Ggplot2 - I can't insert the chart legend

SlowLearning

Good evening everybody, The data are:

Data      X     Y
01/01/16 17073 229
01/02/16 16094 375
01/03/16 17380 880
01/04/16 19993 9978
01/05/16 26290 24782
01/06/16 32982 36437
01/07/16 38490 42547
01/08/16 36688 43928
01/09/16 22799 36734
01/10/16 15000 11816
01/11/16 10494 680
01/12/16 10944 434
01/01/17 17217 235
01/02/17 15501 466
01/03/17 19236 1608
01/04/17 22239 8490
01/05/17 30390 23374
01/06/17 35579 34568
01/07/17 39613 43283
01/08/17 44089 44741
01/09/17 25542 35611
01/10/17 16357 10131
01/11/17 11754 541
02/12/17 11583 362

I have a little problem with my chart.

I wrote this code:

ggplot() 
+ geom_line(data=DB_Reg, aes(x=DB_Reg$Data,
 y=DB_Reg$X), color='435',size=0.5, show.legend = TRUE)+
geom_line(data=DB_Reg, aes(x=DB_Reg$Data, y=DB_Reg$Y),color='534',size=0.5, show.legend = TRUE)+
ggtitle("XY")+
  xlab("Dates")+
ylab("Quantity")+
geom_point()

I'd like to put the legend about the two lines. I wrote show.legend=TRUE for the two lines, but doesn't work.

Jo Harris

When using ggplot it is very important to ensure the code is written in the correct order. For example, adding geom_point() at the end is going to overwrite the previous argument. Try removing it. Here is a script that should work.

  ggplot(data=DB_Reg)+
  geom_line(mapping=aes(y=X,x= Data,color="X"),size=1 ) +
  geom_line(mapping=aes(y=Y,x= Data,color="Y"),size=1) +
  scale_color_manual(values = c(
    'X' = 'darkblue',
    'Y' = 'red')) +
  labs(color = 'Y series')

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edited at2020-12-5

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