i have this problem with matrices i want to check between two matrices if they
are isomorphic i will give an example for what excactly i want
1 -1 1 -1 1 1
-1 1 -1 1 -1 -1
1 1 -1 1 1 -1
this two matrices are isomorphic beacause if i change the first 2 columns the
matrices are identical
1 -1 1 -1 1 -1
-1 1 -1 1 -1 1
1 1 -1 1 -1 1
this two matrices are isomorphic because if i change the first 2 rows the
matrices are identical
1 -1 1 1 -1 1
-1 1 -1 -1 1 -1
1 1 -1 -1 -1 1
this two matrices are isomorphic because in the third line if i change the
signs the two matrices are identical
1 -1 1 1 1 1
-1 1 -1 -1 -1 -1
1 1 -1 1 -1 -1
this two matrices are isomorphic because in the second column if i change the
signs the two matrices are identical
and all the above together
rA <- apply(BB2[,,1,(j-1)],1,paste,collapse=" ")
rB <- apply(BB2[,,i,(j-1)],1,paste,collapse=" ")
cA <- apply(BB2[,,1,(j-1)],2,paste,collapse=" ")
cB <- apply(BB2[,,i,(j-1)],2,paste,collapse=" ")
iso <- all(sort(rA) == sort(rB)) | all(sort(cA) == sort(cB))
this is only for the change or rows and columns but i want to change the signs
too.
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