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{alias:igg}
h2. Name

*igg* — Interpolated grid to grid operation

h2. Syntax
{panel:|borderStyle=solid|borderWidth=1|bgColor=#FFFFAA}

*igg add | sub | mul | div | lt | gt | rep* \[*und*] _workspacename_

{panel}

h2. Description

General grid to grid operation that does not require that the grids involved has the same size and position. 

h2. Arguments

_workspacename_ 
{indent}Name in workspace where the second grid is present. Must always be present.{indent} 
*add* 
{indent}The grids are added.{indent} 
*sub* 
{indent}The grid in _workspacename_ is subtracted from the active grid.{indent} 
*mul* 
{indent}The grids are multiplied.{indent} 
*div* 
{indent}The active grid is divided by the grid in _workspacename_.{indent} 
*lt* 
{indent}The result grid in active will be minimum of either of the two grids.{indent} 
*gt* 
{indent}The result grid in active will be maximum of either of the two grids.{indent} 
*rep* 
{indent}Replace all undefined areas with values from grid in workspacename.{indent} 
*und* 
{indent}Undefined values returned from the interpolation should be used in the new dataset.{indent}

h2. Examples

h3. Ex.1: Adding grids of unequal dimension

{noformat:|borderWidth=1|bgColor=#eeeeee}
        # Adding grids of unequal dimension
       
z                    ;# Erase screen
     
  win demo             ;# Get demo window (450000 460000 6450000 6460000 1000 4000)
       
spe bgc whi          ;# Specify background color to white
    
   mak ran 12 z 100 700 ;# Make 12 random points between 100 and 700
       
grp 222 222          ;# Make grid of dimension 222 x 222
   
    eli gt 500           ;# Eliminate greater than 500
       
mhi mygrid           ;# Save the grid
  
     ewi 25               ;# Expand the grid 25% in xy direction
       
mak ran 11           ;# Make 11 random points
 
      grp 300 300          ;# Make grid of dimension 300 x 300
       
bol 2                ;# Draw the border layout

       igg sub mygrid       ;# Add the two grids of different dimension together
       
ssc                  ;# Scale new dataset
       
acm n 11 sma         ;# Map the result grid using color bands
{noformat}

The above example produces this image.

!att:_img_ref^cmd_igg.png!
_Border layout of adding grids and result grid_

h2. See also

[add - Add to dataset] , [eli - Eliminate points] , [rep - Replace] , [und - Undefined change]
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