Brain Imaging & Analysis Center

fScan supports several different types of internal variables. Values of some variables are global – they do not change when you move from one active window to another. Other variables are workspace or data set specific – their values will change depending on which window is currently active.

• Global string variables
• Global control variables
• User-defined variables
• Data-set number variables
• Data-set string variables
• Data-set array variables

In general, data variable values can be accessed by specifying the name of the variable, preceded by the '$' character. To get the status of a variable, substitute '?' for '$'; the status is -1 if the named variable is not defined, it is 0 if it is defined but empty, and it is a positive value (the size of the variable) if it is defined and not empty.

For example:

• -echo Window: $thiswin WorkSpace $wsnum ; display name and workspace of current active window
• -echo Varb: ?curdir ?thiswin ?myvarb ; test whether these variables are defined

Variable operators:

• $
• ?
• exists
• filepath
• relpath
• tables
• listitem
• listflag

See Also:
Set, If, and Echo commands.
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