我在更改 mcmc_areas 函数生成的图形中的 y 轴值时遇到了一些麻烦。我的目标是更改文本并更新 y 轴值以包括希腊语下标字母。在可以使用 R 中的 bayesplot 包创建的其他图形中，我可以很容易地做到这一点。
例如:
#I pull out my posterior draws
posterior<-as.matrix(fit.lv2)
#I grab just the parameters of interest for the moment
gamma.b0<-posterior[,c('gamma[1,1]',
'gamma[1,2]',
'gamma[1,3]',
'gamma[1,4]')]
#I rename the columns
colnames(gamma.b0)<-c('Intercept~(gamma[0][0])',
'DN~(gamma[0][1])',
'Pos~Events~(gamma[0][2])',
'Neg~Events~(gamma[0][4])')
#And finally I plot the posterior density for each parameter of interest
b0.g1<-mcmc_dens(gamma.b0, facet_args = list(labeller=ggplot2::label_parsed))
它产生:
到现在为止还挺好。但是我无法弄清楚如何使用
mcmc_areas() 函数使绘图重现相同的文本。我已经尝试过 yaxis_text 和 yaxis_ticks ，这两个似乎都不是我想要更新 y 轴上的值的方式。我要么收到警告，要么收到列名完全复制的 mcmc_areas 图的某个版本(这与我想要的审美相去甚远):
任何想法或建议都非常感谢。
数据如下:
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0.113504166406202, 0.0691274320090004), .Dim = c(250L, 4L), .Dimnames = structure(list(
iterations = NULL, parameters = c("Intercept~gamma[0][0]",
"DN~gamma[0][1]", "Pos~Events~gamma[0][2]", "Neg~Events~gamma[0][4]"
)), .Names = c("iterations", "parameters")))
最佳答案
您需要添加 scale_y_discrete在那里你将现有的标签映射到表达式，这些标签只是“Intercept~gamma[0][0]”。有点努力，但它有效。
对于上述示例，它的工作方式如下:
library("ggplot2")
library("bayesplot")
mcmc_areas(gamma.b0) + scale_y_discrete(labels=c(
"Intercept~gamma[0][0]" = expression(paste("Intercept~",gamma[0][0])),
"DN~gamma[0][1]" = expression(paste("DN~",gamma[0][1])),
"Pos~Events~gamma[0][2]" = expression(paste("Pos~Events~",gamma[0][2])),
"Neg~Events~gamma[0][4]" = expression(paste("Neg~Events~",gamma[0][4]))
))
gamma.b0取自 dput的问题启动器。然后看起来像这样:
只需忽略
Scale for 'y' is already present警告。它只是通知您，您正在覆盖比例。但是，这就是我们想要的。如果我们拥有完全控制权，我们当然只会替换对 scale_y 的第一次调用，但由于它隐藏在包中的某个地方，我们必须覆盖它。
关于r - 从 bayesplot R 包更改 mcmc_areas() 图中的 y 轴文本，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/48631486/