Function range 

pub fn range<F>(a: F, b: F, step: F) -> Linspace<F> 
where
    F: Float,

Re-export everything from ndarray crate Return an iterator of floats from a to b (exclusive), incrementing by step.

Numerical reasons can result in b being included in the result.

The iterator element type is F, where F must implement Float, e.g. f32 or f64.

Panics if converting ((b - a) / step).ceil() to type F fails.