Add factors to a flash fit object based on data.

Computes the current residuals from data and f_init and adds K new factors based on init_fn applied to these residuals. (If f_init is NULL then the residuals are the data).

flash_add_factors_from_data(data, K, f_init = NULL, init_fn = "udv_si")

Arguments

data	A flash data object.
K	Number of factors to add.
f_init	An existing flash fit object to add to.
init_fn	The function to use to initialize new factors (typically some kind of svd-like function).