as.matrix.confusionMatrix: Confusion matrix as a table

In caret: Classification and Regression Training

Confusion matrix as a table

Description

Conversion functions for class confusionMatrix

Usage

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

Arguments

x	an object of class confusionMatrix
what	data to convert to matrix. Either "xtabs", "overall" or "classes"
...	not currently used

Details

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

Value

A matrix or table

Author(s)

Max Kuhn

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)

caret documentation built on March 31, 2023, 9:49 p.m.