How to speed up IGRAPH

 

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* Example of how to speed up IGRAPH.

GET FILE='c:\\program files\\spss\\employee data.sav'.
* Round salary to nearest 10.
COMPUTE salary=RND(salary/10)*10.
AGGREGATE
  /OUTFILE=*
  /BREAK=salary
  /wgt = NU(salary).

*The file employee data has 474 cases, By multiplying the wgt variable
	(the number of cases at each salary levels) by 2,000 we are creating a file of 948,000 cases.
COMPUTE wgt=wgt*2000.
WEIGHT BY wgt.
GRAPH
  /HISTOGRAM=salary .
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