## Black Points in Scatter Plot

Black points in Scatter Plot graph can be caused by various factors, such as outliers, missing values, or errors in the data. In Python, you can use the following code to find black points in a graph:

```import matplotlib.pyplot as plt
import numpy as np

# Create a data set with some black points
data = np.random.randint(0, 100, (100, 2))
data[50, 0] = -1
data[50, 1] = -1

# Plot the data
plt.scatter(data[:, 0], data[:, 1])

# Find the black points
black_points = []
for i in range(len(data)):
if data[i, 0] == -1 and data[i, 1] == -1:
black_points.append(i)

# Print the black points
print(black_points)
```

This code will create a data set with 100 points and then plot the data as a scatter plot. The code will then find the black points in the data set and print them out.
To run this code, you will need to have the matplotlib and numpy libraries installed. You can install these libraries by running the following commands in your terminal:

```pip install matplotlib
pip install numpy
```

Once you have installed the libraries, you can run the code by saving it as a Python file and then running the file from the command line.
Here are some additional tips for finding black points in a graph in Python:

• Use a scatter plot matrix. A scatter plot matrix is a chart that shows the relationship between all pairs of variables in a data set. This can help you to identify any black points that may be affecting the relationship between two variables.
• Use a statistical package. There are a number of statistical packages that can help you to identify black points. These packages can also help you to plot the data points and troubleshoot the problem.
• Ask for help from a statistician. If you are still having trouble finding black points in a graph, you can ask for help from a statistician. A statistician can help you to identify the problem and develop a solution. 