r - ggplot2: Use options for multiple plots -

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i create 10 plots have different data, same optical appearance. example, i’d change colour of gridline each plot. done adding 

+ opts(panel.grid.major = theme_line(colour = "white")

to each plot definition. however, when decide change background colour let’s “grey25”, i’d have modify each plot individually. seems way work. ;)

so, thought doing like

opt1 <- '+ opts(panel.grid.major = theme_line(colour = "white")'

and define each plot like

pl_x <- pl_x + opt1 pl_y <- pl_y + opt1 ...

other options (margins, fonts, scales,…) added opt1. however, doesn’t work (error message when trying print pl_x). maybe knows how accomplish i’d do?

i played around theme_set , theme_update, resulted in none off plots working anymore unless restarted r.

you don't have add + sign. 

opt <- opts(panel.grid.major = theme_line(colour = "white"))  pl_x <- pl_x + opt

although doesn't work: 

opt <- opts(...) + scale_y_continuous(..)

this does: 

opt <- opts(...) syc <- scale_y_continuous(...) pl_x <- pl_x + opt + syc

and hadley's example, works too: 

opt <- list(opts(...),scale_y_continuous(...))

note: since version 0.9.2 opts has been replace theme.


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