Get quadratic coefficients for pitch data

Find coefficients such that the path of the ball through time is given by: x(t) = ax * t^2 / 2 + bx * t + cx y(t) = ay * t^2 / 2 + by * t + cy z(t) = az * t^2 / 2 + bz * t + cz We start with velocity and location of ball when y = 50 and use extension to derive coefficients

Usage

get_quadratic_coef(data, source = c("statsapi", "baseballsavant"))

Arguments

data

a dataframe with the columns required for calculating the quadratic coefficients. If source = "statsapi", then ax, ay, az, vx0, vy0, vz0, x0, z0, and extension are required. If source = "baseballsavant", then ax, ay, az, vx0, vy0, vz0, release_pos_x, release_pos_y, and release_pos_z are required.

source

character string, either "statsapi" (default) or "baseballsavant"

Value

the input dataframe the following columns added: bx, by, bz, cx, cy, cz, y0, t0

Examples

data_statsapi <- download_statsapi(
  start_date = "2024-07-01",
  end_date = "2024-07-01"
)
pitch_statsapi <- data_statsapi$pitch |>
  get_quadratic_coef(source = "statsapi")

data_baseballsavant <- sabRmetrics::download_baseballsavant(
  start_date = "2024-07-01",
  end_date = "2024-07-01"
)
#> Submitting initial API requests...
#> Attempting to download 1 payload(s)...
pitch_baseballsavant <- data_baseballsavant |>
  get_quadratic_coef(source = "baseballsavant")