# TCL_ExistVar

Return %T if a tcl variable exists

## Calling Sequence

    OK=TCL_ExistVar(varname [,interp])

## Arguments

varname

  character string. Contains the name of the tcl/tk variable.

interp

  optional character string parameter. Name of the slave tcl interpreter in which the operation has to be performed. If not provided, it defaults to the main tcl interpreter created by Scilab.

ok

  boolean. %T if varname exists.

## Description

This routine allows to test if a tcl variable exists.

More information about Tcl/Tk: http://www.tcl.tk/doc/

## Examples

    TCL_SetVar("Scilab","OK")
    TCL_GetVar("Scilab")
    TCL_UnsetVar("Scilab")
    TCL_ExistVar("Scilab")

    TCL_SetVar("aa",1)
    TCL_CreateSlave('SlaveInterp');
    TCL_SetVar("aa",2,'SlaveInterp')
    TCL_ExistVar("aa")
    TCL_GetVar("aa")
    TCL_UnsetVar("aa")
    TCL_GetVar("aa",'SlaveInterp')
    TCL_UnsetVar("aa",'SlaveInterp')
    TCL_ExistVar("aa",'SlaveInterp')
    TCL_DeleteInterp('SlaveInterp')

## See Also

- ScilabEval
- TCL_EvalFile
- TCL_EvalStr
- TCL_GetVar
- TCL_SetVar
- TCL_UnsetVar
- TCL_UpVar
- TCL_CreateSlave