[R] order intervals in a data.frame

[João Fadista]

Dear all,
 
I would like to know how can I order a data.frame with increasing the 
dat$Interval (dat$Interval is a factor). There is an example below.
 
Original data.frame:
 
> dat
                 Interval               Number_reads
                  0-100                         685
               200-300                         744
               100-200                        1082
               300-400                        4213
 
 
>Desired_dat:
 
                 Interval               Number_reads
                  0-100                          685
                100-200                       1082
                200-300                         744              
                300-400                       4213
 
 
 
 
 
Thanks in advance.

Best regards,
João Fadista

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