Control chart function help

Hello guys , I'm trying to create a controlchart using this command controlchart(X,5) , I get this error 'Error using controlchart (line 188)

G must have one group value for each row of X' > Any one please help

Answer 1

[Adam Danz]

The second input to controlchart(x,group) is a grouping variable that defines which group each element of x belongs to. It must be the same length as x.