How to read several excel files (30 files) without repeating the program?

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Hi Everyone;
I just wrote a program to read from one excel file and then calculate something by using the column data. Now I want to extend it to read 30 excel files and do exactly the same thing (I mean calculate same column in each files). The question is I have to copy all the program and change the name of each line which is too difficult so I wonder to know if another way that I can examine. Could you please help me?

Accepted Answer

Image Analyst
Image Analyst on 19 Dec 2012
Ara: Here is an example of how to use ActiveX with Excel (get xlswrite1 from the FileExchange, then save code below as ExcelDemo.m and run):
% Demo macro to write numerical arrays and cell arrays
% to two different worksheets in an Excel workbook file.
% Uses xlswrite1, available from the File Exchange
% http://www.mathworks.com/matlabcentral/fileexchange/10465-xlswrite1
function ExcelDemo
clc;
close all;
clear all;
fullFileName = GetXLFileName();
if isempty(fullFileName)
% User clicked Cancel.
return;
end
Excel = actxserver('Excel.Application');
% Prepare proper filename extension.
% Get the Excel version because if it's version 11 (Excel 2003) the file extension should be .xls,
% but if it's 12.0 (Excel 2007) then we'll need to use an extension of .xlsx to avoid nag messages.
excelVersion = str2double(Excel.Version);
if excelVersion < 12
excelExtension = '.xls';
else
excelExtension = '.xlsx';
end
% Determine the proper format to save the files in. It depends on the extension (Excel version).
switch excelExtension
case '.xls' %xlExcel8 or xlWorkbookNormal
xlFormat = -4143;
case '.xlsb' %xlExcel12
xlFormat = 50;
case '.xlsx' %xlOpenXMLWorkbook
xlFormat = 51;
case '.xlsm' %xlOpenXMLWorkbookMacroEnabled
xlFormat = 52;
otherwise
xlFormat = -4143;
end
if ~exist(fullFileName, 'file')
message = sprintf('I am going to create Excel workbook:\n\n%s\n\nClick OK to continue.\nClick Exit to exit this function', fullFileName);
button = questdlg(message, 'Creating new workbook', 'OK', 'Exit', 'OK');
drawnow; % Refresh screen to get rid of dialog box remnants.
if strcmpi(button, 'Exit')
return;
end
% Add a new workbook.
ExcelWorkbook = Excel.workbooks.Add;
% Save this workbook we just created.
ExcelWorkbook.SaveAs(fullFileName, xlFormat);
ExcelWorkbook.Close(false);
else
% Delete the existing file.
delete(fullFileName);
end
% Open up the workbook named in the variable fullFileName.
invoke(Excel.Workbooks,'Open', fullFileName);
Excel.visible = true;
% Create some sample data.
myData = magic(20);
myOtherData = rand(10);
% Then run the new xlswrite1 function as many times as needed or in a loop
% (for example xlswrite1(fullFileName, yourArrayName, XL_CellLocation).
% IMPORTANT NOTE: the Excel object variable MUST exist in the routine that calls xlswrite1()
% and it MUST be named "Excel" EXACTLY because xlswrite1() has this line it it:
% Excel = evalin('caller', 'Excel');
xlswrite1(fullFileName, myData, 'mySheetName', 'B2');
ca = {'Column Header 1', 'Column Header 2'};
xlswrite1(fullFileName, ca, 'mySheetName', 'B1');
ca = {'Row Header 1'; 'Row Header 2'};
xlswrite1(fullFileName, ca, 'mySheetName', 'A2');
xlswrite1(fullFileName, myOtherData, 'myOtherSheetName', 'B2');
% Delete all empty sheets in the active workbook.
DeleteEmptyExcelSheets(Excel);
% For fun, add comments to cells A1:A12 on sheet #1.
worksheets = Excel.sheets;
thisSheet = get(worksheets, 'Item', 1);
for k = 1 : 12
myComment = sprintf('Comment for cell A%d', k);
cellReference = sprintf('A%d', k);
theCell = thisSheet.Range(cellReference);
theCell.AddComment(myComment);
end
% Then run the following code to close the activex server:
invoke(Excel.ActiveWorkbook,'Save');
Excel.Quit;
Excel.delete;
clear Excel;
message = sprintf('Done!\nThis Excel workbook has been created:\n%s', fullFileName);
msgbox(message);
% End of main function: ExcelDemo.m -----------------------------
%--------------------------------------------------------------------
% Gets the name of the workbook from the user.
function fullExcelFileName = GetXLFileName()
fullExcelFileName = []; % Default.
% Ask user for a filename.
FilterSpec = {'*.xls', 'Excel workbooks (*.xls)'; '*.*', 'All Files (*.*)'};
DialogTitle = 'Save workbook file name';
% Get the default filename. Make sure it's in the folder where this m-file lives.
% (If they run this file but the cd is another folder then pwd will show that folder, not this one.
thisFile = mfilename('fullpath');
[thisFolder, baseFileName, ext] = fileparts(thisFile);
DefaultName = sprintf('%s/%s.xls', thisFolder, baseFileName);
[fileName, specifiedFolder] = uiputfile(FilterSpec, DialogTitle, DefaultName);
if fileName == 0
% User clicked Cancel.
return;
end
% Parse what they actually specified.
[folder, baseFileName, ext] = fileparts(fileName);
% Create the full filename, making sure it has a xls filename.
fullExcelFileName = fullfile(specifiedFolder, [baseFileName '.xls']);
% --------------------------------------------------------------------
% DeleteEmptyExcelSheets: deletes all empty sheets in the active workbook.
% This function looped through all sheets and deletes those sheets that are
% empty. Can be used to clean a newly created xls-file after all results
% have been saved in it.
function DeleteEmptyExcelSheets(excelObject)
% excelObject = actxserver('Excel.Application');
% excelWorkbook = excelObject.workbooks.Open(fileName);
worksheets = excelObject.sheets;
sheetIdx = 1;
sheetIdx2 = 1;
numSheets = worksheets.Count;
% Prevent beeps from sounding if we try to delete a non-empty worksheet.
excelObject.EnableSound = false;
% Loop over all sheets
while sheetIdx2 <= numSheets
% Saves the current number of sheets in the workbook
temp = worksheets.count;
% Check whether the current worksheet is the last one. As there always
% need to be at least one worksheet in an xls-file the last sheet must
% not be deleted.
if or(sheetIdx>1,numSheets-sheetIdx2>0)
% worksheets.Item(sheetIdx).UsedRange.Count is the number of used cells.
% This will be 1 for an empty sheet. It may also be one for certain other
% cases but in those cases, it will beep and not actually delete the sheet.
if worksheets.Item(sheetIdx).UsedRange.Count == 1
worksheets.Item(sheetIdx).Delete;
end
end
% Check whether the number of sheets has changed. If this is not the
% case the counter "sheetIdx" is increased by one.
if temp == worksheets.count;
sheetIdx = sheetIdx + 1;
end
sheetIdx2 = sheetIdx2 + 1; % prevent endless loop...
end
excelObject.EnableSound = true;
return;
  7 Comments

