subtraction on the cells elements

i have a cell array x of size 12*1

and the cells are column vectors of type double

x{1,1}=[1  2  5  6  7  7  8 ];
x{2,1}=[ 1 2  6  6  7  8  8]

and so on

i want the output y as a cell array with

y{1,1}=[1 1 3 1 1 0 1];
y{2,1}=[1 1 4 0 1 1 0];

the elements of the cell in the output should be the difference i-(i-1). let the first element be as it is it. start with i =2:length x{i,1}

for each each cell the operation shouldbe done and stored in a different cell

[johnson saldanha]

acc={}
for i=1:size(out,1)
   y=out{i,1};
   for i=2:length(y)
     acc(i)=y(i)-y(i-1);
   end
   acc{i,1}=num2cell(acc);
end

Conversion to cell from double is not possible.
Error in accelerationrate (line 66)
     acc(i)=y(i)-y(i-1);

i tried this and im getting this error.

Answer 1

[Guillaume]

Note that [1 2 5 6 7 7 8 ] in your example is a row vector, not a column vector as you state. If the content of the cells are indeed column vectors then you'll have to change the , into ; where indicated

%demo data
x = num2cell(randi(10, 12, 10), 2)

%processing
y = cellfun(@(vec) [vec(1), diff(vec)], x, 'UniformOutput', false)  %replace [vec(1), by [vec(1); if working on column vectors

or if you want to use a loop instead of cellfun:

y = cell(size(x));  %preallocation
for idx = 1:numel(x)
    y{idx} = [x{idx}(1), diff(x{dix})];  %replace , by ; for column vectors
end

[johnson saldanha]

ifi have to make the first row in every cell element as 0 how do i do it

[Guillaume]

Replace vec(1) or x{idx}(1) by 0.