1 Correction to: Iranian Journal of Science and Technology, Transactions of Electrical Engineering https://doi.org/10.1007/s40998-019-00286-4

In the article “Trajectory Tracking Control for Mobile Robots Using Reinforcement Learning and PID” by Shuti Wang, Xunhe Yin, Peng Li, Mingzhi Zhang and Xin Wang (Iranian Journal of Science and Technology, Transactions of Electrical Engineering. https://doi.org/10.1007/s40998-019-00286-4), there is an error in page 5. The erratum is to correct this error.

The initial states of mobile robot are \( \left[ {\begin{array}{*{20}l} {2.3 } & { - 2} & 2 \\ \end{array} } \right]^{T} \).

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