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More Answers (3)

Walter Roberson
Walter Roberson on 19 Dec 2012

Mark Whirdy
Mark Whirdy on 19 Dec 2012
Edited: Mark Whirdy on 19 Dec 2012
Hi Ara, what does "change the name of each line" mean? Can you provide some sample code to help would-be assisters understand the problem more clearly? Generally, the more effort you put into the question, the better the answer you'll get.
My guess is that you want to loop through a cell-array of excel filenames, opening each file in turn and reading in its contents ... is this right?
myPath = 'C:\';
myFileArray = {'myfile1.xlsx';'myfile30.xlsx'};
exl = actxGetRunningServer('Excel.Application');
exlWkbks = exl.Workbooks;
for i = 1:size(myFileArray,1)
tempWkbook = exlWkbks.Open(fullfile(myPath,myFileArray{i,:}));
tempSheet = tempWkbook.ActiveSheet;
tempArray = tempSheet.Range('A1:A100').Value;
tempWkbook.Close;
% myVector = cell2mat(tempArray)*2; % PERFORM SOME OPERATION HERE
end
besides this, google "matlab excel actxserver"
  5 Comments
Ara
Ara on 19 Dec 2012
Edited: Ara on 19 Dec 2012
I used round brackets, but still doesn't work. And I also read the link you send me and am trying to adapt my code with the code you wrote me but I couldn't. Could you please look at my program? I should have changed Excel.Application?
??? Error using ==> actxGetRunningServer
The server 'Excel.Application' is not running on this system.

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Azzi Abdelmalek
Azzi Abdelmalek on 19 Dec 2012
fic=struct2cell(dir('yourfolder/*.xls'))
file=fic(1,:)
for k=1:numel(file)
data{k}=xlsread(file{k})
end
  6 Comments
Ara
Ara on 19 Dec 2012
No, I am not insistent on using xlsread. I just do not know how to use ActiveX code and how to adapt it with my code that was why I asked you the demo. Sorry, if any misunderstood happens.

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