solve_theta_from_spiral_length | R Documentation |

Get theta from given spiral lengths

```
solve_theta_from_spiral_length(len, interval = NULL, offset = 0)
```

`len` |
A vector of spiral lengths. |

`interval` |
Interval to search for the solution. |

`offset` |
Offset of the spiral. In the general form: |

The length of the spiral has a complicated form, see https://downloads.imagej.net/fiji/snapshots/arc_length.pdf.
Let's say the form is `l = f(theta)`

where `f()`

is the complex equation for calculating `l`

, `solve_theta_from_spiral_length()`

tries to find theta with a known `l`

.
It uses `stats::uniroot()`

to search for the solutions.

The theta value.

```
spiral_initialize()
s = current_spiral()
theta = pi*seq(2, 3, length = 10)
theta
len = s$spiral_length(theta)
solve_theta_from_spiral_length(len) # should be very similar as theta
```

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