MATLAB Answers

How to get stats by group

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Mekala balaji
Mekala balaji on 16 Aug 2020
Answered: Image Analyst on 16 Aug 2020
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

Answers (2)

Mohammad Sami
Mohammad Sami on 16 Aug 2020
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 on 16 Aug 2020
If you have the stats toolbox, try grpstats(). Otherwise try splitapply().

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