# MATLAB 3D Finite different method using matlab

#### nnadiya

Can anyone show me how to solve the 3D diffusion equation which has been modeled into FDM by using matlab?

Related MATLAB, Maple, Mathematica, LaTeX, Etc News on Phys.org

#### Strum

Suppose your stencil only uses nearest and next nearest neighbors on a cubic periodic domain with N lattice points in each direction. Define Im = (1:N)-1;Im(Im==0)=N; and Ip = 2:N+1;Ip(Ip==N+1)=1; Define your system and matrices and use A(lp,lp,lm) $\sim A_{i+1,i+1,i-1}$ in your stencil.

#### nnadiya

Suppose your stencil only uses nearest and next nearest neighbors on a cubic periodic domain with N lattice points in each direction. Define Im = (1:N)-1;Im(Im==0)=N; and Ip = 2:N+1;Ip(Ip==N+1)=1; Define your system and matrices and use A(lp,lp,lm) $\sim A_{i+1,i+1,i-1}$ in your stencil.

Can I learn further from you?

#### Strum

You are sure you don't want to try yourself first? Also you haven't mentioned which time update algorithm you are using.

### Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving