New Plotting Functions: findall.m and allchild.m

[Bill Denney]

John W. Eaton wrote:
> | Also, I was trying to write hgsave and hgload, but I could not find a 
> | way to create a handle without using the plotting functions.  Is there a 
> | way to generate handle objects without going through the plotting functions?
>
> Not that I know of, so at least part of hgload may need to be in C++.
>
> If you could create graphics handles without generating a graph, how
> would you want to do that?  What data do you have available when you
> want to create the graphics object?
>   
Attached is what I wrote for hgsave.  I was thinking that hgload would 
essentially do what hgsave does in reverse, but assigning new handle 
numbers to everything.  It's a little more complex because there are 
child handles in places other than the children field (i.e. the title, 
xlabel, ylabel, and zlabel), but that was the general idea I had for it.

The alternative to the approach that I have there is to make 
hgsave/hgload generate what is essentially an .m file that would execute 
to generate the figure.  That struck me as likely less efficient, so I 
started with this method.

Have a good day,

Bill
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