Macro to count numeric variables in a dataset

This macro, `%nvarsn`, acts like a function. It takes a dataset name as a parameter and returns the total number of numeric variables it contains. It relies on two sub-macros, `%varlistn` to extract the list of numeric variables and `%words` to count the number of elements in this list.

Data Analysis

Type : EXTERNE

The dataset on which the macro operates is provided as an argument ('ds') when it is called. No data is created or managed directly by the macro itself.

1 Code Block

MACRO %nvarsn

Explanation :
This block defines the `%nvarsn` macro. It accepts a `ds` argument (the dataset name). It first calls the `%varlistn(&ds)` macro to get a list of the specified dataset's numeric variable names. The result of `%varlistn` is then passed to the `%words()` macro, which counts the number of elements (words) in this list, thus returning the total number of numeric variables. The `%put` line is a diagnostic message indicating that the macro has been called.

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1	%put MACRO CALLED: nvarsn v1.0;
2
3	%macro nvarsn(ds);
4	%words(%varlistn(&ds))
5	%mend nvarsn;

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