What is the purpose of the arrow $\leftarrow$ in this formula?


What is the purpose of the arrow $\leftarrow$ in the formula below?

$$V(S_t) \leftarrow V(S_t) + \alpha \left[ G_t - V(S_t) \right]$$

I presume it's not the same as 'equals'.


Posted 2020-02-16T17:40:08.207

Reputation: 489



I assume this is an iterative function. It means the current $V(S_t)$ is the sum of the previous plus some adjustment. The arrow is like an assignment.

In code, you would do

vst = vst + alpha * (gt - vst)

So vst will be overwritten.

Dirk Nachbar

Posted 2020-02-16T17:40:08.207

Reputation: 138

1Hi and welcome to AI SE! Thanks for trying to help. Please, use MathJax to format your equations (i.e. put your equations between two $ symbols). – nbro – 2020-02-16T18:08:08.070

Makes sense, Dirk. Thank you! – mason7663 – 2020-02-16T20:04:27.113