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# Sum Rows Of 2D Array With Elements Of 1D Array Top 5 Latest Posts

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• Question: Sum rows of 2D array with elements of 1D array
• Time: Updated 23 days ago
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### Sum rows of 2D array with elements of 1D array

To sum the rows of a 2D array with the elements of a 1D array, you can use a loop to iterate over each row of the 2D array and add the corresponding element from the 1D array to each element in the row. Here’s an example implementation in Python:

```python```import numpy as np

# Define the 2D array and 1D array
arr_2d = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]])
arr_1d = np.array([10, 20, 30])

# Sum the rows of the 2D array with the elements of the 1D array
for i in range(arr_2d.shape[0]):
arr_2d[i] += arr_1d[i]

# Print the result
print(arr_2d)
``````

Output:

```lua```[[11 22 33]
[14 25 36]
[17 28 39]]
``````

In this example, we first import the NumPy library and define the 2D array `arr_2d` and the 1D array `arr_1d`. We then use a for loop to iterate over each row of `arr_2d` (i.e., the first dimension of the array) and add the corresponding element from `arr_1d` to each element in the row. Finally, we print the result.

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### How can I pass 1D array to 2D array?

To pass a 1D array to a 2D array, you need to decide on how you want to convert the 1D array into a 2D array. There are different ways to do this conversion depending on the size and shape of the 1D and 2D arrays.

One common approach is to treat the 1D array as a flattened version of the 2D array, where the elements of the 1D array are placed row-wise or column-wise in the 2D array. Here’s an example in Python:

```python```import numpy as np

# create a 1D array of size 6
arr1d = np.array([1, 2, 3, 4, 5, 6])

# reshape the 1D array into a 2D array of size (2, 3)
arr2d = arr1d.reshape((2, 3))

print(arr2d)
``````

Output:

```lua```array([[1, 2, 3],
[4, 5, 6]])
``````

In this example, the 1D array `arr1d` is reshaped into a 2D array of size (2, 3) using the `reshape` method of NumPy. The resulting 2D array `arr2d` has two rows and three columns, and its elements are populated row-wise from the original 1D array.

Note that the size of the 1D array should be compatible with the size of the 2D array that you want to create. Specifically, the total number of elements in the 1D array should be equal to the product of the number of rows and columns in the 2D array.

### How to find total number of elements in 2D array Java?

To find the total number of elements in a 2D array in Java, you need to multiply the number of rows by the number of columns. Here’s an example code snippet that demonstrates this:

```java```int[][] myArray = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};

int numRows = myArray.length; // Get the number of rows
int numCols = myArray[0].length; // Get the number of columns

int numElements = numRows * numCols; // Calculate the total number of elements

System.out.println("Total number of elements: " + numElements);
``````

In this example, we first define a 2D array called `myArray` with three rows and three columns. We then get the number of rows and columns using the `length` property of the array. Finally, we calculate the total number of elements by multiplying the number of rows by the number of columns and print it out to the console.

### Can we compare 1D array with 2D array?

It depends on the context and purpose of the comparison.

In general, 1D arrays and 2D arrays have different structures and are used for different purposes. A 1D array is a linear data structure that contains a sequence of elements arranged in a single row or column, while a 2D array is a two-dimensional data structure that contains rows and columns of elements.

If you want to compare the size or length of a 1D array and a 2D array, then you cannot compare them directly because they have different dimensions. For example, a 1D array with 10 elements would have a length of 10, while a 2D array with 10 elements arranged in 5 rows and 2 columns would have a size of 5×2 = 10.

However, you can compare the values stored in a 1D array and a 2D array if they contain the same type of elements and have the same number of total elements. In this case, you would need to decide on the appropriate way to compare them, such as comparing each element in the 1D array to the corresponding element in the 2D array or comparing some summary statistics like the average or median of both arrays.

In general, it is more common to compare 1D arrays with other 1D arrays and 2D arrays with other 2D arrays because they have different structures and serve different purposes.

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