| getDependsThread {CodeDepends} | R Documentation |
Compute which code blocks in a script are inputs to define a variable
Description
This function is used to determine which code blocks in an R "script" that are needed to define a particular variable. This finds the smallest complete set of expressions or code blocks that must be evaluated in order to define the specified variable(s). It omits expressions that do not provide outputs that are not used as inputs to (indirectly) define the speciied variable.
Usage
getDependsThread(var, info, reverse = TRUE)
Arguments
var |
the name of a variable in the script |
info |
a list of the meta-information for each of the code elements in the script. |
reverse |
a logical value that determines whether we reverse the indices of the expressions or leave them as end-to-first. |
Value
An integer vector giving the indices of the
script code blocks which are required to define
var.
Author(s)
Duncan Temple Lang
See Also
getExpressionThread
readScript
getVariables
Examples
sc = readScript(system.file("samples", "dual.R", package =
"CodeDepends"))
sci = getInputs(sc, formulaInputs = TRUE) ## script has formula with no data.frame
idx = getDependsThread("fit", sci)