Dear R-users,
I am having trouble constructing nxn matrices involving calculations&
conditions based on other tables.
Below I describe a simple example of what I am trying to do:
Given the Table A (n x m):
Species1
Species2
X
A1,1
A1,2
Y
A2,1
A2,2
Z
A3,1
A3,2
I want to create a matrix M (n xn)
X
Y
Z
X
-
M1,2
M1,3
Y
M2,1
-
M2,3
Z
M3,1
M3,2
-
Where M1,2 is equal to the number of common species between X & Y
So if:
A1,1 = 5; A1,2 =0
A2, 1 = 1; A2,2 =3
Then M1,2 = 1
And also a matrix N (nxn)
A
B
C
A
-
N1,2
N1,3
B
N2,1
-
N2,3
C
N3,1
N3,2
-
Where N1,2 is Sum A1,i Sum A2,i
Any help or guidance on where I should look for information on these type of
calculations will be very appreciated!
Many thanks,
Luisa
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