Automatically adjust y_zero and y_zero_line if necessary
sv_y_zero_adjust(y_var_vctr, y_balance, y_zero, y_zero_line)A vector of values for the y scale.
Add balance to the y axis so that zero is in the centre of the y scale. Only applicable where facet_scales equals "fixed" or "free_y".
TRUE or FALSE whether the minimum of the y scale is zero. Defaults to TRUE.
TRUE or FALSE whether to add a zero reference line to the y axis. Defaults to NULL, which is TRUE if there are positive and negative values in y_var. Otherwise it is FALSE.
Generate a list of y_zero and y_zero_line elements that are adjusted if necessary.
A list with first element y_zero (TRUE or FALSE) and second element y_zero_line (TRUE or FALSE)