Tcl and OTcl Tutorial For NS2 Loops and Conditional Statements For loops For loops are very useful in ns and can be used in conjunction with arrays to easily create larger network topologies. To generate 100 nodes, the following code can be used: for {set i 0}{$i < 100}{incr i} { set n($i) [$ns node] } While loops These are very similar to for loops. The syntax is set i 0 while {$i < 10} { set n($i) [new Node] incr i } If statements If statements are very simple if {$i < 10} { puts "i is less than 10" } if {$var2 == "Tcl Variable 2"} { puts "var2 = Tcl Variable 2" } download file now