#!F-adobe-helvetica-medium-r-normal--18*
#!N
#!CNavyBlue #!N #!Rexavgc AverageCell Module
Example--Average the Data Values of All Neighbors #!N #!EC #!N #!N
The AverageCell module computes, for each cell, the average of the
data values of that cell and all its neighbors. #!N Note:
This module works only on data that is cell-centered (i.e., connection-dependent)
and has connections of type "quads." #!N #!N #!N The AverageCell
module takes one input: #!F-adobe-times-bold-r-normal--18* input #!EF , of type #!F-adobe-times-bold-r-normal--18*
field #!EF , which has no default value. The module has
one output: #!F-adobe-times-bold-r-normal--18* output #!EF , of type #!F-adobe-times-bold-r-normal--18* field #!EF
. #!N #!N #!F-adobe-times-bold-r-normal--18* (1) START THE MODULE BUILDER #!EF with
the command: __________________________________ #!CForestGreen #!N #!N #!F-adobe-courier-bold-r-normal--18* #!N dx -builder #!EF
#!N #!N #!EC #!N #!N The Module Builder dialog box appears.
Note that the dialog box carries no information, since no module
has been specified. (For a simple example of creating a module
with the Module Builder, see #!Ltmodbld,dxall1006 h Using the Module Builder: A Quick Walk Through #!EL ). #!N #!N #!F-adobe-times-bold-r-normal--18* (2)
SELECT ___________ #!F-adobe-times-bold-r-normal--18* OPEN #!EF #!EF from the _______________________ #!F-adobe-times-bold-r-normal--18* File
#!EF pull-down menu. An #!F-adobe-times-bold-r-normal--18* Open a Module Builder file... #!EF
dialog box appears. #!N #!N #!F-adobe-times-bold-r-normal--18* (3) READ IN #!EF /usr/lpp/dx/samples/program_guide/averagecell.mb
as follows: __________________ #!N #!I0 #!N #!F-adobe-times-medium-r-normal--18* #!N #!N #!I30 #!N
o Type the full path name in the #!F-adobe-times-bold-r-normal--18* Filter #!EF
field of the dialog box. #!N #!I30 #!N o Click on
(in sequence): #!N #!I0 #!N #!F-adobe-times-medium-r-normal--18* #!N #!N #!I30 #!N -
the #!F-adobe-times-bold-r-normal--18* Filter #!EF button #!N #!I30 #!N - the name
of the file in the #!F-adobe-times-bold-r-normal--18* Files #!EF field #!N #!I30
#!N - the #!F-adobe-times-bold-r-normal--18* OK #!EF button. #!N #!I0 #!N #!EF
#!N Information describing the inputs and output of the module (extracted
from the averagecell.mb file) appears in the Module Builder dialog box.
#!N #!I0 #!N #!EF #!N #!N #!N #!F-adobe-times-bold-r-normal--18* (4) SAVE THE
.MB FILE #!EF to a writable directory (use ___________________________ #!F-adobe-times-bold-r-normal--18* Save
As... #!EF in the #!F-adobe-times-bold-r-normal--18* File #!EF pull-down menu). #!N #!N
#!F-adobe-times-bold-r-normal--18* (5) SELECT #!EF ________________ #!F-adobe-times-bold-r-normal--18* Create All #!EF from the
#!F-adobe-times-bold-r-normal--18* Build #!EF pull-down menu of the dialog box. This option
creates three files for the module: averagecell.c, averagecell.mdf, and averagecell.make, #!N
#!N #!F-adobe-times-bold-r-normal--18* (6) IMPLEMENT THE AVERAGECELL FUNCTION #!EF . ____________________________________________ #!N
#!N Use an editor to add the following lines after "User's
code goes here" in the averagecell.c file: #!CForestGreen #!N #!N #!F-adobe-courier-bold-r-normal--18*
#!N int *itemcounts = NULL, i, neighbor; #!N #!N /* make
