I would like to do something similar to [matplotlib.pyplot.matshow](https://matplotlib.org/examples/pylab_examples/matshow.html) with racket. I understand this is a trivial question and maybe I'm just being stupid, but I was unsuccessful after reading the Racket plotting documentation.

An example matrix that would be translated into the image of a circle:

```
#lang typed/racket

(require math/array)
(require plot)

(: sq (-> Integer Integer))
(define (sq [v : Integer])
  (* v v))

(: make-2d-matrix (-> Integer Integer (Array Boolean)))
(define (make-2d-matrix [s : Integer] [r : Integer])
  (let ([center : Integer (exact-round (/ s 2))])
    (let ([a (indexes-array ((inst vector Integer) s s))])
      (let ([b (inline-array-map (λ ([i : (Vectorof Index)])
                            (+
                             (sq (- (vector-ref i 0) center))
                             (sq (- (vector-ref i 1) center))))
                          a)])
        (array<= b (array (sq r)))
        ))))

(array-map (λ ([i : Boolean]) (if (eq? i #f) 0 1)) (make-2d-matrix 20 6))

```

Can someone give me a hint?