| #### 7.10.6.4 ncratDefine Procedure from library `ncrat.lib` (see ncrat_lib). Usage: ncrat f = ncratDefine(s, l); string s contains kind, list l contains expressions Return: ncrat with kind s and expressions l Note: assignment operator '=' for ncrat is overloaded with this procedure, hence ncrat f = s, l; yields the same result as ncrat f = ncratDefine(s, l); Example:
    LIB "ncrat.lib";
    ncInit(list("x", "y", "z"));
    number n = 5;
    ncrat f = ncratDefine("Const", list(n));
    typeof(f);
    ==> ncrat
    f.kind;
    ==> Const
    f.expr;
    ==> [1]:
    ==> 5
    f;
    ==> 5
    ==>
    ncrat g = "Const", list(n);
    g;
    ==> 5
    ==>

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