CODEWITHSUNDEEP
tcl
Matteo
Matteo

Reputation: 3

TCL array substitution

In TCL (running v8.6.6) I want to create an array with a substitution of one or more of the value of the array with the value of another variable.

If we were in C I will write

float a = 10;
float b[4] = {1.0, 2.0, 3.0, 4.0};
b[2]=a;

and if I print on stdout I got 1.0 10.0 3.3 4.0.

In TCL instead I started by a simple exampe. I wrote

set a 10.0
set b $a

puts $b

I got 10.0 as output, but if I want to do the same in a array so I wrote

set a 10.0
set b {1.0 $a 3.0 4.0}

puts $b

and I'm expecting

1.0 10.0 3.0 4.0

but I got

-0.5 $a 0.5 0.79

Any idea?

Thanks a lot

Upvotes: 0

Views: 191

Answers (2)

Donal Fellows
Donal Fellows

Reputation: 137557

Though you've found that creating a list with substitutions is done via the list command, here's how to do the assignment to an element that is equivalent to b[2]=a; from C.

lset b 2 $a

Upvotes: 0

Colin Macleod
Colin Macleod

Reputation: 4372

Curly brackets {} prevent substitution, try:

set b [list 1.0 $a 3.0 4.0]

Upvotes: 2

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