序列的相加和相乘运算 例2.2.3：x1=[0,1,2,3,4,3,2,1,0]n1=-2:6; x2=[2,2,0,0,0,-2,-2];n2=2:8 则 ny=-2:8; y1=[0,1,2,3,4,3,2,1,0,0,0] y2=[0,0,0,0,2,2,0,0,0,-2,-2]; yadd-y1+y2=[0,1,2,3,6,5,2,1,0,-2,-2] ymult=-y1.*y2=[0,0,0,0,6,9,0,0,0,0,0]14 例2.2.3：x1=[0,1,2,3,4,3,2,1,0]; n1=-2:6; x2=[2,2,0,0,0,-2,-2]; n2=2:8 则 ny=-2:8; y1=[0,1,2,3,4,3,2,1,0,0,0]; y2= [0,0,0,0,2,2,0,0,0,-2,-2]; yadd=y1+y2=[0,1,2,3,6,5,2,1,0,-2,-2] ymult=y1.*y2=[0,0,0,0,6,9,0,0,0,0,0] 序列的相加和相乘运算