r - Adjust labels of ggplot2 legend -


i've been searching internet last couple of hours not find solution works me. i'm new r , think miss something.

i try use ggplot2 draw simple plot file in csv format (;-separated).

here script wrote:

library(ggplot2) library(reshape)  df = read.csv2('test.csv', dec='.') column_names = colnames(df)  # melt data each row unique id-variable combination df = melt(df, id=c(column_names[1]))  # plot data ggplot(data=df, aes(x=df[, 1], y=value, colour=variable, shape=variable)) +   geom_point() + # add points   geom_line() + # add initial line plot   xlab('x') + # set xlabel   ylab('y') + # set ylabel   ggtitle('mytitle') + # set title   scale_x_log10(breaks=df[[column_names[1]]]) + # df[[]] accesses atomic column))   theme_minimal() +   theme(legend.position="right", legend.title=element_blank())

and test input, test.csv:

column 1;column 2;column 3 111.12;4313.5;6678.25 222.9;9386.0;12372.5

so far, - plot generated. legend contains entries column.2 , column.3. know due make.names when file opened using read.csv2 function.

however, did not find out how can modify legend entries such names in csv file presented there, i.e., column 2 , column 3.

i tried extract colnames before make.names applied , use scale_* function did not succeed:

library(ggplot2) library(reshape)  df = read.csv2('test.csv', check.names=f, dec='.')  column_names_str = colnames(df)[-1]  colnames(df) = make.names(colnames(df)) column_names = colnames(df)  # melt data each row unique id-variable combination df = melt(df, id=c(column_names[1]))  # plot data ggplot(data=df, aes(x=df[, 1], y=value, colour=variable, shape=variable)) +   geom_point() + # add points   geom_line() + # add initial line plot   xlab('x') + # set xlabel   ylab('y') + # set ylabel   ggtitle('mytitle') + # set title   scale_x_log10(breaks=df[[column_names[1]]]) + # df[[]] accesses atomic column))   theme_minimal() +   theme(legend.position="right", legend.title=element_blank()) +   scale_colour_hue(labels=column_names_str)

the above script changes labels splits legend 2 parts (shape , colour). keep combined legend (shape , colour) proper labels.

here did:

ggplot(data=df, aes(x=df[, 1], y=value, colour=variable, shape=variable)) + geom_point() + # add points geom_line(show.legend = true) + # add initial line plot xlab('x') + # set xlabel ylab('y') + # set ylabel ggtitle('mytitle') + # set title scale_x_log10(breaks=df[[column_names[1]]])  # df[[]] accesses atomic column)) #theme_minimal() + #theme(legend.position="right", legend.title=element_blank()) + #scale_colour_hue(labels=column_names_str)

and result was: only 1 legend group

please check if looking for.


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