nuget
applys
01 Syntax
02 Methods
| Name | Overloads | Summary |
|---|---|---|
| apply | 1 | Apply Functions Over Array Margins Returns a vector or array or list of values obtained by applying a function to margins of an array or matrix. |
| parLapply | 1 | Parallel version of lapply. |
| parSapply | 1 | parallel sapply |
| checkInternal | 1 | check for the argument error |
| sapply | 1 | Apply a Function over a List or Vector sapply is a user-friendly version and wrapper of lapply by default returning a vector, matrix or, if simplify = "array", an array if a… |
| lapply | 1 | Apply a Function over a List or Vector lapply returns a list of the same length as X, each element of which is the result of applying FUN to the corresponding element of X. |
03 Members
Apply Functions Over Array Margins
Returns a vector or array or list of values obtained by applying a function to margins of an array or matrix.
If X is not an array but an object of a class with a non-null dim value (such as a data frame), apply attempts to coerce it to an array via as.matrix if it is two-dimensional (e.g., a data frame) or via as.array.
FUN Is found by a call to match.fun And typically Is either a function Or a symbol (e.g., a backquoted name) Or a character string specifying a function to be searched for from the environment of the call to apply.
Arguments in ... cannot have the same name as any of the other arguments, And care may be needed to avoid partial matching to MARGIN Or FUN. In general-purpose code it Is good practice to name the first three arguments if ... Is passed through: this both avoids Partial matching To MARGIN Or FUN And ensures that a sensible Error message Is given If arguments named X, MARGIN Or FUN are passed through ....
| Name | Type | Description |
|---|---|---|
x | Object | an array, including a matrix. |
margin | margins | a vector giving the subscripts which the function will be applied over. E.g., for a matrix 1 indicates rows, 2 indicates columns, c(1, 2) indicates rows and columns. Where X has named dimnames, it can be a character vector selecting dimension names. |
FUN | Object | the function to be applied: see ‘Details’. In the case of functions like +, %*%, etc., the function name must be backquoted or quoted. |
env | Environment | - |
If each call to FUN returns a vector of length n, then apply returns an array of dimension c(n, dim(X)[MARGIN]) if n > 1. If n equals 1, apply returns a vector if MARGIN has length 1 and an array of dimension dim(X)[MARGIN] otherwise. If n is 0, the result has length 0 but not necessarily the ‘correct’ dimension.
If the calls To FUN Return vectors Of different lengths, apply returns a list Of length prod(Dim(X)[MARGIN]) With Dim Set To MARGIN If this has length greater than one.
In all cases the result Is coerced by as.vector to one of the basic vector types before the dimensions are set, so that (for example) factor results will be coerced to a character array.
Parallel version of lapply.
| Name | Type | Description |
|---|---|---|
x | list | - |
FUN | Object | - |
group | Int32 | - |
n_threads | Int32 | - |
verbose | Nullable(Of Boolean) | - |
names | String() | Set new names to the result list, the size of this parameter should be equals to the size of the original input sequence size. |
env | Environment | - |
parallel sapply
check for the argument error
this function will convert the FUN from a clr MethodInfo pointer to RMethodInfo automatically.
| Name | Type | Description |
|---|---|---|
X | Object | check for the input argument, should be nothing if no needed |
FUN | Object | should be implements a R# function interface. |
env | Environment | - |
this function returns nothing if no errors, otherwise a error message will be generated if:
- the input X may be a error message, or
- the given FUN is not implements the RFunction interface.
Apply a Function over a List or Vector
sapply is a user-friendly version and wrapper of lapply by default returning a vector, matrix or, if simplify = "array", an array if appropriate, by applying simplify2array(). sapply(x, f, simplify = FALSE, USE.NAMES = FALSE) is the same as lapply(x, f).
| Name | Type | Description |
|---|---|---|
X | Object | a vector (atomic or list) or an expression object. Other objects (including classed objects) will be coerced by |
FUN | Object | the Function to be applied To Each element Of X: see 'Details’. In the case of functions like +, %*%, the function name must be backquoted or quoted. |
stream | Boolean | run in lazy stream mode? default is not. |
envir | Environment | - |
Apply a Function over a List or Vector
lapply returns a list of the same length as X, each element of which is the result of applying FUN to the corresponding element of X.
| Name | Type | Description |
|---|---|---|
X | Object | a vector (atomic or list) or an expression object. Other objects (including classed objects) will be coerced by |
FUN | Object | the Function to be applied To Each element Of X: see 'Details’. In the case of functions like +, %*%, the function name must be backquoted or quoted. and optional index of function secondary parameter, start from base 1. |
envir | Object | - |