Change indices without changing value for a spatially dependent variable

1 view (last 30 days)
Hi all, I have a question about how to change my coordinate system. I use a data file to create a spatially dependent variable (K_final) with my origin in the lower left hand corner; I would like to change the coordinate system to the center of the model grid at this location (69,250,12) using the current coordinate system (cells). Each cell is 0.25 m/cell. I have given a sample portion of the K_final in the attachment, the .dat file was too large to attach.
How do I go about changing the indices of the matrix without changing the values?
nx = 49; ny = 49; nz = 5; %the model uses 499x499x24 cells
k = 1; %counter
average_K = 8; %avg K
variance_K_high = 4;
variance_K_mid = 1;
variance_K_low = 0.25;
fidin=fopen('cond_1.dat'); %data file used to create spatially dependent variable.
K_final = zeros(nx,ny,nz); %attached below
for a=1:nx;
for b=1:ny;
for c=1:nz;
K_final(a,b,c) = average_K*exp((variance_K_low^0.5)*A(k,1));
Thanks, Eric

Answers (1)

Faiz Gouri
Faiz Gouri on 17 Aug 2017
Edited: Faiz Gouri on 17 Aug 2017
I understand that you would like to change indices in matrix without changing values. One possible way to do that would be to create a new matrix with extra size(based on how much distance you would like to move your origin) Refer this doc that explains about reshaping and re-sizing matrix.
You may need to copy each element from old matrix at a correspoding index in new matrix.


Find more on Data Types in Help Center and File Exchange

Community Treasure Hunt

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

Start Hunting!