SETPROP Set property values in the label list

    LAB=SETPROP(LAB,PROP,ALLVAL)
    LAB=SETPROP(LAB,PROP,CATEGORY,VALUE)

    LAB=SETPROP(LAB,PROP) % make property content empty

 INPUT
    LAB      label object whose list is used
    PROP     property name
    ALLVAL   cell array with values for all categories
    CATEGORY category specification (name, index or reg.exp)
    VAL      single value (any type)

 OUTPUT
    LAB      SDLAB object with updated list

 DESCRIPTION
 SETPROP sets the property PROP in the LAB.list. Two ways are possible:
 1. Set values of all categories at once by providing cell array ALLVAL
    with one entry per category. If ALLVAL is not given, property is created
    and set to empty.
 2. Set VALUE for a specific CATEGORY defined by index, name or regular
    expression. Multiple categories can be set with one command to the same
    VALUE.

 EXAMPLES:
 lab=SETPROP(lab,'marker',{'bx' 'r*' 'gs'})  % set all markers in the list lab
 lab=SETPROP(lab,'marker','banana','r*')     % set marker for 'banana'
 lab=SETPROP(lab,'marker',2,'r*')            % set marker for 2nd class
 lab=SETPROP(lab,'marker','/apple|banana','*') % set marker for 'apple' and 'banana'
 lab=SETPROP(lab,'size')                     % set size property to empty (create if needed)

 SEE ALSO
 GETPROP, GETPROPLIST, ISPROP, RMPROP