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{alias:lgo}
h2. Name

*lgo* — Logical operation between two grids

h2. Syntax
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*lgo* _lgo\_number_ *lo | hi* _workspacename_

{panel}

h2. Description

Logical grid to grid operation performed between active grid and a grid in a workspace. 

h2. Arguments

_lgo_number_ 
{indent}Logical operation number. The numbers are from 1 to 10 as explained below.{indent}

{info:title=Logical operation numbers}
              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
{info}
            
*lo* 
{indent}Result grid is active dataset.{indent} 
*hi* 
{indent}Result grid is placed in workspace _workspacename_.{indent} 
_workspacename_ 
{indent}Name in workspace of second grid.{indent}  

h2. See also

[add], [sub], [mul], [rep]