答済み
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>
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>
6年以上 前 | 0
回答済み
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); ...
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); ...
6年以上 前 | 0
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