# Hi , all there , i have an excel file that i want to split it by special element value in the file to some files . how can i make it possoble with matlab

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frank on 3 Mar 2023
Commented: Mathieu NOE on 6 Apr 2023
The initial excel file is composed of 5678 rows and 4 columns. what i want is to split it to some subfiles according to particular principle . for example '0' in a row
how should i do it in matlab ?
THX
Frank
Jan on 3 Mar 2023
What have you tried so far? Can you import the file already? Then the input is a matrix already and you can omit the "initial excel file" part.

Mathieu NOE on 6 Mar 2023
hello
try this
I created first a dummy array with some zeros at lines 25 / 75 / 85
so the for loop will split the data with rows going from 1 to 24 then 25 to 74 , 75 to 84 , 85 to end of array (100th row)
each individual array is stored in a separate excel file
hope this helps
%% 1/ create some dummy data and store in a excel file
A = rand(100,5);
A(:,1) = (1:100)';
% create some specific (0) values
target_val = 0;
A(25,3) = target_val;
A(75,2) = target_val;
A(85,5) = target_val;
writematrix(A,"dummy.xlsx");
%% 2/ main code
[m,n] = size(B);
tol = 1e-6; % define tolerance
[r,c] = find(abs(B-target_val)<tol);
r = sort(r); % sort r in ascending order
rr = [1;r;m+1];
for ci = 1:numel(rr)-1
start_row = rr(ci)
stop_row = rr(ci+1)-1
data = B(start_row:stop_row,:); % extract rows
filename_out = ['out' num2str(ci) '.xlsx'];
writematrix(data,filename_out);
end
Mathieu NOE on 6 Apr 2023
hello
problem solved ?

Star Strider on 6 Mar 2023
To begin a new sub-array whenever a zero appears in any row, this works —
M = randi([0 20], 15, 4)
M = 15×4
0 3 5 8 7 7 0 2 15 17 3 6 1 9 18 9 7 8 4 16 7 8 0 10 20 11 16 7 11 0 7 14 0 7 13 0 20 14 14 5
ZeroInRow = any(M==0,2); % Returns 'true' For Any Row With A '0'
Idx = cumsum(ZeroInRow); % Define Grouped Rows By Cumulative Sum
[Lb,Ub] = bounds(Idx); % Number Of Instances Of Rows With '0'
StartIdx = Lb;
for k = Lb:Ub
cidx = k-StartIdx+1;
C{cidx,:} = M(Idx==k,:); % Create Cell Array Of Submatrices Matching Condition
end
C
C = 5×1 cell array
{[ 0 3 5 8]} {4×4 double } {2×4 double } {[11 0 7 14]} {7×4 double }
.