在 Ubuntu 中如何消除这个错误？
set tracefile [open out.tr w]
$ns trace-all $namfile
当我运行上面的 TCL 代码时，它会显示在终端中。我刚开始学习TCL所以不知道该怎么办这个错误。
can't read "namfile": no such variable
while executing
"$ns trace-all $namfile"
set tracefile [open out.tr w]
$ns trace-all $namfile
When I am running the above TCL code this is showing in terminal. I have just started learning TCL so don't know what to do anything this error.
can't read "namfile": no such variable
while executing
"$ns trace-all $namfile"
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错误消息非常清楚：当代码
$ns trace-all $namfile运行时，未设置名为namfile的变量。我无法从您提供的代码片段中看出原因； 也许这是因为您应该使用$tracefile来代替，或者也许您应该将namfile设置为某些内容但没有这样做？或者甚至可能是更复杂的事情。 （我也不知道您是否应该为trace-all方法提供通道或文件名；您应该查找一下。）The error message is pretty clear: the variable called
namfileis not set at the point when the code$ns trace-all $namfileis run. I can't tell why from the snippet you provided; maybe it's because you should have used$tracefileinstead, or maybe you should setnamfileto something and haven't done so? Or even possibly something more complicated. (I also don't know whether you're supposed to give a channel or a filename to thetrace-allmethod; you should look that up.)