Subscripted assignment dimension mismatch.

good after noon everyone! please help me in this error i need to create a data base to 500 images all of dimension 100x100 and to compare it with another image of the same dimension when creating the database i use

for i=1:500    
    dataBase(i,:)=['Images/Database/' int2str(i) '.jpg '];         
end        
save Database

however the code only reads the first 9 images then display the following error * *

Subscripted assignment dimension mismatch.

Error in DB(line 3)
        dataBase(i,:)=['Images/Database/' int2str(i) '.jpg '];* *

and the dataBase appears as 9x22 double i=10

please help me thanks

Answer 1

[Image Analyst]

You need to have a cell array, unless you use sprintf('%3.3d') to create your string in which case you can use a character array like you're trying.

dataBase(i) = {sprintf('Images/Database/%d.jpg', i)};

That creates a cell - the i'th cell of database - where the contents of the cell are the filename string. Please read this: http://matlab.wikia.com/wiki/FAQ#What_is_a_cell_array.3F

Like I said you might be able to create a character array if you use 3.3d to ensure that all strings are the same length and thus the character array will be perfectly rectangular.

dataBase(i, :) = sprintf('Images/Database/%3.3d.jpg', i);

I did not test the above line of code. Also, to use it you'd definitely need to preallocate an array with the right number of columns

database = zeros(500, 23);

Answer 2

[Matt J]

Since your strings have different lengths, you should hold them in a cell array,

 for i=1:500

    dataBase{i}=['Images/Database/' int2str(i) '.jpg '];

 end

To hold them as a char array, you would have to pad the strings with spaces to make them of equal length. The char() command can do this, but it is questionable how essential this is for you.

[Matt J]

Nour Mawla commented:

Mr. Matt J, thank you for your response however it didn't work the dataBase appeared as 1x500 cells and it gives an error when running the comparing function what i need is a dataBase 500x22 char Thanks

[Image Analyst]

Then see the second half of my reply.

[Matt J]

Once you have the cell array, you can convert as follows,

dataBase=char(dataBase)

[Nour Mawla]

thanks Mr. Matt J I will test it now, really really thanks for your help and your time i appreciate it so much....love you <3

Answer 3

[Nour Mawla]

Ms. Image Analyst Thank you Thank you THANK YOU <3 <3 It worked like magic really thanks I LOVE YOU SOOOO MUCH :*