Hello,

I'm having trouble performing a certain function within R and I was hoping
someone might be able to help.  I have a matrix (1000x21) that contains
whole-number values ranging from 1-7 and I want to replace all entries
within this matrix that have a value of 1 with a random number contained
within a different dataframe that has 21 rows,1000 columns.  I've tried
using the if/else function, but this always seems to return a list with
strange output.  I've also tried using the "replace" and "apply" functions,
but can't seem to get anything to work. My code is as follows:

#create data frame of 21000 random values

m_good_initial=rnorm(21000,2.79,0.18)
m_good_D1=ifelse(m_good_initial<0,0,m_good_initial)
m_good_D1mat=matrix(m_good_D1,byrow=T,21)
m_good_D1=as.data.frame(m_good_D1mat)

#create matrix of (1000x21) that contains whole-number values ranging from
1-7
#using sample to select values with a respective probability
search_strat_good <-
sample(landscenarios,1000,replace=T,prob=com_avgpgood[1,])
for (i in 2:21) {

        search_strat_good <-
cbind(search_strat_good,sample(landscenarios,1000,replace=T,prob=com_avgpgood[i,]))
}

#replace all search strategies of value "1" within matrix
"search_strat_good"
#with a random value from dataframe "m_good_D1"

bengood1=ifelse(search_strat_good==1,sample(m_good_D1,replace=F),search_strat_good)

Any help would be greatly appreciated.
-- 
Curtis Burkhalter

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