[Bugs] #4297 Calculate LOW: Invalid reference error in plotlib

[Sugar Labs Bugs]

#4297: Invalid reference error in plotlib
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    Reporter:  lionaneesh   |          Owner:  lionaneesh                 
        Type:  defect       |         Status:  new                        
    Priority:  Low          |      Milestone:  Unspecified by Release Team
   Component:  Calculate    |        Version:  Git as of bugdate          
    Severity:  Unspecified  |       Keywords:                             
Distribution:  Unspecified  |   Status_field:  New                        
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 An invalid reference error ("x_space referenced before assignment") occurs
 in the plotting function when a N..N range is provided. (N denotes any
 number) like 1..1, 2..2 etc.

 How to Reproduce :-

 plot(sin(x),2..2)

 Fixed @ http://git.sugarlabs.org/calculate/mainline/merge_requests/2

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4297>
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