substract and make answer to write as an output file

Please anyone who can understand to this problem let me know the solution.

Your kind support is highly appreciated

all these files are 200x200 matrices.

fdir1 = 'depth'; % this is the initial file.

I want to substract above file from all the other depth files 'depth_00001' to 'depth_03600' and write the output as 'slide_00001' to 'slide_03600'.

fdir1 = 'D:/Mejena_Case/NHWAVE_DeformSlide_ReducedArea/results_orig/';

fdir2 = 'D:/Mejena_Case/NHWAVE_DeformSlide_ReducedArea/results_orig/';

ini_depth_file = fdir1;

% load the initial depth file

dep_init = load([ini_depth_file 'depth']);

% given name for the depth file want to read

slide_dep_file = fdir2;

% load the required depth file

depth_data = load([slide_dep_file 'depth_00139']);

% read the the load files in fdir1 and fdir2

dep_init = readmatrix([ini_depth_file 'depth']);

depth_data = readmatrix([slide_dep_file 'depth_00139']);

% operation function

slide = (depth_data-dep_init);

% save the output file in to the same directory

writematrix(slide, "slide_00139.txt", "Delimiter",',');

type("slide_00139.txt")

[Shivam]

Hi,

Can you attach the files using the paperclip icon? And, do you just want the matrix subtraction?

[幸一]

yes matrix substraction

[幸一]

i will attach few files

[幸一]

please check the attached files to this thread

[幸一]

hello matlab community.

Anybody know the answer for this please?

Answer 1

[Ayush]

Hi @幸一

You can use a loop to iterate through the file names, load the matrices, perform the subtraction, and then save the result. Here's a code snippet that should accomplish what you described:

% Define the directory where the files are located
directory = './'; % Adjust this if your files are in a different directory

% Load the initial file
initial_file = 'depth.mat';
initial_data = load(fullfile(directory, initial_file));
initial_matrix = initial_data.depth; % Assuming the matrix is saved under the variable 'depth'

% Iterate through the depth files and perform the subtraction
for i = 1:3600
    % Generate the file names
    depth_file_name = sprintf('depth_%05d.mat', i);
    slide_file_name = sprintf('slide_%05d.mat', i);
    
    % Load the current depth file
    depth_data = load(fullfile(directory, depth_file_name));
    depth_matrix = depth_data.depth; % Assuming the matrix is saved under the variable 'depth'
    
    % Subtract the initial matrix from the current depth matrix
    slide_matrix = depth_matrix - initial_matrix;
    
    % Save the result to a new file
    save(fullfile(directory, slide_file_name), 'slide_matrix');
end

% Note: The above code assumes that the matrix variable inside each .mat file is named 'depth'.
% If the variable has a different name, adjust the code accordingly.

Thanks,

Ayush

[幸一]

thank you very much sir.

great help you gave me to save my time.

Because, I am very new to matlab. Previously I never used this program.

[幸一]

hello sir,

I tried your suggesstion, but unfortunately it is not working.