expressing a matlab statement

[Doug Stewart]

Dr Preyesh T. Goven Shiba wrote:
> Hi
>  
> I'm a beginner with the use of matlab and octave... Can someone please 
> help me....How do i express the function y as a amtlab statement for 
> the following expression
>  
>  
> y^2 - 2y = x + 1
>  
> Thankx
> Preyesh
>  
> Email: drgovenshiba at vodamail.co.za <mailto:drgovenshiba at vodamail.co.za>
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>
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>   
I assume that x is the independent variable.
This is a quadratic in y , therefore there are two solutions  for y
y^2 -2y -x-1=0
y= (-b +- sqrt(b^2 -4ac)) /2a      the generic solution.


y1=(2+sqrt(4-4*(-x-1)))/2
or y1=1+sqrt(2+x)
and y2=1-sqrt(2+x)

hope this helps.