# mlbench.spirals

From mlbench v2.1-1
by Friedrich Leisch

##### Two Spirals Benchmark Problem

The inputs of the spirals problem are points on two entangled spirals. If
`sd>0`

, then Gaussian noise is added to each data
point. `mlbench.1spiral`

creates a single spiral.

- Keywords
- datagen

##### Usage

```
mlbench.spirals(n, cycles=1, sd=0)
mlbench.1spiral(n, cycles=1, sd=0)
```

##### Arguments

- n
- number of patterns to create
- cycles
- the number of cycles each spiral makes
- sd
- standard deviation of data points around the spirals

##### Value

- x
- input values
- classes
- factor vector of length
`n`

with target classes

`"mlbench.spirals"`

with components
##### Examples

`library(mlbench)`

```
# 1 cycle each, no noise
p<-mlbench.spirals(300)
plot(p)
#
# 1.5 cycles each, with noise
p<-mlbench.spirals(300,1.5,0.05)
plot(p)
```

*Documentation reproduced from package mlbench, version 2.1-1, License: GPL-2*

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