Mathematical modelling of an outbreak of zombie infection

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In 2009, Munz et al. [1] have written a pedagogical paper that helps to understand how to solve systems of coupled differential equations. it dealt with the simulation of zombie infection among the human population. I have re-written the Matlab code they propose in their paper. The present code is made of:
- one example file
- one zombies.m function that implements (partly) the model proposed by Munz et al.
- one erad.m function that is based on the "impulsive eradication" model.
There are no guarantees that the code I have written is reliable. If any doubt, please refers to the original one.

[1] Munz, Philip, et al. "When zombies attack!: mathematical modelling of an outbreak of zombie infection." Infectious Disease Modelling Research Progress 4 (2009): 133-150