CODEWITHSUNDEEP
r
user1723765
user1723765

Reputation: 6409

Using tabulate() with numbers with decimals

I have a vector

a<- c(0.2849579, 0.2849579, 0.2849579)

I would like to use:

tabulate(a,nbins=max(a))

but this returns integer(0) as output.

Can tabulate be used for numbers with decimals?

Upvotes: 1

Views: 519

Answers (2)

Martin Morgan
Martin Morgan

Reputation: 46876

Here are some random numbers, replicated

x = sample(runif(10), 1000, TRUE)

Find the unique (optionally, rounding to significant figures) values, then find the index of each x in the table of unique values and tabulate those

## x = signif(x, 6)
ux = sort(unique(x))
idx = match(x, ux)
n = tabulate(idx, nbins=length(ux))

finally, summarize the results

df = data.frame(x=ux, n=n)

Use the summary to see all counts

> head(df)
           x   n
1 0.02832152 108
2 0.04973473  90
3 0.19770913  96
4 0.31591234 103
5 0.59334322  97
6 0.64145901  98

or identify values with maximum counts

> df[df$n ==  max(df$n), , drop=FALSE]
           x   n
10 0.9711141 127

Upvotes: 1

user3072164
user3072164

Reputation:

The value of nbins determines the number of bins in which the numbers are put. Since max(a) = 0.2849579 there will be zero bins and therefore your result is to be expected.

Also the help page for tabulate (called with ?tabulate) says:

If the elements of ‘bin’ are numeric but not integers, they are truncated to the nearest integer.

Depending on your problem you may want to upscale your decimals first and then apply tabulate. Or you might want to use hist or something like that instead.

Upvotes: 0

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