caret (version 7.0-1)

as.matrix.confusionMatrix: Confusion matrix as a table

Description

Conversion functions for class confusionMatrix

Usage

# S3 method for confusionMatrix
as.matrix(x, what = "xtabs", ...)

Value

A matrix or table

Arguments

x

an object of class confusionMatrix

what

data to convert to matrix. Either "xtabs", "overall" or "classes"

...

not currently used

Author

Max Kuhn

Details

For as.table, the cross-tabulations are saved. For as.matrix, the three object types are saved in matrix format.

Examples

###################
## 2 class example

lvs <- c("normal", "abnormal")
truth <- factor(rep(lvs, times = c(86, 258)),
                levels = rev(lvs))
pred <- factor(
               c(
                 rep(lvs, times = c(54, 32)),
                 rep(lvs, times = c(27, 231))),
               levels = rev(lvs))

xtab <- table(pred, truth)

results <- confusionMatrix(xtab)
as.table(results)
as.matrix(results)
as.matrix(results, what = "overall")
as.matrix(results, what = "classes")

###################
## 3 class example

xtab <- confusionMatrix(iris$Species, sample(iris$Species))
as.matrix(xtab)