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Convert radiation pattern from phi/theta form to u/v form

`pat_uv = phitheta2uvpat(pat_phitheta,phi,theta)`

`pat_uv = phitheta2uvpat(pat_phitheta,phi,theta,u,v)`

```
[pat_uv,u_pat,v_pat]
= phitheta2uvpat(___)
```

expresses
the antenna radiation pattern `pat_uv`

= phitheta2uvpat(`pat_phitheta`

,`phi`

,`theta`

)`pat_phitheta`

in u/v space coordinates
instead of φ/θ
angle coordinates. `pat_phitheta`

samples
the pattern at φ angles in `phi`

and θ
angles in `theta`

. The `pat_uv`

matrix
uses a default grid that covers *u* values from –1
to 1 and *v* values from –1 to 1. In this
grid, `pat_uv`

is uniformly sampled with a step
size of 0.01 for *u* and *v*. The
function interpolates to estimate the response of the antenna at a
given direction. Values in `pat_uv`

are NaN for *u* and *v* values
outside the unit circle because *u* and *v* are
undefined outside the unit circle.