r - "guides", "colourbar" and "keyheight" in ggplot2 -


using ggplot2 made barplot in each bars filled gradient. problem concerns legend of plot. bar filled same colour gradient:

scale_fill_gradient(     low = "lightpurple",     high = "black",     limits = c(0, max(graph$y)),     "colourbar")

when wanted change height of legend bar tried instead:

scale_fill_gradient(     low = "lightpurple",     high = "black",     limits = c(0, max(graph$y)),     guides("colourbar", guide_legend(keyheight = 2))

but nothing changed. , when precise height of bar without colour gradient, height correct.

scale_fill_gradient(     low = "lightpurple",     high = "black",     limits = c(0, max(graph$y)),     guide = guide_legend(keyheight = 2))

what did wrong when mentioning both "colourbar" , "height" in "guides"?


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