MATLAB: Not enough input arguments – something simple i’m sure

arguments

I'm getting the above error when trying to execute this code,
close all
clear all
m = 0.05;   %mass of cone and coil together (Kg)
k = 1000;   %stiffness (N/m)
R = 1;      %damping (Ns/m
F = 1;      %Force amplitude (N)
t = 0.01;   %Time of the snapshot
f = linspace(0,99,10000); %frequency (Hz)
Zm = abs(R + 1i.*(m*2*pi.*f-k./(2*pi.*f))); %mechanical impedance
Xm = m*2*pi.*f - k./2*pi.*f;    %mechanical reactance
th = atan*(Xm/R);   %phase angle
us = F.*cos(2*pi*f*t-th);   %velocity response
What are arguments anyway? (apart from the obvious)

Best Answer

atan*(Xm/R) should be atan(Xm/R)
The expression as written is the same as
atan() * (Xm/R)
which is calling atan with no arguments (parameters)
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