R: Mathematical functions

Math {spam} | R Documentation

## Mathematical functions

### Description

Applies the `Math` group functions to `spam` objects

### Usage

    # ceiling(x)
    # floor(x)
    # exp(x, base = exp(1))
    # log(x, base = exp(1))
    # sqrt(x)

    # abs(x)
    # cumprod(x)
    # cumsum(x)

    # cos(x)
    # sin(x)
    # tan(x)

    # acosh(x)
    ...

### Arguments

`x` | spam object.
`base` | positive number. The base with respect to which logarithms are computed. Defaults to `e=exp(1)`.

### Details

It is important to note that the zero entries do not enter the evaluation when `structurebased=FALSE`. The operations are performed on the stored non-zero elements. This may lead to differences if compared with the same operation on a full matrix.

### Value

If the option `spam.structurebased=TRUE`, all functions operate on the vector `x@entries` and return the result thereof.
Conversely, if `structurebased=FALSE`, the result is identical to one with `as.matrix(x)` input and an `as.spam` purger.

### Author(s)

Reinhard Furrer

### See Also

`Summary.spam`, `Ops.spam` and `Math2.spam`

### Examples

    getGroupMembers("Math")

    mat <- matrix(c( 1,2,0,3,0,0,0,4,5),3)
    smat <- as.spam( mat)
    cos( mat)
    cos( smat)

    options(spam.structurebased=FALSE)
    cos( smat)

    sqrt( smat)

[Package spam version 2.1-1 Index]