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This function defines a function that converts the index of effective degree (degree k, with e neighbors being infected) to a linear index in an array of state variables.

<project-file type=“source”/> <content> #ifndef KE_INDEX_H #define KE_INDEX_H

inline int ke_index(int k, int e) {

  return ((k-1)*(k-1+3)/2 + e + 1);

}

#endif </content>