[R-sig-Geo] averaging X of specific Y (latitude)

[Hodgess, Erin]

Hi!

Is it a data frame, please?

Have you tried the "table" function or "cut" function?

Sincerely,
Erin

________________________________________
From: r-sig-geo-bounces at r-project.org [r-sig-geo-bounces at r-project.org] on behalf of Elaine Kuo [elaine.kuo.tw at gmail.com]
Sent: Saturday, December 15, 2012 10:15 PM
To: r-help at r-project.org; r-sig-geo
Subject: [R-sig-Geo] averaging X of specific Y (latitude)

Hello



I have a table describing butterfly range traits.

It is composed of three columns as below



Species name  range size (X)    latitude of range midpoint (Y)



There are 11 kinds of butterflies.

Each has its range size, and the latitude of each range midpoint ranges
from 9 to 19.

I would like to have the average range size of every degree of latitude.

For example, the average range size of latitude degree 10 (10.0-10.99:
Butterfly A2, B1, B2)

Please kindly help with R code to calculate the average values.

Thank you.


Elaine


The details are as followed.



Butterfly A1      130.5                 9.45

Butterfly A2      450.68                           10.2

Butterfly A3      1102.38                        9.3

Butterfly A4            893.34                             16.4

Butterfly B1           820.2                               10.54

Butterfly B2            872.2                               10.87

Butterfly B3            488.2                               16.79

Butterfly B4            620.11                             18.3

Butterfly B5            982.78                             12.98

Butterfly C1           720.32                             12.67

Butterfly C2            912.2                               18.07

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