[R-sig-Geo] averaging X of specific Y (latitude)
Hodgess, Erin
HodgessE at uhd.edu
Sun Dec 16 06:24:01 CET 2012
Would this help you:
> butterfly
V1 V2 V3
1 A1 130.50 9.45
2 A2 450.68 10.20
3 A3 1102.38 9.30
4 A4 893.34 16.40
5 B1 820.20 10.54
6 B2 872.20 10.87
7 B3 488.20 16.79
8 B4 620.11 18.30
9 B5 982.78 12.98
10 C1 720.32 12.67
11 C2 912.20 18.07
> table(cut(butterfly$V3,breaks=9:19))
(9,10] (10,11] (11,12] (12,13] (13,14] (14,15] (15,16] (16,17] (17,18] (18,19]
2 3 0 2 0 0 0 2 0 2
>
________________________________________
From: r-sig-geo-bounces at r-project.org [r-sig-geo-bounces at r-project.org] on behalf of Hodgess, Erin
Sent: Saturday, December 15, 2012 11:11 PM
To: Elaine Kuo; r-sig-geo at r-project.org
Subject: Re: [R-sig-Geo] averaging X of specific Y (latitude)
Could you put up a little sample from your data frame? It's easier to work with then.
Erin
________________________________
From: Elaine Kuo [elaine.kuo.tw at gmail.com]
Sent: Saturday, December 15, 2012 10:26 PM
To: Hodgess, Erin
Cc: r-help at r-project.org; r-sig-geo
Subject: Re: [R-sig-Geo] averaging X of specific Y (latitude)
Hello,
Yes, it is a data frame.
This is the first time to hear "table" function or "cut" function.
Please kindly point out how to use them.
By the way,
if the dataset (data frame) includes more than 2000 kinds of butterfly range sizes and the latitude of range midpoints,
please kindly help with any suggestion to perform the task.
Thank you
Elaine
On Sun, Dec 16, 2012 at 12:20 PM, Hodgess, Erin <HodgessE at uhd.edu<mailto:HodgessE at uhd.edu>> wrote:
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<mailto:r-sig-geo-bounces at r-project.org> [r-sig-geo-bounces at r-project.org<mailto:r-sig-geo-bounces at r-project.org>] on behalf of Elaine Kuo [elaine.kuo.tw at gmail.com<mailto:elaine.kuo.tw at gmail.com>]
Sent: Saturday, December 15, 2012 10:15 PM
To: r-help at r-project.org<mailto: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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