Broken Line

Definition has the following format:

(x₁,y₁)±(x₂,y₂)±(x₃,y₃)± . . .

where (x₁,y₁) specifies the first node, (x₂,y₂) specifies the second node etc. If nodes are linked with plus sign, the points are connected with a segment. In case of minus sign, the segment remains invisible.

Examples:

(0,1)+(1,0)+(0,-1)+(-1,0)+(0,1)           ; square

(-1,-1)+(-1,1)-(1,-1)+(1,1)                   ; two parallel segments

Each coordinate of each node may be specified with an expression. If expression is used, it should not (after evaluation) contain variable   

Example:

in Calc Window

y=x^2                                      ; define function

x1=0   y1=y                             ; coordinates of the first point

x2=1   y2=y                             ; coordinates of the second point

x3=2   y2=y                             ; coordinates of the third point

In Graph Window, define broken line as

(x1,y1)+(x2,y2)+(x3,y3)

You can assign the whole node to a variable.

Example:

in Calc Window

y=x^2                                      ; define function

x=0   p1=(x,y)                         ; first point

x=1   p2=(x,y)                         ; second point

x=2   p3=(x,y)                         ; third point

In Graph Window, define broken line as

p1+p2+p3

Finally, you can assign the whole definition to a variable

Example:

in Calc Window

y=x^2                                      ; define function

x=0   L=(x,y)                           ; first point

x=x+1 L=L+(x,y)                    ; repeat several times – next points

In Graph Window, define broken line as

L