you can store your data in a cell array. just export the date in excel using range. and you are indexing upto k=14. but you have k*col =154 data.
A=load('matlab1.mat');
data_sweep=A.data_sweep;
avgwin = 5;
[row col]=size(data_sweep);
N = size(data_sweep,1);
k = floor(N/avgwin);
C=cell(floor(N/avgwin),size(data_sweep,2));
C1=cell(floor(N/avgwin),size(data_sweep,2));
for i = 1: k*col
p = avgwin*i -(avgwin-1);
y= data_sweep(p:p+(avgwin-1));
C{i}= mean(y); %the mistake is here, I guess
C1{i} = std(y);
end
matrix=[C{:}];
mean_y=reshape(matrix,14,11);
matrix1=[C1{:}];
sd_y=reshape(matrix1,14,11);
x = (0:10:100);
Mean_Data=[x;mean_y];
Sd_Data=[x;sd_y];
writematrix(Mean_Data,'M.xls','Sheet',1,'Range','A1:K20')
writematrix(Sd_Data,'M.xls','Sheet',1,'Range','M1:W20')
