Environment for creative processing of text and numerical data

Area of a regular polygon of 100 vertices plotted inside a unit circle

Beginning status (before activation):

   1 *
   2 *PI=3.141592653589793
   3 *p=100
   4 *
   5 *MAT K=ZER(p+1,2)  
   6 *MAT #TRANSFORM K BY if(J#=1)then(cos(I#/p*2*PI))else(sin(I#/p*2*PI))  
   7 *
   8 *P(x,y):=MAT_K(x,y)
   9 *Area=for(i=1)to(p)sum((P(i,1)*P(i+1,2)-P(i+1,1)*P(i,2))/2)
  10 *
  11 *Area=  
  12 *

Ending status (after activation):

   1 *
   2 *PI=3.141592653589793
   3 *p=100
   4 *
   5 *MAT K=ZER(p+1,2)
   6 *MAT #TRANSFORM K BY if(J#=1)then(cos(I#/p*2*PI))else(sin(I#/p*2*PI))
   7 *
   8 *P(x,y):=MAT_K(x,y)
   9 *Area=for(i=1)to(p)sum((P(i,1)*P(i+1,2)-P(i+1,1)*P(i,2))/2)
  10 *
  11 *Area=3.1395259764657
  12 *

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