[R] Questions about sort data

[Xiao Zhao]

Dear R users,
I am doing my project which I want to plot a piecewise function, I knew
that I can use the command segments to plot. But the problem is I want
to use my real data which needs me to sort of my data by using the 'if
else'command, I use it 
If(t[i]36) lambda-0.5
Else lambda-0.2
The funny thing is when I look at my data set, it did not follow my
command to sort data, also the final numbers do not change either.
The other problem is I have a big data set, sometimes I want to know the
number of some data, such as how many numbers are over 60, how to do
this by using R?
Does anybody got any ideas about my two pros?

Thank you in advance
Best wishes
Nessie^_^

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[R] question

[Xiao Zhao]

Hello,
I am a research student and I am using R to access my research. I want
to know how to multiple plot , such as for the exponetial distribution,
if I give the covariate different value, how to plot these in the same
figure,
And also I want to add the density plot in the histogramm.
How to do these?
Thank u in advance
nessie

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