MATLAB: Write string into Excel - arrays

Question

I am trying to write an array of coefficients into an Excel file under 1 column (A1). Here is my snippet:
filename = 'cheby2coefs.xlsx';
for Order = 1:1
fprintf('This is');
disp(Order);
[b,a] = cheby2(Order, 20, 300/500);
disp([b,a]);
%xlswrite(filename,{'Order ',Order},'A1'); %string
xlswrite(filename,'b','A1'); %string
xlswrite(filename,b');
xlswrite(filename,'a'); %string
xlswrite(filename,a');
end
The output that i aim for is something like this:
However, my code just keeps creating other sheets. What is the proper way to implement this?

Answer 1

The problem is in the xlswrite lines:
From xlswrite documentation:
xlswrite(filename,A,sheet) writes to the specified worksheet.
That means you are writing string 'b' to sheet 'A1' with xlswrite(filename,'b','A1');
xlswrite(filename,A) writes array A to the first worksheet in Excel
file, filename, starting at cell A1.
You actually do not need to do anything to start writing at A1. Assuming b is a row vector:
xlswrite(filename,b');
as you have written, should suffice.
If you want to specify sheet and column you can use
xlswrite(filename,A,sheet,xlRange)
Update: I cannot try this right now but I think it should work.
You can calculate a and b for every order and write them to an xls file like this:
r = 1; % row number
str = {'a', 'b'};
order = [1 3 5]; % The orders you want to calculate a and b with
for idx = 1:size(order, 2)
[b,a] = cheby2(order(idx), 20, 300/500); % I do not know about second
% and third parameters, you should
% check them.
vals = [a; b]; % assuming they are row vectors
cellName = strcat('A', r);
orderName = strcat('Order ', order(idx));
xlswrite(filename, orderName, 1, cellName)
r = r + 1;
for jdx=1:2
cellName = strcat('A', r);
xlswrite(filename, str{jdx}, 1, cellName);
r = r + 1;
cellName = strcat('A', r);
xlswrite(filename, vals(jdx, :), 1, cellName);
r = r + size(vals, 2);
end
end

Answer 2

xlswrite keeps creating new sheets with every call because you didn't specify the worksheet number.
Instead, try this:
%// Write b under column A1 in the 1st worksheet
xlswrite(filename, 'b', 1, 'A1')
xlswrite(filename, b(:), 1, 'A2')
It's good practice to make sure that b is written as a column by converting it to a column vector first with the b(:) syntax.
In addition, if you want to write the next set of coefficients under column B1, you can do the following:
%// Write a under column B1 in the 1st worksheet
xlswrite(filename, 'a', 1, 'B1')
xlswrite(filename, a(:), 1, 'B2')
Note that the passed sheet number remains 1.

Answer 3

Have you tried xlswrite1 ? You can download the module from here here
Here is the complete module :
filename = 'cheby2coefs.xlsx';
Excel = actxserver('Excel.Application');
Workbook = invoke(Excel.Workbooks, 'open', filename);
set(Excel,'Visible',1);
temp_text= [{'Text'}];
Location = ['A1:A1'];
sheetname = 'Sheet1';
%%
[status, message] = xlswrite1(ExcelFilename, temp_text, sheetname, Location);
if status == 0,
errordlg(message.message);
end
invoke(Workbook,'Save');
invoke(Excel,'Quit');
delete(Excel);
Hope it helps.