Multiple function handle in varfun

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Zeynab Mousavikhamene
Zeynab Mousavikhamene on 7 Dec 2019
Commented: Walter Roberson on 17 Sep 2020
I need to calculate the mean and STD of elements of table and the resulting table show me the mean and std in two columns next to each other. Here is the code I am using:
Tmean = varfun(@mean,T,'GroupingVariables',...
{'stor','s_method'},'InputVariables',{'ix','atfa','iss','aad'});
How can I add STD to Tmean? I dont want to make separate table for STD.

Answers (1)

Walter Roberson
Walter Roberson on 7 Dec 2019
You can use @(v) [mean(v), std(v)] as the function, and splitvars() afterwards.
  2 Comments
Yosef Farzi
Yosef Farzi on 17 Sep 2020
That was a smart move. i am trying to save 'mean' string in a variable and the use that variable for splitvars(). no luck so far, any suggestions?
a= mean
b=std
@(v) [a(v),b(v)]
splitvars(T,[a,b])
Walter Roberson
Walter Roberson on 17 Sep 2020
fun = @(v) [feval(a,v), feval(b,v)]
Tmean = varfun(fun, T, 'GroupingVariables', ...
{'stor', 's_method'}, 'InputVariables', {'ix','atfa','iss','aad'});
Tout = splitvars(Tmean)
I would not recommend this approach. You would be better using
afun = str2func(a);
bfun = str2func(b);
fun = @(v) afun(v), bfun(v));

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