Description Usage Arguments Value Examples

View source: R/fitTimeSeries.R

Compute the area of a function with values 'y' at the points 'x'. Function comes from the pracma package.

1 | ```
trapz(x, y)
``` |

`x` |
x-coordinates of points on the x-axis |

`y` |
y-coordinates of function values |

Approximated integral of the function from 'min(x)' to 'max(x)'. Or a matrix of the same size as 'y'.

1 2 3 4 5 6 7 8 9 10 11 | ```
# Calculate the area under the sine curve from 0 to pi:
n <- 101
x <- seq(0, pi, len = n)
y <- sin(x)
trapz(x, y) #=> 1.999835504
# Use a correction term at the boundary: -h^2/12*(f'(b)-f'(a))
h <- x[2] - x[1]
ca <- (y[2]-y[1]) / h
cb <- (y[n]-y[n-1]) / h
trapz(x, y) - h^2/12 * (cb - ca) #=> 1.999999969
``` |

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