How to loop through excel sheets, perform calculations, and compile results - excel

Question

I have roughly 70,000 sheets that all have to have calculations done, and then all results compiled into a new sheet (which would be 70,000 lines long).
It needs to be sorted by date.
I'm VERY very very poor at matlab, but I've what I need the script to do for each excel sheet, I'm just unsure how to make it do them for all.
Thank you!!! (I took out some of the not important code)
%Reading in excel sheet
B = xlsread('24259893-008020361800.TorqueData.20160104.034602AM.csv');
%Creating new matrix
[inYdim, inXdim] = size(B);
Ydim = inYdim;
[num,str,raw]=xlsread('24259893-008020361800.TorqueData.20160104.034602AM.csv',strcat('A1:C',num2str(Ydim)));
%Extracting column C
C=raw(:,3);
for k = 1:numel(C)
if isnan(C{k})
C{k} = '';
end
end
%Calculations
TargetT=2000;
AvgT=mean(t12);
TAcc=((AvgT-TargetT)/TargetT)*100 ;
StdDev=std(B(ind1:ind2,2));
ResTime=t4-t3;
FallTime=t6-t5;
DragT=mean(t78);
BreakInT=mean(t910);
BreakInTime=(t10-t9)/1000;
BreakInE=BreakInT*BreakInTime*200*.1047;
%Combining results
Results=[AvgT TAcc StdDev ResTime FallTime DragT BreakInT BreakInTime BreakInE]
I think I need to do something along the lines of:
filenames=dir('*.csv')
and I found this that may be useful:
filenames=dir('*.csv');
for file=filenames'
csv=load(file.name);
with stuff in here
end

Answer 1

You have the right idea, but you need to index your file names in order to be able to step through them in the for loop.
FileDir = 'Your Directory';
FileNames = {'Test1';'Test2';'Test3'};
for k=1:length(FileNames)
file=[FileDir,'/',FileNames{k}]);
[outputdata]=xlsread(file,sheet#, data locations);
THE REST OF YOUR LOOP, Indexed by k
end
How you choose to get the file names and directory is up to you.