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We could restrict the function so that it only accepts fieldset dataparameters:
| Code Block | ||
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function wind_speed(u:fieldset, v:fieldset) |
This can be useful in some cases, but here for this particular example the functionality is so general that it will work with fieldsets, geopoints, numbers and vectors - so we can leave this restriction out. See the supplied Syntax Sheet for more examples of how to define functions.
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Now split the macro into file separate files: the wind_speed macro should have the function definition, and the call_wind_speed macro should read the GRIB data, call the function and plot the data (it should not work now, because it cannot find the function).
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Inclusion does not require the included macro to be a self contained program or function , - any partial fragment of code can be included, for example some variable declarations.
| Warning |
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An include statement is interpreted before the rest of the macro is executed, including lines that precede the include statement. This means that you cannot, for instance, use a dynamically generated path to find the file to be included. |
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