#PLOT ON SAME GRAPH R SERIES#

This adds “bla” and “rebla” on two points you just clicked on in the graphical device. But here is an example: text( locator(2), # you will be able to click twice on the graph c('bla','rebla')) # the two strings of character we want to add More details about this function in the section Getting information from your graph. Interestingly, it is also possible to use the function “ locator()” to specify the coordinates where the text should be plotted. Have you noticed the unexpected “ ” between “freeware” and “rocks” when we input the text information in the function? And more interestingly, have you noticed how it doesn’t appear in the graph? This combination of characters indicates to R that the text after “ ” should be printed on another line. The font is specified with numbers, where 1 is for a normal font (the default), 2 for bold, 3 for italic, and 4 for bold and italic. Here, our first piece of text will be red, the second green and the third blue. Consequently, colors and fonts for each piece of text can be specified with vectors containing information for each text element (vectors will be recycled as necessary if shorter than the labels’ vector). See for yourself: plot(x=c(-5,5),y=c(-5,5),type='n') # plotting an empty plot text(x=c(-3.5,0,3.5),y=c(4,0,-4), # Entering x-y coordinates for 3 points labels=c('Dear Matlab','Freeware rocks','Sincerely, R'), # text to add to the existing plot col=c('red','green','blue'), # modifying text colors font=c(3,1,2), # modifying text fonts cex=1.5) # modifying character sizeĪs you can see, it is possible to enter different pieces of text at the same time by using a vector of character strings as input for the “labels” argument. As with most of graphical functions, it accepts basic arguments to suit your outcome to your mood! You can for example change the character expansion of the text, its color, or the font with arguments “cex”, “col” and “font” respectively. There might be something else to it, but if yes, I don’t know what.Īdding text to a graph: the “text()” functionįeeling bold? You want to add information to your graph? R got what you want! You just need to bring 2 information with you: the text you want to add, and where you want to add it! Easy, right? Once that gathered, the “ text()” function will do the rest of the work for you. Well, as far as I know, they are just to make things easy when you want to do one or the other, without having to worry about setting a type in a counter-intuitive way. “Wait a minute Flo! The points() function can make lines, and the lines() function can make points? Isn’t it weird? Isn’t it redundant? Bottom line, what’s the point?” lines(x,y+5,col='red',lwd=3)Īnd on a side note, this can be used to simply add other data points, when we set type=”p” lines(x,y+10,type='p',col='blue') plot(x,y,type='l') # Reminder: type='n' means 'none', and doesn't display the points, exactly same syntax as with 'plot()'. Its syntax is exactly like the one used for “ plot()“. The “lines()” function allows you to add, guess what! Lines! In all other cases, you specify the intercept and the slope with the arguments “a” and “b” respectively. For a horizontal line, you enter the y-value through the argument “h”. The function “abline()” will be useful when you need to add a straight line to a graph.įor a vertical line, you enter the x-value through the argument “v”. Its syntax is exactly like the one used for “ plot()“ plot(father~student,col='blue') points(mother~student,pch='+',col='red')Īnd on a side note, this can be used to trace a line that links your data points, when we set type=”l” plot(x,y,type='n') # Reminder: type='n' means 'none', and doesn't display the points, exactly same syntax as with 'plot()'. The “points()” function allows you to add, guess what! Points! And of course, graphical parameters already presented can be incorporated in those functions. Three functions are commonly used to perform those tasks. Once a graph is plotted, it is often useful to add new elements such as another set of data points (for another sample for example), or lines. The only thing she left behind, laying in a puddle thicker than the cheap whisky I kept hidden in the top drawer of my desk, was a note scribbled on a match box…

#PLOT ON SAME GRAPH R SERIES#

What was she doing? The last time I met her was during the investigation of a series of poorly executed Excel graphs… Then, she confessed: As the slow glow of a cigarette being lighted up was illuminating her face, she said: “We meet again.” I was surprised to see her, here, at that time, in LA of all places.

Plot on same graph r