R help - Apr 2004 - Histogram ploting

Hi,

It's my first post on this group.
I've just started learning & using R and I like it ;-)
I have I think simple question. I'm trying to plot
a histogram for my data set.
My data set is defined as follows:

Class	N
12.5	3
17.5	10
22.5	12
27.5	8
32.5	7
37.5	3
42.5	4
47.5	2

Class means middle of set of my ranges I define.
N column stores number of measurements counted to
particular class.
And now I would like to plot a simple histogram presenting
numbers of measurements in each class.
As I read in manual, hist function takes x (my N) as the first param
but I can not identify how should I pass my
class ranged into hist function.
I believe you can understand my problem ;-)))
Could anyone help me ?

Kind regards

-- 

Mateusz ??oskot
mateusz at loskot dot net

Hello Mateusz,

The 'hist' function works on the raw data.
In your data set example, you have already computed the number of data 
points in each bin.
What you really want is probably a barplot of N

You could display your data:

plot(Class,N,'h')

Or

names(N)<-Class
barplot(N)

Christophe Pallier


 ??oskot wrote:
> Hi,
>
> It's my first post on this group.
> I've just started learning & using R and I like it ;-)
> I have I think simple question. I'm trying to plot
> a histogram for my data set.
> My data set is defined as follows:
>
> Class    N
> 12.5    3
> 17.5    10
> 22.5    12
> 27.5    8
> 32.5    7
> 37.5    3
> 42.5    4
> 47.5    2
>
> Class means middle of set of my ranges I define.
> N column stores number of measurements counted to
> particular class.
> And now I would like to plot a simple histogram presenting
> numbers of measurements in each class.
> As I read in manual, hist function takes x (my N) as the first param
> but I can not identify how should I pass my
> class ranged into hist function.
> I believe you can understand my problem ;-)))
> Could anyone help me ?
>
> Kind regards
>