


Hello everyone,I am having a difficult time understanding what commands
are used to add and remove elements froma matrix or data frame.For ex
ample if I want to remove element=[1,50] or elements [1,50:63] or elements
 [2:4,20:35]from a matrix and replace with NA or any number what command
must I use to remove the element and then to replace the element..Must
I use two commands or can I use one command to replace the element
I read the section in the documentation on index arrays.Do I have to make
index arrays to replace elements or is there an easier way?
Any help would be appreciated     
PAUL


      
	[[alternative HTML version deleted]]

