Tcl

Tcl Variables
Tcl variables are always strings even when they contain numeric values. For most applications, using strings has no effect, but occasionally a HyperWorks application will expect a real number and passing a string will cause an error.
Tcl Lists
All variables in Tcl are lists. Lists can contain integers (such as list of node IDs), real numbers (such as coordinates of a node), strings, lists of other lists, or a combination of all the above. A standard variable in Tcl is a list of length 1.
Tcl Arrays
The array is a frequently occurring variable type in programming languages. In Tcl, arrays complement lists by providing additional capabilities when organizing data. Arrays are Tcl variables that have string-based indices (names). Any string value can be used as an array index.
Tcl Mathematical Expressions
In Tcl, mathematical expressions are evaluated using the expr command. This command works with integers, floating point values and logical (Boolean) values. There are many arithmetic operators and built-in math functions in Tcl.
Tcl Boolean Statements
Boolean statements allow you to incorporate logic statements into your control structures and mathematical expressions for evaluation.
Tcl Braces, Quotes and Brackets
Braces, quotes, and square brackets control when variables and commands are processed. They are also used to group parameters.
Tcl Special Characters
The # character is used to skip lines and insert comments. This can be used both from within tkcon as well as from within a Tcl script.
Tcl Procedures
Procedures organize a repetitive group of commands into a logical block and allow for arguments to be parameterized. They improve performance and memory because a procedure’s commands and variables only exist within the scope of the procedure.
Tcl Namespaces
Namespaces provide a means of organizing procedures and variables in Tcl.
Tcl Files
Since Tcl/Tk scripts run on a variety of platforms, and there are so many use cases for accessing files, Tcl provides many commands for file manipulation.
Tcl Strings
The task of extracting and manipulating information via a scripting language is often described using the term string manipulation. Strings are a set of alphanumeric characters stored and manipulated together. These sets are concatenated, truncated, or partitioned by the script with a specific end in mind.

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