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2.4 Other data structures2.4 Other data structures 23There are many other data structures available within GenStat, each with appropriateattributes. A single numerical value is stored within a scalar. A two dimensional arrayof data is contained in a matrix, and the two specialized forms of matrices (symmetric ordiagonal) can also be used. Numerical results of cross tabulations or analyses are storedin tables that are indexed by a number of classifying factors. Pointers store references to(i.e. "point" to) sets of other data structures. A dummy stores a reference to a single datastructure. Expressions define numerical calculations, and formulae define statisticalmodels.Full details about allof GenStat's datastructures are given inChapter 2 of the Guidet o t h e G e n S t a tCommand Language,Part 1 Syntax and DataManagement. To openthis within GenStat,click on the Syntax andData Management suboptionof the GenStatGuides option of the Help Figure 2.9menu on the menu bar,as shown in Figure 2.9.The Guide explainsthe syntax of thedirectives that "declare"(i.e. define) the varioustypes of data structure,and has exampleprograms to show theiruse. They can beaccessed using one ofthe examples menus,opened by clicking onthe Syntax and DataManagement sub-optionof the Examples optionof the Help menu on theFigure 2.10menu bar (Figure 2.10).