On 15/03/2020 6:42 p.m., Abby Spurdle wrote:
I think people have misinterpreted the question.
The OP wants local maxima from the series.

The original series is frequencies, so your table is frequencies of frequencies.

A solution can be derived by looking at signs of the first and second
differences.
But there may be a simpler way????

Presumably this is a homework question. Your answer is perfect for one of those; more detail would be inappropriate.

Duncan Murdoch


On Mon, Mar 16, 2020 at 10:24 AM Jim Lemon <drjimle...@gmail.com> wrote:

Hi Ding,
Translating this into R code:

freq<-c(1,2,5,5,10,4,4,8,1,1,8,8,2,4,3,1,2,1,1,138,149,14,1,1)
table(freq)
freq
  1   2   3   4   5   8  10  14 138 149
  8   3   1   3   2   3   1   1   1   1
library(prettyR)
Mode(freq)
[1] "1"

You have a single modal value (1). If there were at most two ones, you
would have three values (2,4,8) that could be considered multiple
modes. What you seem to be doing is considering values that are not
separated by commas as modes. Perhaps this is a formatting problem
with your email.

Jim

On Mon, Mar 16, 2020 at 7:55 AM Yuan Chun Ding <ycd...@coh.org> wrote:

Hi R users,

I want to find multiple modes (10, 8, 149) for the following vector.

freq =1,2,5,5  10,4,4,8,1,1,8,8,2,4,3,1,2,1,1 138 149  14,1,1;

any suggestion?

Thank you,

Ding

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