Why does it give the error: Undefined function or variable 'arctanh'. Is there another way to use arctanh for my hyperbolic function?

function calc_vel = freefalljumper(in_mass, in_time, in_drag)

grav = 9.8; b = 0.425; init_vel = 0; calc_vel = sqrt(in_mass grav/(b * in_drag)) *tanh(in_time * sqrt((b * in_drag)*grav/in_mass)) + ..., arctanh(init_vel sqrt((b * in_drag)/ in_mass * grav));

Answer 1

[madhan ravi]

Try :

atanh

[Loreal Anderson]

Thanks, I wasn't sure if it was the same thing.