MATLAB Answers


Use Splitapply to write multiple files

Asked by Sanjay
on 19 Nov 2019 at 18:38
Latest activity Commented on by Sanjay
on 19 Nov 2019 at 20:46
I have grouped tables by a variable and I am trying to write multiple files based on the grouping variable. But it does not work.
I used findgroups and splitapply. But the splitapply is where I am having problems.
Here is one version of the commands I am using
load patients;
func=@(x,y) csvwrite(x,y)
When I figure out how to use this, I will be using it on large datastore tall arrays. Please help !


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1 Answer

Answer by Stephan
on 19 Nov 2019 at 20:32
Edited by Stephan
on 19 Nov 2019 at 20:33
 Accepted Answer

Here is a small example of how it could work:
% some data to play with
Gender = ['m' 'm' 'w' 'w' 'm' 'w']';
Age = randi(60,6,1) + 15;
Weight = randi(100,6,1) + 20;
Height = randi(round(80/25.4),6,1) + round(110/25.4,1);
% create a table of the data
T = table(Gender,Age,Weight,Height)
% find groups depending on the gender
T.groups = findgroups(T.Gender);
% Write the 2 groups in 2 excel files depending on the gender group
% The file names here are "Table_1.xls" and "Table_2.xls" and both are
% stored in the current working folder
for k = 1:max(T.groups)
writetable(T(T.groups==k,1:end-1),['Table_' num2str(k)],'FileType','spreadsheet')

  1 Comment

on 19 Nov 2019 at 20:46
Hello Stephan, thank you for taking the time! Your code will work for me.
My hope still is that I could write the files without using a loop with splitapply..

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