How to delete data in excel file from Guide? Thanks!
MATLAB: How to delete data in excel file
delete dataexcel
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Arnaud, below is my code for inserting comments. I make up a cell array of strings, instantiate Excel, and call this function.
%---------------------------------------------------------------------------------------------
% Add comments to cells on sheet.
% Sometimes this throws exception #0x800A03EC on the second and subsequent images. It looks like this:
% "Error: Object returned error code: 0x800A03EC"
% It is because of trying to insert a comment for a worksheet cell when a comment already exists for that worksheet cell.
% So in that case, rather than deleting the comment and then inserting it, I'll just let it throw the exception
% but I won't pop up any warning message for the user.
function InsertComments(Excel, caComments, sheetNumber, startingRow, startingColumn)try worksheets = Excel.sheets; % thisSheet = get(worksheets, 'Item', sheetNumber);
thisSheet = Excel.ActiveSheet; thisSheetsName = Excel.ActiveSheet.Name; % For info only.
numberOfComments = size(caComments, 1); % # rows
for columnNumber = 1 : numberOfComments columnLetterCode = cell2mat(ExcelCol(startingColumn + columnNumber - 1)); % Get the comment for this row.
myComment = sprintf('%s', caComments{columnNumber}); % Get a reference to the cell at this row in column A.
cellReference = sprintf('%s%d', columnLetterCode, startingRow); theCell = thisSheet.Range(cellReference); % You need to clear any existing comment or else the AddComment method will throw an exception.
theCell.ClearComments(); % Add the comment to the cell.
theCell.AddComment(myComment); end catch ME errorMessage = sprintf('Error in function InsertComments.\n\nError Message:\n%s', ME.message); fprintf(errorMessage); uiwait(warndlg((errorMessage));endreturn; % from InsertComments
See my demo:
% 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 ExcelDemoclc;close all;clear all;fullFileName = GetXLFileName();if isempty(fullFileName) % User clicked Cancel.
return;endExcel = 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;endif ~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;
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