getTaskData: Extract data in task.
trainLearner when you add a learning machine to the package.
(task, = , features, target.extra = ,
recode.target = "no")
Selected cases. Either a logical or an index vector.
By default all observations are used.
Vector of selected inputs. You can either pass a character vector with the
feature names, a vector of indices, or a logical vector.
In case of an index vector each element denotes the position of the feature
name returned by
Note that the target feature is always included in the
resulting task, you should not pass it here.
Default is to use all features.
Should target vector be returned separately?
If not, a single data.frame including the target columns is returned, otherwise a list
with the input data.frame and an extra vector or data.frame for the targets.
Should target classes be recoded? Supported are binary and multilabel classification and survival.
Possible values for binary classification are “01”, “-1+1” and “drop.levels”.
In the two latter cases the target vector is converted into a numeric vector.
The positive class is coded as “+1” and the negative class either as “0” or “-1”.
“drop.levels” will remove empty factor levels in the target column.
In the multilabel case the logical targets can be converted to factors with “multilabel.factor”.
For survival, you may choose to recode the survival times to “left”, “right” or “interval2” censored times
using “lcens”, “rcens” or “icens”, respectively.
Surv for the format specification.
Default for both binary classification and survival is “no” (do nothing).
Either a data.frame or a list with data.frame
data and vector
task = (id = "BreastCancer", = , target = "Class", positive = "malignant")
((task, features = ("Cell.size", "Cell.shape"), recode.target = "-1+1"))
((task, = 1:100, recode.target = "01"))