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Sunday, December 16, 2012

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"
}

2 comments:

  1. AnonymousFebruary 7, 2013 at 9:12 AM

    Appreciate this post. Will try it out.
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    ReplyDelete
  2. UnknownMay 22, 2013 at 7:17 AM

    In the first example of the for loop, there needs two be spaces. It doesn't compile as
    for {set i 0}{$i < 100}{incr i} {
    set n($i) [$ns node]
    }

    but it will compile as
    for {set i 0} {$i < 100} {incr i} {
    set n($i) [$ns node]
    }

    this includes the added two spaces on line 1 between the braces of the for conditions

    ReplyDelete