Function with label

[erwindenboer]

Hello,

I want to put a graph with a label on the screen. My code is as follows:

` from manim import *
from manim_presentation import Slide

 class Begin(Slide):
   def construct(self):
       ax = Axes(
           x_range=[-2, 5, 1],
           y_range=[-5, 5, 1],
           x_length=12,
           y_length=7,
           x_axis_config={"numbers_to_include": np.arange(-2, 6, 1)},
           y_axis_config={"numbers_to_include": np.arange(-5, 6, 1)},
           tips=False
       )

 labels = ax.get_axis_labels()
 f1 = lambda x: x**3-4*x**2+3*x+1
 func_1 = FunctionGraph(f1, color=RED)      
 func_label = ax.get_graph_label(func_1, label=func_1, direction= 2*RIGHT, x_val=1)

 self.play(FadeIn(ax, func_1, func_label))
 self.pause()
 self.wait()

`

I put my function outside the FunctionGraph(), so I can use it for the label. However, when i compile this code it gives the following error:

ValueError: Alpha -2 not between 0 and 1

I have no idea what this means. Can someone help me debug this?

[hydrobeam]

Could you post the full traceback?

[erwindenboer]

@hydrobeam Thanks for the fast response. Here is the full traceback:

PS C:\Users\Erwin\Desktop\project> manim render -pqh --fps 144.0 c:\Users\Erwin\Desktop\project\test.py
Manim Community v0.8.0

╭─────────────────────────────── Traceback (most recent call last) ────────────────────────────────╮
│ c:\users\erwin\appdata\local\programs\python\python39\lib\site-packages\manim\cli\render\command │
│ s.py:135 in render │
│ │
│ 132 │ │ for SceneClass in scene_classes_from_file(file): │
│ 133 │ │ │ try: │
│ 134 │ │ │ │ scene = SceneClass() │
│ ❱ 135 │ │ │ │ scene.render() │
│ 136 │ │ │ except Exception: │
│ 137 │ │ │ │ error_console.print_exception() │
│ 138 │ │ │ │ sys.exit(1) │
│ │
│ c:\users\erwin\appdata\local\programs\python\python39\lib\site-packages\manim_presentation\slide │
│ .py:52 in render │
│ │
│ 49 │ │ max_files_cached = config["max_files_cached"] │
│ 50 │ │ config["max_files_cached"] = float("inf") │
│ 51 │ │ │
│ ❱ 52 │ │ super(Slide, self).render(args, **kwargs) │
│ 53 │ │ │
│ 54 │ │ config["max_files_cached"] = max_files_cached │
│ 55 │
│ │
│ c:\users\erwin\appdata\local\programs\python\python39\lib\site-packages\manim\scene\scene.py:210 │
│ in render │
│ │
│ 207 │ │ """ │
│ 208 │ │ self.setup() │
│ 209 │ │ try: │
│ ❱ 210 │ │ │ self.construct() │
│ 211 │ │ except EndSceneEarlyException: │
│ 212 │ │ │ pass │
│ 213 │ │ except RerunSceneException as e: │
│ │
│ c:\Users\Erwin\Desktop\project\test.py:50 in construct │
│ │
│ 47 │ │ #horz_line_1.height = func_1(2.2153) │
│ 48 │ │ #horz_line_1.init_colors = GREEN │
│ 49 │ │ │
│ ❱ 50 │ │ ax.get_graph_label(func_1, label=func_1, direction= 2RIGHT, x_val=1) │
│ 51 │ │ #func_label_1 = ax.get_graph_label(func_2, label="3x^2-8x+3", direction= 2*LEFT, │
│ 52 │ │ │
│ 53 │ │ self.play(FadeIn(ax, func_1)) │
│ │
│ c:\users\erwin\appdata\local\programs\python\python39\lib\site-packages\manim\mobject\coordinate │
│ _systems.py:533 in get_graph_label │
│ │
│ 530 │ │ │ │ if point[1] < config["frame_y_radius"]: │
│ 531 │ │ │ │ │ break │
│ 532 │ │ else: │
│ ❱ 533 │ │ │ point = self.input_to_graph_point(x_val, graph) │
│ 534 │ │ │
│ 535 │ │ label.next_to(point, direction, buff=buff) │
│ 536 │ │ label.shift_onto_screen() │
│ │
│ c:\users\erwin\appdata\local\programs\python\python39\lib\site-packages\manim\mobject\coordinate │
│ _systems.py:462 in input_to_graph_point │
│ │
│ 459 │ │ if hasattr(graph, "underlying_function"): │
│ 460 │ │ │ return graph.function(x) │
│ 461 │ │ else: │
│ ❱ 462 │ │ │ alpha = binary_search( │
│ 463 │ │ │ │ function=lambda a: self.point_to_coords(graph.point_from_proportion(a))[ │
│ 464 │ │ │ │ │ 0 │
│ 465 │ │ │ │ ], │
│ │
│ c:\users\erwin\appdata\local\programs\python\python39\lib\site-packages\manim\utils\simple_funct │
│ ions.py:96 in binary_search │
│ │
│ 93 │ rh = upper_bound │
│ 94 │ while abs(rh - lh) > tolerance: │
│ 95 │ │ mh = np.mean([lh, rh]) │
│ ❱ 96 │ │ lx, mx, rx = [function(h) for h in (lh, mh, rh)] │
│ 97 │ │ if lx == target: │
│ 98 │ │ │ return lx │
│ 99 │ │ if rx == target: │
│ │
│ c:\users\erwin\appdata\local\programs\python\python39\lib\site-packages\manim\utils\simple_funct │
│ ions.py:96 in │
│ │
│ 93 │ rh = upper_bound │
│ 94 │ while abs(rh - lh) > tolerance: │
│ 95 │ │ mh = np.mean([lh, rh]) │
│ ❱ 96 │ │ lx, mx, rx = [function(h) for h in (lh, mh, rh)] │
│ 97 │ │ if lx == target: │
│ 98 │ │ │ return lx │
│ 99 │ │ if rx == target: │
│ │
│ c:\users\erwin\appdata\local\programs\python\python39\lib\site-packages\manim\mobject\coordinate │
│ _systems.py:463 in │
│ │
│ 460 │ │ │ return graph.function(x) │
│ 461 │ │ else: │
│ 462 │ │ │ alpha = binary_search( │
│ ❱ 463 │ │ │ │ function=lambda a: self.point_to_coords(graph.point_from_proportion(a))[ │
│ 464 │ │ │ │ │ 0 │
│ 465 │ │ │ │ ], │
│ 466 │ │ │ │ target=x, │
│ │
│ c:\users\erwin\appdata\local\programs\python\python39\lib\site-packages\manim\mobject\types\vect │
│ orized_mobject.py:1085 in point_from_proportion │
│ │
│ 1082 │ │ """ │
│ 1083 │ │ │
│ 1084 │ │ if alpha < 0 or alpha > 1: │
│ ❱ 1085 │ │ │ raise ValueError(f"Alpha {alpha} not between 0 and 1.") │
│ 1086 │ │ │
│ 1087 │ │ self.throw_error_if_no_points() │
│ 1088 │ │ if alpha == 1: │
╰──────────────────────────────────────────────────────────────────────────────────────────────────╯
ValueError: Alpha -2 not between 0 and 1.