Hello,
 
I was trying to import data from an Excel file. After I imported the data, I was trying to make a scatter plot. 
 
The X axes variable is a time variable, which occupies two columns, one is date, another one is time. Example 21-Apr-03, 4:10 PM.   My qestion is:
 
1. How can I access the data of certain column? I mean how can I refer it in R?
2. How can I make the two column character values(the time variable I mentioned) to the X ases values?
3. If I have three variables, one is y axes, one is x axes,  the third one is a logic var, how can I make the logic varaible on the plot also?
4. I have a column of number values, however I want to creat a new column, the value of each cell is the average of every 10 values of the first column. How can I do it in R?
 
I tried to figure it out in the help section, however, it spent me a lot of times, I still can not get the way out, please help. THank you!



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