In[]:=
Ksys={{0,1,2,3,4},{5,6,7,8,9}}
Out[]=
{{0,1,2,3,4},{5,6,7,8,9}}
In[]:=
K1={{10,11,12,13,14},{15,16,17,18,19}}
Out[]=
{{10,11,12,13,14},{15,16,17,18,19}}
In[]:=
Ksys[[1,3]]
Out[]=
2
In[]:=
Ksys[[1,3]]+K1//MatrixForm
Out[]//MatrixForm=
12 | 13 | 14 | 15 | 16 |
17 | 18 | 19 | 20 | 21 |