Hope to gather last rows from each submatrices

I hope to gather last lines from each submatrix.

- I have 17 x 20 submatrices in matrix name A.

- Each submatrices have different number of lines, but same number of columns (total 7 columns, all)

- I tried to generate a file, made up of only last rows of each submatrices. My target file's from will be

             M = [column1 column2 column3 column4 column5 column6 column7] 
             % made up of last rows of each submatrices, unknown number of
             lines, 7 columns

- So I tried

             for x_cc = 1:20
                 for y_cc = 1:17
                      M = A{x_cc, y_cc}(end,:);
                 end
             end

- But it is not working, giving the error Subscript indices must either be real positive integers or logicals.

- Should I need to define the size first? What operation should be done? or what commands are useful? I tried cellfun, but not sure how can I use here.

- Need any help to solve this situation. Thanks~!

[Walter Roberson]

Did you accidentally define a variable named "end" ?

[Walter Roberson]

In the output, should it first go down the first column of submatrices of A, or across the first row of submatrices of A ?

[exsonic]

Thanks Walter,

1) No, I used "end" because I hope to gather only last rows, so I used (end,:)

2) I could not clearly understand the 2nd question.. I hope to "stack up" the last rows of the each submatrices, in the matrix M.

[Walter Roberson]

Stack in what order? If your A is

P Q
R S

then do you want the last lines in the order

P
Q
R
S

or in the order

P
R
Q
S

[exsonic]

Order is not important, hope to just stack the last lines of each cell array of matrix.

I have

A =  
    [0x7 double]    [10x7 double]    [ 9x7 double]    
    [4x7 double]    [ 5x7 double]    [ 6x7 double]
    ....

Hope to choice only last lines from each arrays, and stack in the single matrix.

There are empty cells are exists, hope to just get 0 in that case.

Answer 1

[Walter Roberson]

AT = A(~cellfun(@isempty,A));
M = cellfun( @(C) C(end,:), AT);

[exsonic]

Great thanks~! I really need to study cellfun more~!

[Walter Roberson]

If you are certain of not having empty submatrices, you can reduce to

M = cellfun( @(C) C(end,:), A(:));