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lgo lgo_number lo | hi workspacename

Assume the grids are zlo and zhi.
Assume relations b1=zlo_is_defined

and

zhi_is_defined.

b2=zlo_is_defined.

b3=zlo_is_undefined.

v is the new grid node.

1: if ( b1 ) v = max(zlo,zhi)

2:

if

(

b1

)

v

=

min(zlo,zhi)

3:

if

(

b3

)

v

=

zhi
4:

if

(

!b1

)

v

=

undefined
5:

if

(

!(

b1

and

zhi

lt

zlo

)

and

!(

b1

and

zlo

lt

zhi

)

)

v

=

zhi
6:

if

(

!(

b1

and

zhi

gt

zlo

)

and

!(

b1

and

zlo

gt

zhi

)

)

v

=

zhi
7:

if

(

b1

and

zhi

lt

zlo

)

v

=

zhi
8:

if

(

b1

and

zlo

gt

zhi

)

v

=

zlo
9:

if

(

b1

and

zlo

gt

zhi

)

v

=

undefined
10:

if

(

zhi

gt

zlo

)

v

=

undefined