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At first, with an editor
Because pad2ps series are tools to draw PAD figures from a text file, you first need to create a PAD source using an editor. A PAD source is written following PADEL(PAD Expression Language) syntax. The detail about PADEL is fully described in Chapter 3, so I will give you one example for now. The following file will produce the PAD figure in Figure 1. If you are familiar to C language, you probably notice the source resembles C syntax; To draw PAD figure with pad2ps series, you need to create C-like file like this one.
Addition from 1 to N { input N if(N > 1){ sum = 0 for(i = 1 , N){ sum = sum + i } print sum } } Let's save this file as foo.pad.
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