Export data to specified excel rows using writematrix

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Cassandra Martin
Cassandra Martin 2022 年 2 月 13 日
回答済み: Jeremy Hughes 2022 年 2 月 14 日
Hi,
I am trying to export data to some rows in excel. Here is an example:
writematrix(subjects,'Matlab to Excel Subject Data.xlsx','Sheet',2,'Range','B3:I3')
I have tried using 'WriteMode' and 'append' however, this overrides my headings and titles in the excel file. I would like to fill B3:I3 and continute to B40:I40. I have tried using a for loop which will increase the row by 1.
Here is what I tried:
for i = 3:40
writematrix(subjects,'Matlab to Excel Subject Data.xlsx','Sheet',2,'Range','B',(i+1),':I'(i+1))
end
Unforetunely this does not work. Is there a solution to this?
  10 件のコメント
Cassandra Martin
Cassandra Martin 2022 年 2 月 14 日
Thank you for all of your help. I've decided it will be best to create one giant matrix and then export it to excel using this method: 'Range','B3:I40'

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Jeremy Hughes
Jeremy Hughes 2022 年 2 月 14 日
I believe it should be possible to do this using (almost) the syntax you tried, and there are some suggestions in the comments, but I wanted to share the "WriteMode" parameter as that should do exactly what you're looking for.
for i = 1:5
writematrix(randn(1,3),'test.xlsx','WriteMode','append');
end
A = readmatrix('test.xlsx')
A = 5×3
0.1677 1.1237 1.0494 -1.1193 -0.3099 -0.5449 -1.1076 1.6841 -0.0993 -2.1830 -0.7395 0.7467 -1.0709 0.0737 0.2002
That said, it's going to be a lot slower writing single rows at a time, since writematrix has to open, write, and close the file each time. It's not meant for incremental writing. So the solution to build up the matrix first makes the most sense to me.
The append appoach could be useful if you have very large arrays, but I suspect that the XLSX format will limit you before the array size will.

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