public Regress(File sourceDir,File outputDir,int width){
  this.sourceDir=sourceDir;
  this.outputDir=outputDir;
  this.width=width;
}

public Regress ( File sourceDir , File outputDir , int width ) { this . sourceDir = sourceDir ; this . outputDir = outputDir ; this . width = width ; }
initialize to read from sourcedir and generate files to outputdir , using width points to constrain layout .
