Tclspice opens its doors to TCL and BLT with a single specific command spicetoblt.

TCLspice gets its identity in the command spice::vectoblt . This command copies data computed by the simulation engine into a tcl variable. vectoblt is composed of three words: vec, to and blt. Vec means SPICE vector data. To is the English preposition, and blt is a useful tcl package providing a vector data structure. Example:

blt::vector create Iex
spice::vectoblt Vex#branch Iex

Here an empty blt vector is created. It is then filled with the vector representation of the current flowing out of source Vex. Vex#branch is native SPICE syntax. Iex is the name of the BLT vector.

The reverse operation is handled by native SPICE commands, such as alter, let and set.