Creates a classification of expressions. The bin width is determined by the number set as interval. The result is shown as a<=x<b, where a and b are the upper and lower limits of the bin. The x can be replaced by an arbitrary string stated in label. 0 is normally the default starting point of the classification. This can be changed by adding an offset.
Examples:
class( var,10 ) with var = 23 returns '20<=x<30'
class( var,5,'value' ) with var = 23 returns '20<= value <25'
class( var,10,'x',5 ) with var = 23 returns '15<=x<25'
If any issues understanding from here, please let know.
Most of the confusion could probably be around offset,it is nothing but the number the interval starts from. Hence, taking it from there, in 'class(8,3,'y',2)' interval starts from 2; interval 3 will generate the intervals like: 2+3=5, 5+3=8, 8+3=11, ...
Now the number 8 belongs to 8-11. 'y' is just a label.
