Multiple function handle in varfun

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Zeynab Mousavikhamene
评论： Walter Roberson 2020-9-17
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.

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回答（1 个）

Walter Roberson
Walter Roberson 2019-12-7
You can use @(v) [mean(v), std(v)] as the function, and splitvars() afterwards.
  2 个评论
Yosef Farzi
Yosef Farzi 2020-9-17
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 2020-9-17
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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