# Thomas TJOCK-MBAGA

Last seen: 27 days ago Active since 2022

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Use polyspace to open or write .m files
Hello, please my MATLAB does not lunch since 2 weeks, but i also have polyspace for the same MATLAB version. I would like to kno...

7 months ago | 1 answer | 0

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Question

Boundary using system of pdepes
I have the following pdes systèmes wirh four membres:R_j*dC_j/dt = 1000*(1+0.0025*x)^2 - 100*(1+0.0025*x) - R_j*C_j + R_(j-1)*C_...

8 months ago | 0 answers | 0

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Question

Solving a system of equtions with first an pde and the others first order odes
Now i have the same system but with the first equation be a PDE i would like to solve it pdepe solver and using ode45 ...

8 months ago | 1 answer | 0

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Question

Solving system of odes with a power using ode45
I have the following system of first order ode i would like to solve it using ode45 1) dX/dt = -0.000038*X - (X*(X/Xinit)^frac)...

8 months ago | 2 answers | 0

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Matlab code for numerical inversion of Laplace concentration and plot curve : concentration versus Time, Space and both
I have the following code but it work only for time dependant function. I would like to modify it toi take into account the spac...

8 months ago | 0

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Matlab code for numerical inversion of Laplace concentration and plot curve : concentration versus Time, Space and both
0 I obtained a concentration on a solute in 1D transport using the Laplace transform with respect to Time. I would like to nu...

8 months ago | 1 answer | 0

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Question

Need surf and contourn for semi-analytical solution for 1D ADE
I have the following MATLAB code and additional function uses in the main programm. I would like to modify the main programm (Sc...

9 months ago | 0 answers | 0

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MATLAB numerical or analytical code for fractional ADE
I have the following ADE with caputo Time fractional derivative. I would like to obtain the concentration C, but i dont have any...

12 months ago | 0 answers | 0

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Question

Need help for manipuling Matrix
I have a MATLAB CODE of Carr download from https://github.com/elliotcarr/Carr2021a. In this programm a couples multispecies in m...

1 year ago | 0 answers | 0

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Question

Please i recive the following message "No licence avalaible for Polyspace C COP product''? After enter the product'' license of MATLAB 2020a?
After the installation of MATLAB 2020 a, i run the Polyspace ans windows Ask me first to ti activite MathWorks Software. But Aft...

1 year ago | 1 answer | 0

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Question

Plotting a 3D finition with 1D implicite variable
Hello! I have a 3D advection-dispersion équation as follows: dC/dt = Dx *d^2C/dx^2 + Dy *d^2C/dy^2 + Dz *d^2C/dz^2 - vx *dC/dx -...

2 years ago | 0 answers | 0

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Question

Error appear when triying to solve a system of ODES
I want to solve the following coupled ODEs attached here. But the following error appears Invalid MFX-file

2 years ago | 1 answer | 0

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Question

Solve analytically an system of coupled diffrential équation with Matlab
I would like to solve analytically the following system of coupled 5 ODES in order one. A(dT/dt)+ B*T = G.I tried to solve it it...

2 years ago | 1 answer | 0

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Question

Need MATLAB program for 2DFATMIC code for 1D reactant solute transport with distance dépend flow and dispersion and a pulse injection
I would like to applied the 2DFATMIC code to one-dimensional advection-dispersion transport with variable velocity flow and disp...

2 years ago | 0 answers | 0

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Question

WhatsApp can i do to plot the fonction below respect to the variables x and t
When i run the code the following error apear Index exceeds Matrix dimension

2 years ago | 1 answer | 0

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Question

Hello everyone please I have a problem. How to declare a function with two variables in MATLAB and plot the evolution according to one variable after having fixed the other ??
Hello everyone please I have a problem. How to declare a function with two variables in MATLAB and plot the evolution according ...

2 years ago | 2 answers | 0

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I want to simulate the following programme on pdepe solver with third type inlet boundary of Heaviside nature with t0 = 140 days and a zero flux ourlet boundary
Yes this is the boundary condition in the inlet that i wanted to set but written as follow -0.6*dC/dx + 0.71*C = C0 And un the...

2 years ago | 0

Question

I want to simulate the following programme on pdepe solver with third type inlet boundary of Heaviside nature with t0 = 140 days and a zero flux ourlet boundary
fonction [p1, q1, pr, qr]= pdex1bc (x1, u1, xr, ur) P1 =1; q1 = 1; pr = 0.71*(1+0.2*1)*Ur; qr = 1;

2 years ago | 2 answers | 0