How to sum a two-dimensional array or matrix using PHP language

In PHP development, the operation of summing two-dimensional arrays or matrices is often involved. Such operations are usually used for statistical data or calculation of eigenvalues ​​of matrices, etc. This article will introduce how to use PHP language to sum two-dimensional arrays or matrices.

Two-dimensional array summation

A two-dimensional array is composed of an outer array and several inner arrays. Each inner array contains the same number of elements and can be viewed as a matrix. To find the sum of a two-dimensional array is to find the sum of all its elements.

You can usually use a for loop or foreach loop to traverse a two-dimensional array, and the sum of the two-dimensional array can be found by accumulating the value of each element. The following is a sample code that uses a foreach loop to find the sum of a two-dimensional array:

The output of the above code is: The sum of the array is: 45

Matrix summation

Matrix is ​​a data set consisting of a number table with m rows and n columns. For an m×n matrix A and the corresponding n×1 vector b, matrix summation refers to calculating the sum of all elements of A, or the sum of all elements of b.

For an m×n matrix A, you can use a double loop to traverse each element and accumulate them to get the sum of the matrix. The following is an example code for using a for loop to find the sum of matrices:

The output result of the above code is: The sum of the matrix is: 45

For the n×1 vector b, you can directly Use a for loop to iterate through each element and add them up to get the sum of the vectors. The following is an example code for using a for loop to find the sum of vectors:

The output of the above code is: The sum of the vector is: 15

Summary

In this article , we introduced how to sum a two-dimensional array or matrix using PHP language. For two-dimensional arrays, you can use a for loop or a foreach loop to iterate through each element and add them up. For matrices, you can use a double loop to go through each element and add them up. For vectors, you can directly use a for loop to iterate through each element and add them up. These operations can be useful in things like statistics or calculating the eigenvalues ​​of a matrix.

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