//
//scat plot command
//
//this plot command draws various graph according to number of variables.
//According to number of variables,graph type is bellow 
//1   ->    histgram
//2   ->    2 dimension scat plot
//3   ->    3 dimension scat plot
//over 4 -> matrix of scat plot

//Syntax without category variable.
plot scat [variables];

//syntax with category variable. 
plot scat [variables] by [category variable];

//Caution
//In this plot command,number of variable is less then 7.
//When draws matrix of scat plot,ignore category variable.

//Example 
get iris@;

//Because of 1 variable,draw histgram.
plot scat SepalW by Species;

//Because of 2 variables,draw scat plot in 2 dimension.
plot scat SepalW SepalL by Species;

//Because of 3 variables,draw scat plot in 3 dimension.
plot scat SepalW SepalL PetalW by Species;

//Because of 4 variables,draw matrix of scat plot.
plot scat SepalW SepalL PetalW PetalL;