is.allzero {dae} | R Documentation |

## Tests whether all elements are approximately zero

### Description

A single-line `function`

that tests whether all elements are zero
(approximately).

### Usage

`is.allzero(x)`

### Arguments

`x` |
An |

### Details

The mean of the absolute values of the elements of `x`

is tested to determine if it is less than `daeTolerance`

, which is initially set to `.Machine$double.eps ^ 0.5`

(about 1.5E-08). The function `set.daeTolerance`

can be used to change `daeTolerance`

.

### Value

A `logical`

.

### Author(s)

Chris Brien

### Examples

```
## create a vector of 9 zeroes and a one
y <- c(rep(0,9), 1)
## check that vector is only zeroes is FALSE
is.allzero(y)
```

[Package

*dae*version 3.2.28 Index]