kindly guide me on how i can delete and replace an element from a matrix t below

for example delete first element in column one and replace it with 50, third 
element in column 2 by 90 and fifth element in column 3 by 100


t1<-c(1,2,3,4,5)
t2<-c(6,7,8,9,10)
t3<-c(11,12,13,14,15)
t<-cbind(t1,t2,t3)


thanks
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