How to get stats by group

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Mekala balaji
Mekala balaji 2020-8-16
回答： Image Analyst 2020-8-16
Hi,
I have cell array as shown below:
data:
Name Age rank
A 20 12
B 20 42
A1 13 2
A2 22 3
B2 20 32
N 22 19
How to get "min, max, mean, std" by group. Now use below code:
unq_age= unique(dsts(2:end,2))
for i =1:numel(unq_age)
tmp =unq_age(i)
idx= cellfun(@(x)isequal(x,tmp),data(:,2));
tmp_data = data(idx,3)
min_x=min(str2double(tmp_data))
max_x=max(str2double(tmp_data))
mean_x=mean(str2double(tmp_data))
std_x=std(str2double(tmp_data))
but is there any function to get group stats? in one line

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回答（2 个）

Mohammad Sami
Mohammad Sami 2020-8-16
You can use the function group summary. See documentation for more details. https://www.mathworks.com/help/matlab/ref/double.groupsummary.html
Image Analyst
Image Analyst 2020-8-16
If you have the stats toolbox, try grpstats(). Otherwise try splitapply().

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