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library(iterators)
test00 <- function() {}
# test vector iterator creation
test01 <- function() {
x <- iter(1:10)
}
# test hasNext, nextElem
test02 <- function() {
x <- iter(1:10)
checkEquals(nextElem(x), 1)
for(i in 1:9) nextElem(x)
checkException(nextElem(x))
}
# check checkFunc
test03 <- function() {
x <- iter(1:100, checkFunc=function(i) i%%10==0)
checkEquals(nextElem(x), 10)
for(i in 1:9) nextElem(x)
checkException(nextElem(x))
}
# test matrix iterator creation
test04 <- function() {
x <- matrix(1:10,ncol=2)
}
# test hasNext, nextElem
test05 <- function() {
x <- matrix(1:10,ncol=2)
# by cell
y <- iter(x,by='cell')
checkEquals(nextElem(y), 1)
for(i in 1:9) nextElem(y)
checkException(nextElem(y))
# by col
y <- iter(x,by='column')
checkEquals(nextElem(y), matrix(1:5, ncol=1))
nextElem(y)
checkException(nextElem(y))
# by row
y <- iter(x,by='row')
checkEquals(nextElem(y), matrix(c(1,6),nrow=1))
for(i in 1:4) nextElem(y)
checkException(nextElem(y))
}
# test checkFunc
test06 <- function() {
# create a larger matrix
x <- matrix(1:100, ncol=20)
# by cell
y <- iter(x, by='cell', checkFunc=function(i) i%%10==0)
checkEquals(nextElem(y), 10)
for(i in 1:9) nextElem(y)
checkException(nextElem(y))
# by col
y <- iter(x, by='column', checkFunc=function(i) i[5]%%10==0)
checkEquals(nextElem(y), as.matrix(x[,2]))
for(i in 1:9) nextElem(y)
checkException(nextElem(y))
# by row
# create an easier matrix to deal with
x <- matrix(1:100, nrow=20, byrow=TRUE)
y <- iter(x, by='row', checkFunc=function(i) i[5]%%10==0)
checkEquals(as.vector(nextElem(y)), x[2,])
for(i in 1:9) nextElem(y)
checkException(nextElem(y))
}
# test data frame iterator creation
test07 <- function() {
x <- data.frame(1:10, 11:20)
y <- iter(x)
}
# test hasNext, nextElem
test08 <- function() {
x <- data.frame(1:10, 11:20)
# by row
y <- iter(x, by='row')
checkEquals(nextElem(y), x[1,])
for(i in 1:9) nextElem(y)
checkException(nextElem(y))
# by col
y <- iter(x, by='column')
checkEquals(nextElem(y), x[,1])
nextElem(y)
checkException(nextElem(y))
}
# test checkFunc
test09 <- function() {
x <- data.frame(1:10, 11:20)
# by row
y <- iter(x, by='row', checkFunc=function(i) i[[1]][1]%%2==0)
checkEquals(nextElem(y),x[2,])
for(i in 1:4) nextElem(y)
checkException(nextElem(y))
# by col
y <- iter(x, by='column', checkFunc=function(i) i[[1]][1]%%11==0)
checkEquals(nextElem(y), x[,2])
checkException(nextElem(y))
}
# test function iterator creation
# we need to test a function that takes no arguement as
# well as one that takes the index
test10 <- function() {
noArgFunc <- function() 1
needArgFunc <- function(i)
if(i>100)
stop('too high')
else
i
}
# test hasNext, nextElem
test11 <- function() {
noArgFunc <- function() 1
needArgFunc <- function(i) if(i>100) stop('too high') else i
y <- iter(noArgFunc)
checkEquals(nextElem(y), 1)
nextElem(y)
y <- iter(needArgFunc)
checkEquals(nextElem(y), 1)
for (i in 1:99) nextElem(y)
checkException(nextElem(y))
}
# test checkFunc
test12 <- function() {
noArgFunc <- function() 1
needArgFunc <- function(i)
if(i>100)
stop('too high')
else
i
y <- iter(noArgFunc, checkFunc=function(i) i==1)
checkEquals(nextElem(y), 1)
nextElem(y)
y <- iter(needArgFunc, checkFunc=function(i) i%%10==0)
checkEquals(nextElem(y), 10)
for(i in 1:9) nextElem(y)
checkException(nextElem(y))
}
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