write node to cell center

i have 72 node ( 1, ...,72 )

each node have a value between 0-1

i want calculate average each node become 1 cell

i know the coordinate (geometry ) of my cell and node

how to make it simple without manual input

[KSSV]

Use mean to get average. What you want is not clear from the file attached.

[vaya putra]

i have grid 5x5x1 so total cells 25 and node 72.

i coupling another simulation that he's output is in node

according to FVM cell center,

example

for cell no 1 have number of node 0 1 10 11 36 37 46 47

cell no 2 have number of node 1 2 9 10 37 38 45 46

assume each node has value

node 0 = 0.5

node 1 = 1

node 10 = 0.2 etc

so i can define value in cell center is (0.5+1+0.2+...)/8

[KSSV]

You can use mean right?

[vaya putra]

for 25 cell its okay

but next i have 1000 cells, so its impossible if by manual input. this is using VTK Unstructurd grid

Answer 1

[KSSV]

I got the problem..I think you want to do the following.

A = xlsread('NODETOSELL.csv') ;   % read the file 

node_vals = A(:,3) ;   % node values 
cells = A(:,7) ;       % cells 
nodes = A(:,8:15) ;    % respective nodes in cells 
% Remove the nans 
cells(isnan(cells(:,1)),:) = [] ;   % remove the nans in the cells (this is due to your file pattern)
nodes(isnan(nodes(:,1)),:) = [] ;   % remove the nans in the cells (this is due to your file pattern)
% GEt the average 
N = length(cells) ; 
iwant = zeros(N,1) ; 
for i = 1:N
    iwant(i) = mean(node_vals(nodes(i,:)+1)) ; % i is added because, node has 0, and MATLAB index starts with 1
end