Plotlib - overview
axis - get/set axis limits                     
background  - change background
bar - draws vertical bargraph
caxis - set/get color axis
clf - clear a figure                         
colormap - Set/get the colormap of currently active figure
delete - deletes a figure                      
fig - creates/activates a figure.              
foreground  - change foreground
gcw - get the number of active window
grid - property : add a grid on a 2D graph
hold - holds/releases current plot             
legend - adds a legend         
loglog - plot with logarihtmic x andy scale    
mesh - 3D mesh surface.
pcolor - 2D pseudo color patches
plot - generic plot function.                  
plot3 - Plot lines and points in 3-D space.    
plotlibver - returns the plotlib version number
semilogx - plot with logarihtmic x scale       
semilogy - plot with logarihtmic y scale       
shg - brings the current window forward.
subplot -  Create axes in tiled positions.     
surf - 3D colored surface.                    
surfl - 3D surface with lighting              
title - adds a title on top of a graph         
triplot - 2D plot of a triangulation
trimesh  - 3D surface mesh based on a triangulation
tripcolor - 2D pseudo color patches based on a triangulation        
trisurf - 3D colored surface based on a triangulation
trisurfl - 3D surface based on a triangulation, with lightning 
whitebg - Set the default color scheme
view - property for 3D graphs : sets the view point
xlabel - adds a label on x axis                
ylabel - adds a label on y axis                
