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Specific Row/Column addition and subtraction in a N by M matrix

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WARRIOR24
WARRIOR24 on 21 Apr 2021
Answered: David Hill on 21 Apr 2021
I am trying to add and subtract specfic rows and colums, the sum function is not working working for me; it is either suming up all of the values or adding all columns only.
1.1125 2.0641 2.3183 1.8751 1.2631 0.6625
3.4084 5.1874 5.2771 3.6026 2.1510 1.0079 1.) I am trying to sum up all the outside elements starting from
10.000 10.000 10.000 5.1074 2.7302 1.2181 3.4084 and ending at 2.8216
5.3388 6.2794 6.0136 4.0968 2.4445 1.1343 2.) As well as the inner elements starting from
2.9655 3.7652 3.6784 2.8216 1.8166 0.8745 10.000 to 10.000 (sideways) and from 10.000 to 3.6784
1.6518 2.1375 2.1130 1.6946 1.1259 0.5472 (downwards). This should be 3 elements in both directions
0.8781 1.0199 0.9417 0.7178 0.4451 0.1884 3.) then subtract the outter from inner with the abs function
0.4931 0.6300 0.6188 0.5039 0.3377 0.1618
0.2869 0.3881 0.3997 0.3411 0.2401 0.1213
0.1692 0.2358 0.2506 0.2208 0.1603 0.0832
0.0971 0.1354 0.1462 0.1313 0.0971 0.0511
0.0472 0.0625 0.0674 0.0611 0.0456 0.0242

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