Axis Markers

[Ben Abbott]

On Oct 3, 2008, at 11:19 AM, Andrew Black wrote:

> Hi Ben,
>
> Here's an idea of what I had in mind. The scatter plot shows data
> points. One of the averages represents a weighted average of the  
> scatter
> data and the other is an average based on independent measurements of
> the same system. So, the marker's numeric values are NOT based on the
> scatter data - they are computed separately. I just want to layer  
> those
> figures on the scatter plot in an illuminative fashion.   Hope this
> clarifies. Thanks for your help!
>
> -Andrew

I think I get the idea of where you'd like to put the labels.

If you don't mind not having xticklabels representing the horizontal  
values, you can set the axis "xtick" values and "xticklabel" values to  
create.

However, it would be easier to place lines on over the scatter plot by  
doing something like ...

## create some scattered data
x = (1:9) + rand([1,9]);
y = (1:9) + rand([1,9]) ;
wgt = (5+x);
avg = mean (x);
wavg = mean (wgt.*x) ./ mean (wgt);

## plot the data
figure(1)
clf
scatter (x, y)
hold on

yt = sum([98,2].*ylim/100);

## Plot the locations for the average and weighted average and label  
them
plot ([wavg, wavg], ylim, '--k')
text (wavg, yt, 'weighted average', ...
       'horizontalalignment', 'left', ...
       'verticalalignment', 'bottom', ...
       'fontsize', 12)
plot ([avg, avg], ylim, '--k')
text (avg, yt, 'average', ...
       'horizontalalignment', 'right', ...
       'verticalalignment', 'bottom', ...
       'fontsize', 12)

Is that sufficiently close to what you want?

Ben
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