By Mark Jerrum
Textual content constituted of notes originating in a postgraduate lecture sequence given by way of the writer on the ETH in Zurich within the Spring of 2000. Covers the counting of combinatorial constructions and comparable themes, seen from a computational viewpoint. Softcover.
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Additional resources for Counting, sampling and integrating: algorithms and complexity
For example, %let state=%str( North Carolina); %let town=%str(Taylor%’s Pond); %let store=%nrstr(Smith&Jones); %let plotit=%str( proc plot; plot income*age; run;); The definition of macro variable TOWN demonstrates using %STR to mask a value containing an unmatched quotation mark. “Macro Quoting Functions” on page 158 and Chapter 7, “Macro Quoting,” on page 77 discuss macro quoting functions that require unmatched quotation marks and other symbols to be marked. 25 The definition of macro variable PLOTIT demonstrates using %STR to mask blanks and special characters (semicolons) in macro variable values.
Both statements assign values to the macro variable NEW: %let new=inventry; %macro name1; %let new=report; %mend name1; Suppose you submit the following statements: %name1 data &new; These statements produce the following statement: data report; Because NEW exists as a global variable, the macro processor changes the value of the variable rather than creating a new one. The macro NAME1’s local symbol table remains empty. The following figure illustrates the contents of the global and local symbol tables before, during, and after NAME1’s execution.
Instead, you might need to delimit the reference by adding a period to the end of it. A period immediately following a macro variable reference acts as a delimiter. That is, a period at the end of a reference forces the macro processor to recognize the end of the reference. The period does not appear in the resulting text. TEMP. temp; run; */ After macro variable resolution, SAS sees these statements: DATA &NAME1 &NAME2; SET INSALESTEMP; RUN; None of the macro variable references have resolved as you intended.