human
sort data by variable.
assistant
Here is a Python code to sort data by variable

import numpy as np

def sort_data_by_variable(data, variable):
    """ Sort data by variable. """
    sorted_data = sorted(data, key=lambda x: x[variable])
    return sorted_data

# Enter the data
data = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12]])

# Enter the variable
variable = 0

# Calling the function
sorted_data = sort_data_by_variable(data, variable)

#Example Output

#Remember to inspect code for bugs.