Matplotlib axes label

[John Henry]

On Mar 1, 9:53 pm, attn.steven.... at gmail.com wrote:
> On Mar 1, 3:10 pm, "John Henry" <john106he... at hotmail.com> wrote:
>
> > I've been asking this question at the matplotlib user list and never
> > gotten an answer.  I am hoping that there are matplotlib users here
> > that can help.
>
> > My problem with matplotlib's way of handling axes label is illustrated
> > by this example:
>
> >http://www.scipy.org/Cookbook/Matplotlib/MulticoloredLine
>
> > Notice that the y-axis goes from (-1.1, 1.1) but the first label is at
> > -1.0.
>
> (snipped)
>
> > Is there a way to force the label to start at -1.1 instead of -1.0?
>
> > Thanks,
>
> You can try adjusting the labels and ticks
> using matplotlib.ticker.
>
> To the example you cited, one can add
>
> from matplotlib.ticker import MultipleLocator, FormatStrFormatter
>
> # ...
>
> minorLocator = MultipleLocator(0.1)
> minorFormattor = FormatStrFormatter('%0.1f')
> ax.yaxis.set_minor_locator(minorLocator)
> ax.yaxis.set_minor_formatter(minorFormattor)
>
> show()
>
> --
> Hope this helps,
> Steven


Thank you for the response.  Yes, adding those lines did work.

But what exactly is going on here?  Why would adding these two lines
works?

Thanks,