How can i delete every n-th row in a cell array

I have a cell array like C=cell(10,1). I want to delete every n-th row of the cell and have the result in a cell array with.

I have used

rowstodel=1:10

p(rowstodel(1),:)=[]; % delete first row

However, i want the resulting 9x1 results in a cell array. I have tried using a for loop but i keep getting 'matrix is out of range for deletion'

Thanks

Answer 1

[Image Analyst]

Try this:

C = cell(10,1) % Create a cell array (column vector) of 10 individual cells (empty ones).
whos C
% Delete very 3rd row starting at 1 by setting those rows to null.
% I.e. delete cells 1, 4, 7, and 10
% leaving only 6 cells in the cell array.
C(1:3:end) = []
whos C

you'll see:

C =

10×1 cell array

{0×0 double}

{0×0 double}

{0×0 double}

{0×0 double}

{0×0 double}

{0×0 double}

{0×0 double}

{0×0 double}

{0×0 double}

{0×0 double}

Name Size Bytes Class Attributes

C 10x1 80 cell

C =

6×1 cell array

{0×0 double}

{0×0 double}

{0×0 double}

{0×0 double}

{0×0 double}

{0×0 double}

Name Size Bytes Class Attributes

C 6x1 48 cell

See the FAQ:

https://matlab.fandom.com/wiki/FAQ#What_is_a_cell_array.3F

[Manu Mensa]

Hi.Image Analyst. Thank you for this. C(1:3:end) = [] overwrites the original C cell array which i still require to work with. i.e I have a 100 x 1 cell array (and each cell arry is (NX2)) which i need to analyze by excluding each row one at a time. I can exclude each one at a time by assigning a new variable to it but that would be very cumbersome.

e.g

C1=C(2:end,:) % excludes the first row, run analysis on C1

and i have also tried

rowstodel=1:100;

C(rowstodel(1),:)=[]; % deletes the first row but overwrites C to 99x1.

So, i need to get like a new cell array with each row deleted from C. Thanks in advance.

[Image Analyst]

So simply make a copy of it before you delete the rows:

C = cell(10,1) % Create a cell array (column vector) of 10 individual cells (empty ones).
whos C % Has 10 rows and one column.  Each element is a cell, which is empty so far.
% Delete very 3rd row starting at 1 by setting those rows to null.
% I.e. delete cells 1, 4, 7, and 10
% leaving only 6 cells in the cell array.
C2 = C; % Make a copy.
% Delete the rows from the copy.
C2(1:3:end) = []
whos C2

[Manu Mensa]

Thank you, Image Analyst.