How can I find dip direction and a dip of a plane with known normal vectors?

Hello. I have atxt file containing multiple colums and three of than being nx, ny, and nz?

Can you please help me on how to find a dip direction and a dip of a plane.

Note - some of my nz values are negative. Below I am posting a core that i wrote but it is not giving be good values for dip direction.

Thank you for your help

data = load('artificial_slope.txt') %loading data

% defining input values based of input txt file 
nx = data(:,4)
ny = data(:,5)
nz = data(:,6)

% abs vaue of nz component to eliminite minus sign 
nz_abs = abs(nz)

% dip calculation

dip_disc = acos(nz_abs)*(180/pi)


% dip direction calculation (giving wrong results)

dip_dir = (360-atan2(ny,nx) * (180/pi))-90

[KSSV]

You have not attached the text file.

[Hrvoje Lukacic]

Sorry, I am attaching it now.