 Dear R project group

I have the following problem

Let suppose the following data:


b<-c("0","1","1","1","0","1","0","0","1","0","1","1","1","0","1","1","0","1","1","0")
bm<-matrix(b,ncol=4)
colnames(bm)<-c("F1", "F2", "F3", "F4")
d<-c("F1","F4")

For the matrix bm i need to create a fifth column. 1This column should
contain the sums  of values where the columname is equal to the vector d.
2. I need to get the maximum and minimum value of this last column
The matrix result should be like this

     *F1*  F2  F3  *F4 Res*
[1,] *"0"* "1" "1" "*1" "1"
*[2,] "1" "0" "1" "0"  *"1"*
[3,] "1" "0" "1" "1"  *"2"*
[4,] "1" "1" "0" "1"  *"2"*
[5,] "0" "0" "1" "0"  *"0"*

Thxs again for your help


-- 
Alberto Lora Michiels
Rue du Progrès,  6B
7860 Lessines
GSM 32(0)496659457

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