better plotting

testing/test_all_zeros.py

@@ -0,0 +1,16 @@
+from scgenerator.math import all_zeros
+import matplotlib.pyplot as plt
+import numpy as np
+
+
+def main():
+    x = np.linspace(-10, 10, 30)
+    y = np.sin(x)
+    z = all_zeros(x, y)
+    plt.plot(x, y)
+    plt.plot(z, z * 0, ls="", marker="o")
+    plt.show()
+
+
+if __name__ == "__main__":
+    main()