+ + + =

plot 制图

For example :

1. to fill sin(x) , select the fill checkbox, then click the plot button
   
2. to unfill sin(x) , unselect the fill checkbox, then click the plot button
   
3. for implicit function of x and y, e.g. sin(x)-y
   
4. for plot of two functions f1(x) and f2(x), the two function must have the y variable, (y-f1(x))*(y-f2(x)), e.g. (y*y+x*x-1)*(y*y+x*x-t-2)
   
5. to fill y-f(x) + abs(y-f(x)), the function must have the y variable, e.g. (x*x+y*y-1)+abs(x*x+y*y-1) ,
6. for disc, disc(1)
7. for ring, ring(1,2)
8. for change of color with contour3D, e.g. contour3D( y-sin(x-t) )
   
9. for equation, input sin(x)-cos(y)=0 or sin(x)-cos(y)
   
10. for derivative of sin(x), input ds(x=>sin(x),x)
    
11. for second order derivative of sin(x), input ds(x=>sin(x),x,2)
    
12. for the 0.5 order derivative = semi derivative, input ds(x=>sin(x),x,0.5)
    
13. for the -0.5 order derivative = semi integral, input ds(x=>sin(x),x,-0.5)
    

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• Example :