CODEWITHSUNDEEP
rmatrixrbindcbind
JKJ
JKJ

Reputation: 212

Creating empty rows on matrix of various size

I am trying to generate a matrix with the following data, Is there any way to create empty rows to make matrix the same size? 

#Generating original data
n <- c(12,24)
mu <- c(6.573,6.5)
sigma <- sqrt(0.25)
Diseased.Data <- round(rnorm(n[1],mu[1],sigma),4)
Healthy.Data <- round(rnorm(n[2],mu[2],sigma),4)
g <- c(2,3,4)

cstar.pool <- (mu[1]+mu[2])/2
#generating pooled data
for(i in 1:3){
  assign(paste("pool.dis.data",i,sep = ""),replicate(n[1]/g[i],mean(sample(Diseased.Data,g[i]))))
  assign(paste("pool.hel.data",i,sep = ""),replicate(n[2]/g[i],mean(sample(Healthy.Data,g[i]))))
}

#generating the pooled diseased data matrix
dis.mat1<- matrix(data = pool.dis.data1,length(pool.dis.data1),1)
dis.mat2 <- matrix(data = pool.dis.data2,length(pool.dis.data2),1)
dis.mat3 <- matrix(data = pool.dis.data3,length(pool.dis.data3),1)
dis.mat2 <- rbind(dis.mat2,NA)
dis.mat2 <- rbind(dis.mat2,NA)
dis.mat3 <- rbind(dis.mat3,NA)
dis.mat3 <- rbind(dis.mat3,NA)
dis.mat3 <- rbind(dis.mat3,NA)
dis.matrix <- matrix(NA, max(length(pool.dis.data1),length(pool.dis.data2),length(pool.dis.data3)),3)
dis.matrix[,1] <- cbind(dis.mat1)
dis.matrix[,2] <- cbind(dis.mat2)
dis.matrix[,3] <- cbind(dis.mat3)

Upvotes: 0

Views: 367

Answers (1)

rosscova
rosscova

Reputation: 5590

I'd say your best bet is to start out with an empty matrix of the size you need. You can tell matrix to specify the dimensions on creation like so:

new <- matrix( data = NA, nrow = 10, ncol = 20 )

So you just need to create a value for each dimension, based on your input data:

num.rows <- max( length(n), length(mu), ... )
num.columns <- [ I'd just enter a numeric value here ]
new <- matrix( data = NA, nrow = num.rows, ncol = num.columns )

Then you can fill the columns as needed, making sure to leave any excess empty. For example:

new[(1:length(n)),3] <- n

The "1:length(n)" part there will tell R to stop filling the column once the values you've given it have been entered. Otherwise R will continue filling, and you'll get repeated values, which I'm guessing you don't want.

Upvotes: 1

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