MATLAB Answers

Need to find difference in maximum and minimum concentration

3 views (last 30 days)
Dinesh Kumar
Dinesh Kumar on 29 May 2020
Answered: Dinesh Yadav on 2 Jun 2020
In below given script i need to find difference in maximum and minimum concentration at t=0 time stamp. what change i need in given script.
c = 1:32; % initial concentration gradient (mol/(m^2*s))
D = 2; % diffusivity (m^2/s)
dt = 0.1; % time step (s)
dx = 1; % x step (m)
for k = 0:1000,
% finite-difference diffusion using explicit method, central differences
c = c + D*dt/(dx^2)*([c(2:end) c(end)] - 2*c + [c(1) c(1:end-1)]);
% The MATLAB *plotting* code presented in the lesson does not work inside the Jupyter-notebook
% Octave environment. Instead of using the "image" command, we need to "fill" individual boxes.
vertices = [0 0; 1 0; 1 1; 0 1];
if mod(k,100) == 0, % plot a snapshot
for m = 1:length(c),
fill(vertices(:,1)+m, vertices(:,2)-k/100,c(m)); hold on
caxis([1 32])
h = ylabel(sprintf('t = %gs ',k*dt));
set(gca,'ytick',[],'xticklabel',[],'ticklength',[0 0]); grid on
xlabel('x location'); text(16,-14.25,'Diffusion example','horizontalalignment','center');


Sindar on 31 May 2020
what happens when you try? An error or an answer you think is wrong? Regardless, can you share the code you tried?

Sign in to comment.

Answers (1)

Dinesh Yadav
Dinesh Yadav on 2 Jun 2020
As Darova pointed out just use
minConc = min(c);
maxConc = max(c);
to get minium and maximum concentration at t = 0. And its working I tried with your code itself. Make sure you are not overwriting minimum and maximum concentration computed at t=0 as your loop is running for 1001 times.


Sign in to comment.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!