How to get a daily mean : <p>I got the following question. Currently I am working with RStudio and i want to get a daily mean, however I just started to learn Rstudio and don't know how to continue...</p>

<p>my data set looks like this:</p>

<ol>
<li>row (day): 2019-12-01; 2019-12-01; 2019-12-02; 2019-12-02; 2019-12-02; 2019-12-03;.....</li>
<li>row (value): 1; 2; 3; 1; 3; 3; 1;...</li>
</ol>

<p>And i want my dataset to look like this:</p>

<ol>
<li>row (day): 2019-12-01; 2019-12-02; 2019-12-03;.....</li>
<li>row (average_value): 1; 2; 3;....</li>
</ol>

<p>Which Code do I need to get it like that? Can someone help me?
Thank you very much!!</p>
