Subplot Handle

Initialisation of subplot function that only requires row and col or index in the following

Creating large subplots with changing organization can be tedious and erronious.
With this simple handle you can manage your subplots easily. Moreover, you can come back easily to your figure without managing the figure handle.

Usage:
- h = SUBPLOT_HANDLE( 2,3 ) generates subplot handle for 2 rows and 3 cols
- h(1,2) will then generate a subplot in row 1 and col 2 of this figure (even if you use a different figure in the meanwhile)
- h(1) will create a subplot with original indexing in row 1 col 1, and iterates thence through all further subplots

Example:
h = subplot_handle( 2,1 );
h(1); % similar to h(1,1)
fplot( @(x) sin(x), [-pi pi] );
h(2); % similar to h(2,1)
fplot( @(x) cos(x), [-pi pi] );