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d.pizza is a data frame. It's a column named temperature contains only numbers. If you extract temperature using the [] accessors, its class defaults to numeric. How can you access temperature so that it retains the class of data.frame?> class( d.pizza[ , 'temperature' ] )> 'numeric'

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d.pizza is a data frame. It's a column named temperature contains only numbers. If you extract temperature using the [] accessors, its class defaults to numeric. How can you access temperature so that it retains the class of data.frame?<br><br>> class( d.pizza[ , 'temperature' ] )<br>> 'numeric'<br>






 
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