Learning Guide Learning Guide

5.4 Evaluation Rules • 193> z := array( [ [1,2], [3,4] ] );[ ] 1 2z :=3 4Maple substitutes y for x and z for y. Because evaluation of the lastname, z, would produce an array, one of the four special structures, z isunevaluated.> x;zMaple uses last-name evaluation for arrays, tables, matrices, and proceduresto retain compact representations of unassigned table entries (forexample, T[3]) and unevaluated commands (for example, sin(x)). Formore information on last-name evaluation, refer to ?last_name_eval.You can force full evaluation by calling eval explicitly.> eval(x);[ ] 1 23 4> add2 := proc(x,y) x+y; end proc;add2 := proc(x, y) x + y end proc> add2;add2You can easily force full evaluation, using eval or print.> eval(add2);proc(x, y) x + y end procNote that full evaluation of Maple library procedures, by default, suppressesthe code in the procedure. To illustrate this, examine the erficommand