在 计算机R语言环境中，利用自定义共现函数 gx(x，y), 对表1中

In the computer R language environment, using the custom co-occurrence function gx(x, y), the co-occurrence analysis of the 35 core authors in Table 1 is carried out. Where x is the author's name, y is the author's frequency, and then the R language programming is performed to construct a 35 × 35 co-occurrence matrix. Part of the code is as follows:

In the computer R language environment, the user-defined co-occurrence function GX (x, y) is used to analyze the co-occurrence of 35 core authors in Table 1. Where x is the author's name, y is the author's frequency, and then R language programming 35 × 35, some codes are as follows:

In the computer R language environment, we use the self-defined co-occurrence function gx(x, y) to analyze the co-occurrence of 35 core authors in Table 1. X is the author's name, and y is the author's frequency. Then, the R language is programmed to build a 35 × 35 co-occurrence matrix. Some codes are as follows: