Matlab怎样按索引给矩阵某些位置赋不同的相应值,不用for循环?举例: A = [ 1,4, 6, 9 ,2,8,5,7 ] indx = A>5 想把大于5的按indx全改为5,怎么不用循环实现?indx = A>5 想把大于5的按indx全改为原值加一,怎么不用循环实现?