Al igual que los ejes X o Y, una leyenda es una guía: muestra a la gente cómo relacionar las propiedades visuales (estéticas) con los valores de los datos.
10.1 Quitar la leyenda
Problema
En querrás eliminar la leyenda de un gráfico.
Solución
Utiliza guides() , y especifica la escala a la que se le debe eliminar la leyenda(Figura 10-1):
# Create the base plot (with legend)pg_plot<-ggplot(PlantGrowth,aes(x=group,y=weight,fill=group))+geom_boxplot()pg_plot# Remove the legend for fillpg_plot+guides(fill=FALSE)
Figura 10-1. Aspecto por defecto (izquierda); Con la leyenda eliminada (derecha)
Debate
Otra forma de eliminar una leyenda en es establecer guide = FALSE en la escala. Esto dará exactamente el mismo resultado que el código anterior:
# Remove the legend for fillpg_plot+scale_fill_discrete(guide=FALSE)
Sin embargo, otra forma de eliminar la leyenda es utilizar el sistema de tematización. Si tienes más de un mapeado estético con una leyenda (color yshape, por ejemplo), esto eliminará las leyendas de todos ellos:
pg_plot+theme(legend.position="none")
A veces una leyenda es redundante, o se suministra en otro gráfico que se mostrará con el actual. En estos casos, puede ser útil eliminar la leyenda de un gráfico. ...
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