?hist will tell you
...
breaks: one of:
             *  a vector giving the breakpoints between histogram
                cells,
             *  a single number giving the number of cells for the
                histogram,
             *  a character string naming an algorithm to compute the
                number of cells (see Details),
             *  a function to compute the number of cells.
          In the last three cases the number is a suggestion only.
2006/2/17, Michael <comtech.usa at gmail.com>:> Hi all,
>
> I am doing histogram using the "hist" function. For some reason,
the
> histogram does not look good... is there a way I can change the number of
> bins, and/or change the way that data gets binned... so that I can obtain a
> better looking histogram?
>
> Thanks a lot!
>
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--
伝伷伻佡伖侒
Deparment of Sociology
Fudan University