When I open a images and add them into a class the db.mat shows only the latest image details and other image details are missing. Can you please explain what I have missed in the code?

[fname path]=uigetfile('.jpg','Open a face as input for training');
fname=fulfile(path,fname);
im=imread(fname);
imshow(im);
title('Input image');
c=input('Enter the Class (Number from 1-10)','s');
%%Feature extraction
F=FeatureStatistical(im);
try
    load db;
    F = [F c];
    db = [db;F];
    F = [m s];
    save db.mat db
catch
    db=[F c]; % 10 12 1
    save db.mat db
end
function [F]=FeatureStatistical(im)
im=double(im);
m=mean(im(:));
s=std(im(:));
F=[m s];
end

Answer 1

[Kojiro Saito]

I think you need to change try-cacth statetments. Leave only load db code. And I guess you need to convert charcter c to double so that concat works fine.

try
    load db;
catch
    db = [];
end
F = [F str2double(c)];
db = [db;F];
save db.mat db

[Upeshala Hirimuthugoda]

Thank you. But here I get the error message "Error using vertcat

Dimensions of arrays being concatenated are not consistent."

in the line "db = [db;F];"

[Kojiro Saito]

Did you delete db.mat file first and run the script?

[Upeshala Hirimuthugoda]

Yes, I did.

[Kojiro Saito]

In my environment, it works with no errors. What the size of F and db?

size(F)

it returns [1 3] ?

And

size(db)

returns [n 3] ? (n is integer such as 1, 2 and so on.)