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Programming an interaction

Certainly due to my lack of competence this code

pol = polygon([(0,0), (0,10), (10,10), (0,0)], fill=True,> rgbcolor=(0.81,0.81,0.81))

g = plot(x,(0,10),color="blue",ymin=0,ymax=10)

@interact

def _(c=slider(0,1,step_size=0.2,default=.5),inac=checkbox(True,"Domaine Inaccessible")):
a = solve(-c*x+6==x, x)

aa = a[0].right()

h = plot(-c*x+6,(aa, 6),color="green",ymin=0,ymax=10)

graph = h+g 

if inac :

    graph += pol    

 show(graph)

conplains that graph is not defined.

Is there some thing I have not understood in the construction of @interact?

Programming an interaction

Certainly due to my lack of competence this code

pol = polygon([(0,0), (0,10), (10,10), (0,0)], fill=True,> fill=True, rgbcolor=(0.81,0.81,0.81)) g = plot(x,(0,10),color="blue",ymin=0,ymax=10) g = plot(x,(0,10),color="blue",ymin=0,ymax=10) @interact def _(c=slider(0,1,step_size=0.2,default=.5),inac=checkbox(True,"Domaine Inaccessible")): @interact def _(c=slider(0,1,step_size=0.2,default=.5),inac=checkbox(True,"Domaine Inaccessible")): a = solve(-c*x+6==x, x) aa = a[0].right() h = plot(-c*x+6,(aa, 6),color="green",ymin=0,ymax=10) graph = h+g if inac : graph += pol show(graph)

 conplains that graph is not defined.
 Is there some thing I have not understood in the construction of @interact?