Using variable in array of Tcl

Question

I create a variable called delay

set delay [expr ($max-$min)];

I want to use it in a array like:

set_value/$env(sim_name)/taps  {{0,0,$delay,0,0}}; #double[5]

But brace will stop to substitution the value of delay, right？

The fault said is invalid_float or zero element array.

what could I do?

You're trying to pass more than 2 arguments to a set command? — Jerry
– Jerry, Commented Aug 5, 2013 at 9:12
I edited it from “set value” to “set_value”. It is just one argument. — cheesewendy
– cheesewendy, Commented Aug 5, 2013 at 10:00
Well, now there's no command like that built in Tcl... Could you elaborate on what you're trying to do exactly? — Jerry
– Jerry, Commented Aug 5, 2013 at 10:21
With the third version of your question, did you intend to have a space after set_value, or is the command really that whole word set_value/$env(sim_name)/taps? — Bryan Oakley
– Bryan Oakley, Commented Aug 5, 2013 at 10:53
Ask your other questions as new questions. That's how Stack Overflow works. — Donal Fellows
– Donal Fellows, Commented Aug 6, 2013 at 8:42

Bryan Oakley · Accepted Answer · 2013-08-05 10:51:19Z

1

The outermost braces are for quoting. A good rule for quoting is to use what works. In other words, don't use curly braces if you don't want the behavior of curly braces. If you need to have variables expanded, use double quotes:

set_value/$env(sim_name)/taps "{0,0,$delay,0,0}"

There's likely another thing wrong with your example. You're calling a command named "set_value/$env(sim_name)/taps", which is a rather unusual looking command name. Are you certain that's what you want to do?

answered Aug 5, 2013 at 10:51

Bryan Oakley

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3 Comments

Donal Fellows Over a year ago

I'm guessing that it is what he wants; I've seen stuff like that in questions before. (I'm not quite sure which tool they're using, but it seems to exist.)

cheesewendy Over a year ago

It is .scf file, use to setup configures of simulation.

cheesewendy Over a year ago

Thank you, it solves my problem. Another thing, if I want to run iterations, using for and incr seems does not work...

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