How to fix ValueError Expected 2D array got 1D array instead?

The error message is pretty clear, Reshape your data either using array. reshape(-1, 1) if your data has a single feature or array. reshape(1, -1) if it contains a single sample.

How do you reshape a 1D array to a 2D array?

Use numpy. reshape() to reshape a 1D NumPy array to a 2D NumPy array. Call numpy. reshape(a, newshape) with a as a 1D array and newshape as the tuple (-1, x) to reshape the array to a 2D array containing nested arrays of x values each.

How do you convert a 2D array in Python?

How to Reverse a 1D & 2D numpy array using np. flip() and [] operator in Python

1. import numpy as np. import numpy as np.
2. Reversed Array : [11 8 2 4 3 9 18 2 4 1 6] Reversed Array : [11 8 2 4 3 9 18 2 4 1 6]
3. arr[start:end:stepsize] arr[start:end:stepsize]
4. numpy.
5. Reversed Array : [11 8 2 4 3 9 18 2 4 1 6]

How do you convert a list to an array in Java?

Java program to convert a list to an array

1. Create a List object.
2. Add elements to it.
3. Create an empty array with size of the created ArrayList.
4. Convert the list to an array using the toArray() method, bypassing the above-created array as an argument to it.
5. Print the contents of the array.

How do you convert a 1D array to a 2D array in CPP?

“convert 1d array to 2d array c++” Code Answer’s

1. for ( int i=0; i
2. cin >> a[i][j]; }
3. for (int y=0; y
4. cout << a[x][y] << endl; }

How do you convert 2D to 1D?

Use numpy. array. flatten() to convert a 2D NumPy array into a 1D array

1. print(array_2d)
2. array_1d = array_2d. flatten() flatten `array_2d`
3. print(array_1d)

What is difference between Vstack and Hstack function?

The major difference is that np. hstack combines NumPy arrays horizontally and np. vstack combines arrays vertically.

How do you reverse a 1D array in Python?

flipud() to reverse a one-dimensional NumPy array. Call numpy. flipud(m) with m as a one-dimensional NumPy array to reverse m .

How do you reverse a 2D array element?

Program to reverse the rows in a 2d Array

1. Initialise the start index as 0 and end index as N-1.
2. Iterate loop till start index is less than ending index, swap the value at these indexes and update the index as: