问题
I've build the following test app where I solve the issue to get the tick labels as scientific annotation, but I would now like to reduce the number of grid lines to only be placed at the "main" ticks, i.e. the ones that have a text label. This question was posted based on discussion / comment on this previous SO question
I would like to find a way that works for both 2D and 3D plotly scatter plots since I am using both.
Here is the 3D app.
library(shiny)
library(plotly)
shinyApp(
ui = fluidPage( plotlyOutput('plot') ),
server = function(input, output) {
output$plot <- renderPlotly ({
mtcars <- rbind(mtcars, mtcars*1000, mtcars/1000) #create data with big logarithmic range
maxlog <- round(log10(max(mtcars[['mpg']][mtcars[['mpg']]>0], mtcars[['disp']][mtcars[['disp']]>0],mtcars[['cyl']][mtcars[['cyl']]>0])), digits = 0) +1 # determine max log needed
minlog <- round(log10(min(mtcars[['mpg']][mtcars[['mpg']]>0], mtcars[['disp']][mtcars[['disp']]>0],mtcars[['cyl']][mtcars[['cyl']]>0])), digits = 0) -1 # determine min log needed
logrange <- (maxlog - minlog)*9 +1 # get the distance between smallest and largest log power
tval <- sort(as.vector(sapply(seq(1,9), function(x) x*10^seq(minlog, maxlog)))) #generates a sequence of numbers in logarithmic divisions
ttxt <- rep("",length(tval)) # no label at most of the ticks
ttxt[seq(1,logrange,9)] <- formatC(tval, format = "e", digits = 2)[seq(1,logrange,9)] # every 9th tick is labelled
p <- plot_ly(source = 'ThresholdScatter')
p <- add_trace(p, data = mtcars,
x = mtcars[['mpg']],
y = mtcars[['disp']],
z = mtcars[['cyl']],
type = 'scatter3d',
mode = 'markers',
marker = list(size = 2))
p <- layout(p, autosize = F, width = 500, height = 500,
scene = list(yaxis = list(type="log",
zeroline=F, showline=T,
ticks="outside",
tickvals=tval,
ticktext=ttxt),
xaxis = list(type="log",
zeroline=F, showline=T,
ticks="outside",
tickvals=tval,
ticktext=ttxt),
zaxis = list(type="log",
zeroline=F, showline=T,
ticks="outside",
tickvals=tval,
ticktext=ttxt),
camera = list(eye = list(x = -1.5, y = 1.5, z = 1.5))))
})
}
)
and the same but in 2D
library(shiny)
library(plotly)
shinyApp(
ui = fluidPage( plotlyOutput('plot') ),
server = function(input, output) {
output$plot <- renderPlotly ({
mtcars <- rbind(mtcars, mtcars*1000, mtcars/1000) #create data with big logarithmic range
maxlog <- round(log10(max(mtcars[['mpg']][mtcars[['mpg']]>0], mtcars[['disp']][mtcars[['disp']]>0])), digits = 0) +1 # determine max log needed
minlog <- round(log10(min(mtcars[['mpg']][mtcars[['mpg']]>0], mtcars[['disp']][mtcars[['disp']]>0])), digits = 0) -1 # determine min log needed
logrange <- (maxlog - minlog)*9 +1 # get the distance between smallest and largest log power
tval <- sort(as.vector(sapply(seq(1,9), function(x) x*10^seq(minlog,
maxlog)))) #generates a sequence of numbers in logarithmic divisions
ttxt <- rep("",length(tval)) # no label at most of the ticks
ttxt[seq(1,logrange,9)] <- formatC(tval, format = "e", digits = 2)[seq(1,logrange,9)] # every 9th tick is labelled
p <- plot_ly(source = 'ThresholdScatter')
p <- add_trace(p, data = mtcars,
x = mtcars[['mpg']],
y = mtcars[['disp']],
type = 'scatter',
mode = 'markers',
marker = list(size = 2))
p <- layout(p,autosize = F, width = 500, height = 500,
yaxis = list(type="log",
zeroline=F, showline=T,
ticks="outside",
tickvals=tval,
ticktext=ttxt),
xaxis = list(type="log",
zeroline=F, showline=T,
ticks="outside",
tickvals=tval,
ticktext=ttxt))
})
}
)
回答1:
For the 2D scatterplot, you can draw your own grid lines using the shapes option in layout. You also then suppress the gridlines using showgrid = FALSE.
shinyApp(
ui = fluidPage( plotlyOutput('plot') ),
server = function(input, output) {
hline <- function(y = 0, color = "grey", width=0.1) {
list(type = "line", x0 = 0, x1 = 1, xref = "paper",
y0 = y, y1 = y, line = list(color = color, width=width))
}
output$plot <- renderPlotly ({
mtcars <- rbind(mtcars, mtcars*1000, mtcars/1000) #create data with big logarithmic range
maxlog <- round(log10(max(mtcars[['mpg']][mtcars[['mpg']]>0], mtcars[['disp']][mtcars[['disp']]>0])), digits = 0) +1 # determine max log needed
minlog <- round(log10(min(mtcars[['mpg']][mtcars[['mpg']]>0], mtcars[['disp']][mtcars[['disp']]>0])), digits = 0) -1 # determine min log needed
logrange <- (maxlog - minlog)*9 +1 # get the distance between smallest and largest log power
tval <- sort(as.vector(sapply(seq(1,9), function(x) x*10^seq(minlog,
maxlog)))) #generates a sequence of numbers in logarithmic divisions
ttxt <- rep("",length(tval)) # no label at most of the ticks
ttxt[seq(1,logrange,9)] <- formatC(tval, format = "e", digits = 2)[seq(1,logrange,9)] # every 9th tick is labelled
p <- plot_ly(source = 'ThresholdScatter')
p <- add_trace(p, data = mtcars,
x = mtcars[['mpg']],
y = mtcars[['disp']],
type = 'scatter',
mode = 'markers',
marker = list(size = 2))
p <- layout(p,autosize = F, width = 500, height = 500,
yaxis = list(type="log",
zeroline=F, showline=T, showgrid=F,
ticks="outside",
tickvals=tval,
ticktext=ttxt),
xaxis = list(type="log",
zeroline=F, showline=T, showgrid=F,
ticks="outside",
tickvals=tval,
ticktext=ttxt),
shapes = lapply(10^(-1:6), hline))
})
}
)
Unfortunately, I don't think you can use this approach in the 3d plot, as shapes do not have a z dimension. You could do something similar using add_lines instead of shapes, but this won't be quite as neat.
回答2:
In Python, for the 3D plot, specify all Layout attributes within a scene dict, as following:
layout = go.Layout(
margin=dict(
l=0,
r=0,
b=0,
t=0
),
scene=dict(
xaxis=dict(
type='log',
autorange=True,
title='L1'))
)
I'd assume the same functionality exists in R for the latest version of plotly.
来源：https://stackoverflow.com/questions/54612142/reduce-number-of-gridlines-in-plotly-scatter-plots-with-log-scale-in-r-shiny