growth.intervals | R Documentation |

For the vector of values resulting from the evaluation of a function, this function determines the positions of the values between which the vector grows.

```
growth.intervals(x, y, zeroSlope = 0.01)
```

`x` |
a vector of values. |

`y` |
the vector of the corresponding values of a function for the |

`zeroSlope` |
maximum slope (in degrees) required to consider that a growing function is constant. |

The `growth.intervals`

function ignores the pairs of values between which the vector `y`

starts and stops growing if the slope is less than `zeroSlope`

.

This function returns NULL if the vector `y`

is not growing. Otherwise, the
function computes a matrix of indexes with two columns. The first column
contains the positions of the values from which the vector `y`

starts growing and the
second column those at which the vector `y`

stops growing.

Patricia Román-Román, Juan J. Serrano-Pérez and Francisco Torres-Ruiz.

```
u <- seq(0, 5, length = 200)
v <- sin(u)
w <- growth.intervals(u, v)
w
plot(u, v, type = "l", las = 1)
abline(v = u[as.vector(w)])
## Continuing the FPTL(.) examples:
growth.intervals(y$x, y$y)
growth.intervals(y$x, y$y, zeroSlope = 0.001)
```

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