scratch space to hold the number of items added for each
element */ #!N itemcounts = DXAllocate(input_knt*sizeof(int)); #!N if (!itemcounts) #!N goto
error; #!N #!N /* #!N * first initialize the output data
component to zero, and itemcounts to #!N * zero. #!N */
#!N for (i=0; i<input_knt; i++) { #!N output_data[i] = 0; #!N
itemcounts[i]=0; #!N } #!EF #!N #!N #!EC #!CForestGreen #!N #!N #!F-adobe-courier-bold-r-normal--18*
#!N /* for each data value, add that value to the
appropriate items in the #!N * output data array. Also increment
itemcounts for those cells. #!N */ #!N for (i=0; i<input_knt; i++)
{ #!N /* first do itself */ #!N output_data[i]+=input_data[i]; #!N itemcounts[i]++;
#!N #!N /* now do neighbors in fastest-varying dimension */ #!N
neighbor = i-1; #!N if (neighbor >= 0 && ((i %
(c_counts[1]-1)) != 0)) { #!N output_data[neighbor]+=input_data[i]; #!N itemcounts[neighbor]++; #!N } #!EF
#!N #!N #!EC #!CForestGreen #!N #!N #!F-adobe-courier-bold-r-normal--18* #!N neighbor = i+1;
#!N if (neighbor < input_knt &&(((i+1)%(c_counts[1]-1)) != 0)) { #!N output_data[neighbor]+=input_data[i];
#!N itemcounts[neighbor]++; #!N } #!N #!N /* now do neighbors in
the slowest-varying dimension */ #!N neighbor = i - (c_counts[1]-1); #!N
if (neighbor >= 0) { #!N output_data[neighbor]+=input_data[i]; #!N itemcounts[neighbor]++; #!N }
#!N neighbor = i + (c_counts[1]-1); #!N if (neighbor < input_knt)
{ #!N output_data[neighbor]+=input_data[i]; #!N itemcounts[neighbor]++; #!N } #!N } #!EF #!N
#!N #!EC #!CForestGreen #!N #!N #!F-adobe-courier-bold-r-normal--18* #!N /* now divide by
the number of items added for that cell */ #!N for
(i=0; i< input_knt; i++) #!N output_data[i] = output_data[i]/itemcounts[i]; #!N #!N DXFree((Pointer)itemcounts);
#!N return OK; #!N error: #!N DXFree((Pointer)itemcounts); #!N return ERROR; #!N
} #!EF #!N #!N #!EC #!N #!N The file /usr/lpp/dx/samples/program_guide/averagecell.c contains
a completed version of this program. #!N #!N #!F-adobe-times-bold-r-normal--18* (7) TO
CREATE A VERSION OF DATA EXPLORER THAT INCLUDES #!EF the AverageCell
module, enter the command: ____________________________________________________________ #!CForestGreen #!N #!N #!F-adobe-courier-bold-r-normal--18* #!N make
-f averagecell.make dxexec #!EF #!N #!N #!EC #!N #!N (You have
now created an executable that contains the AverageCell module.) #!N #!N
#!F-adobe-times-bold-r-normal--18* (8) TO INVOKE THIS VERSION, ENTER: #!EF _________________________________________ #!CForestGreen #!N
#!N #!F-adobe-courier-bold-r-normal--18* #!N dx -edit -mdf ./averagecell.mdf -exec ./dxexec #!EF #!N
#!N #!EC #!N #!N This command starts Data Explorer (the averagecell.mdf
file tells the graphical user interface about AverageCell and its inputs
and outputs). The executable dxexec invoked here is the one created
in Step 6. #!N #!N #!F-adobe-times-bold-r-normal--18* (9) WITH THIS VERSION OF
DATA EXPLORER #!EF you can now run any visual program that
uses the AverageCell module. ____________________________________________ One such program is /usr/lpp/dx/samples/program_guide/averagecell.net #!N
#!N #!N #!F-adobe-times-medium-i-normal--18* Next Topic #!EF #!N #!N #!Limptd,dxall1036 h Importing Data #!EL #!N #!F-adobe-times-medium-i-normal--18*
#!N
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