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extract a mat which have address in a mat from another mat

Example in matlab: A =

 4     9     8
10     3     7
 5     8     4

b = [2 3; 4 5]

b =

 2     3
 4     5

A(b)

ans =

10     5
 9     3

how to find A(b) in OpenCV???? Thank!!!! [email protected]

extract a mat which have address in a mat from another mat

Example in ~~matlab: A =~~matlab:

A =

     4     9     8
 10     3     7
  5     8     4

>> b = [2 3; 4 5]
b = ~~b = [2 3; 4 5]~~

b =

2 3 4 5
>> A(b)
ans = ~~A(b)~~

ans =

10 5 9 3

how to find A(b) in OpenCV???? ~~Thank!!!! [email protected]~~Thank!!!!