using xls read to read value from column /row in a for loop

Hi everyone, i have a file of binary data(i.e. 0 and 1) only as , 128rows and 128 columns. all i want is my for loop to take one row or column at time and assign its value to key_out variable, and in next iteration it moves to 2nd row or column. Right now i have this code given below, but its not working fine, i will be very glad if someone can help me.

filename = 'binary.xlsx';
sheet=1;
key_out=xlsread(filename,sheet);
key_out=sprintf('%g', key_out); 
disp(key_out);
 key_out= reshape(key_out, [],128);
disp(key_out);
for j=1:128
    my_out=  masterkey (key_out);
    %two more functions will be executed here, for each 128 bits of j
end

Answer 1

[Cris LaPierre]

You need to specify row and column indices. Try this

for j=1:128
    my_out=  key_out(:,j); % extracts the jth column
end

Answer 2

[KALYAN ACHARJYA]

You can do the same without Loop also (Using Cell Array)

• Saving all Rows as key blocks

key_blocks=mat2cell(binary_data,1*ones(1,128),128);

• Or Saving all Cloumns data as key blocks

key_blocks=mat2cell(binary_data,128,1*ones(1,128));

Later you call any data from cell array using key_blocks{row/column number}