功能:块区域替换

格式:
ReplaceRect(a, b, rect, pos)
ReplaceRect(a, b, rect)
ReplaceRect(a, b)
a : 原始矩阵变量
b : 替换为的矩阵变量
rect:一个1*4的矩阵变量，存储b矩阵需要替换的x,y起始坐标，以及替换大小，格式为[x,y,w,h]；或者为一个1*2矩阵变量存储[w,h],默认x=1，y=1
pos :一个1*2的矩阵变量，存储需要替换a矩阵左上角的起始坐标,此值默认为[1,1]

例子:
a =
[ 6.04202265666892    4.17257262588133    7.00387053052144    6.71972838543343    2.45008515773811    4.32186355084268
  8.85747075493330    6.71877122797015    6.61149735870375    7.66922413262968    3.79445457076396    9.41148507847054
  7.58923362828290    3.21523171999270    8.36044035309946    2.98108426992832    2.28943558982082    5.01570809866102
  8.13861981878924    2.35191417967524    8.69913974250627    5.48136227088112    7.45016278114643    6.78133830278243 ]

b =
[ 8.00000000000000    23.0000000000000    15.0000000000000    18.0000000000000
  5.00000000000000    28.0000000000000    13.0000000000000    30.0000000000000
  20.0000000000000    5.00000000000000    19.0000000000000    24.0000000000000 ]
r = [2,2,2,3];
x = [2,2];

c =ReplaceRect(a,b,r,x)//回车得到如下结果
c =
[ 6.04202265666892    4.17257262588133    7.00387053052144    6.71972838543343    2.45008515773811    4.32186355084268
  8.85747075493330    28.0000000000000    13.0000000000000    30.0000000000000    3.79445457076396    9.41148507847054
  7.58923362828290    5.00000000000000    19.0000000000000    24.0000000000000    2.28943558982082    5.01570809866102
  8.13861981878924    2.35191417967524    8.69913974250627    5.48136227088112    7.45016278114643    6.78133830278243 ]