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Dear mikrom, many thanks for your reply. it is solved by your help.

Thank you so much for your reply. I knew that "a" is an array, but I don't know how to use it as an input to a procedure and use its elements in the proc. Would you please write the simple procedure of importing array "a" into a proc named mult? or just provide a simple script or example of it...

I want to input a vector "a" (or matrix) to a procedure and do some algebraic operations with its elements: set a(1) 2; set a(2) 3; proc mult {a} { global b set b [expr $a(1)*$a(2)] } mult $a puts "$b" when I run this script it says: can't read "a": variable is array can anyone help me...