sinusoid | R Documentation |

Create and display one or more sinusoids.

```
sinusoid (freqs, amps = rep(1, length(freqs)), dur = 50,
phases = rep(0, length(freqs)), fs = 10000, sum = FALSE,
show = FALSE, colors = NULL)
```

`freqs` |
A vector of frequencies, one for each desired sinusoid. |

`amps` |
A vector of peak amplitudes, one for each desired sinusoid. |

`dur` |
The desired duration of the sinusoids, in milliseconds. |

`phases` |
A vector of initial phases, one for each desired sinusoid, expressed in radians. |

`fs` |
The desired sampling frequency of the sinusoids. |

`sum` |
If TRUE, the sum the generated sinusoids is also found. |

`show` |
If TRUE, the generated sinusoids are plotted. If sum is TRUE, a second plot is created to display the sum of the sinusoids. |

`colors` |
An optional vector of colors used to plot the individual sinusoids. If the number of colors given is less than the number of frequencies specified, the colors are repeated. |

A number of sinusoids are generated, and optionally plotted and/or returned. The number of frequencies specified must equal the number of amplitudes and initial phases.

A dataframe with the following columns:

`time` |
The time, in milliseconds, at which is sample is taken. |

`waveN` |
A series of columns, each indicating the amplitude of wave N at a given time. |

`sum` |
A column indicating the sum of all of the sinusoids. |

Santiago Barreda <sbarreda@ucdavis.edu>

```
## several waves, and the sum
#sum = sinusoid (freqs = c(100,200,300), amps = c(1,3,2),
#sum = TRUE, show = TRUE)
## no sum, different phase shifts
#nosum = sinusoid (freqs = c(100,200,300), amps = c(1,3,2),
#phases = c(pi/2, 0, pi/4), sum = FALSE)
```

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