unpublished TCL functions documentation

Dear All,

I'm for the first time using the script parser in order to update the TCL scripts used by my company.

Let me precise that the scripts were not created by myself but by a colleague which left the company few month ago.

The script parser is really a good tool but I cannot find documentation for some functions, like this one :

*collectorcreate loadcols "$load_case($i,0)\_$load_case(0,$j)" "" [expr (3*$i)+$j]

It is complicated to understand all the parameters used. In fact I dont understand what the parameter is used for : [expr (3*$i)+$j]

Is there some documentation (maybe offline one, such as pdf ?) to help me upgrading these scripts ?

Thanks in advance for your help.

BR,

Antoine