[R] Create histogram from data matrix

[Paul Warren Simonin]

Hello!
   Thanks for reading this request for assistance. I have a question  
regarding creating a histogram-like figure from data that are not  
currently in the correct format for the "hist" command.
   Specifically, my data have been processed and are in a matrix with  
columns containing the variables of interest and separate columns  
containing the number of times this variable was observed (counts).  
This data frame/matrix is rather large (1600 rows), and there are  
multiple rows corresponding to the same variable level (e.g.,  
"temperature=8, 5 observations" in one row, then the next:  
"temperature=8, 9 observations", and so on). In other words, the data  
are not one long vector R can read and plot as a histogram, nor are  
they condensed. My goal is to create a figure in which one axis is  
bins (e.g., temperature values) and the other is number of  
observations in this bin (e.g., number of organisms seen).
   My question is: Is there a way R can be told to read my data to  
create a plot like that I desire? So far I have tried several options,  
including bar plots with no success.

   If there is no way to do this with my data as the are currently  
arrange, is there an efficient way to re-arrange them?

Thanks a lot for any assistance or advice!

Sincerely,
Paul Simonin


-- 
Paul W. Simonin
Graduate Research Assistant, MS Program
Vermont Cooperative Fish and Wildlife Research Unit
The Rubenstein School of Environment and Natural Resources
University of Vermont
81 Carrigan Dr.
Burlington, VT 05405
Ph:802-656-3153