MATLAB Programming Fundamentals - MathWorks

The findgroups function returns G, a vector of group numbers created from Smoker.

The splitapply function uses G to split Weight into two groups. splitapply applies

the mean function to each group and concatenates the mean weights into a vector.

findgroups returns a vector of group identifiers as the second output argument. The

group identifiers are logical values because Smoker contains logical values. The patients

in the first group are nonsmokers, and the patients in the second group are smokers.

smoker

smoker = 2x1 logical array

0

1

Split the patient weights by both gender and status as a smoker and calculate the mean

weights.

G = findgroups(Gender,Smoker);

meanWeight = splitapply(@mean,Weight,G)

meanWeight = 4×1

130.3250

130.9231

180.0385

181.1429

The unique combinations across Gender and Smoker identify four groups of patients:

female nonsmokers, female smokers, male nonsmokers, and male smokers. Summarize

the four groups and their mean weights in a table.

[G,gender,smoker] = findgroups(Gender,Smoker);

T = table(gender,smoker,meanWeight)

T=4×3 table

gender smoker meanWeight

______ ______ __________

Female false 130.32

Female true 130.92

Male false 180.04

9 Tables