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)
, solve_theta_from_spiral_length
tries to find theta by a known l
.
It uses uniroot
to search solutions.
The theta value.
spiral_initialize() s = current_spiral() theta = pi*seq(2, 3, length = 10) len = s$spiral_length(theta) solve_theta_from_spiral_length(len) # should be very similar as theta
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