I'm trying to get the maximum frequency on a histogram graph. I have a list of values. Then, I do the following:
hist(list, breaks=length(list), freq=TRUE)
and it automatically makes the ranges for the x and y axis. The y axis is the frequencies, and the x axis is the values in the list.
So, how can I find the maximum frequency that will show up on this graph?
I'm trying to make a legend in the top right corner of my graph, so I need to get the maximum frequency value. Or is there a way to tell R to put a legend box in the top right corner of a graph?
The values of a histogram can be stored as a data frame in R. Taking the OP's example dataframe 'list', you could:
list_histo <- hist(list, breaks=length(list), freq=TRUE)
simply typing
list_histo
back into R will show the new 'meta' data frame containing information about the histogram (data shown here is arbitrary and for illustration purposes):
$breaks
[1] 0.40 0.42 0.44 0.46 0.48 0.50 0.52 0.54 0.56 0.58 0.60 0.62 0.64 0.66 0.68
[16] 0.70 0.72 0.74 0.76
$counts
[1] 1 15 112 878 4734 17995 51094 110146 178855 216454
[11] 194536 130591 64218 23017 6117 1070 144 23
$intensities
[1] 0.00005 0.00075 0.00560 0.04390 0.23670 0.89975 2.55470 5.50730
[9] 8.94275 10.82270 9.72680 6.52955 3.21090 1.15085 0.30585 0.05350
[17] 0.00720 0.00115
$density
[1] 0.00005 0.00075 0.00560 0.04390 0.23670 0.89975 2.55470 5.50730
[9] 8.94275 10.82270 9.72680 6.52955 3.21090 1.15085 0.30585 0.05350
[17] 0.00720 0.00115
$mids
[1] 0.41 0.43 0.45 0.47 0.49 0.51 0.53 0.55 0.57 0.59 0.61 0.63 0.65 0.67 0.69
[16] 0.71 0.73 0.75
$xname
[1] "list_histo"
$equidist
[1] TRUE
attr(,"class")
[1] "histogram"
calling the largest value is now straightforward -- simply using
max(list_histo$counts)
will return the maximum value.