These functions work with files and other I/O tasks.
Anchor append
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none append append ( string,any,... )
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Writes output to a file specified by its name or by a filehandler previously assigned to it by the file() function. The output file type depends on the type that is being written - in exactly the same way as it does for the write() function (see below). As the name implies, append() never overwrites previously existing output.
Anchor exist exist
number exist ( string )
This function checks whether a file or directory exists. The single argument is the file or directory name - you must specify the full path . The function returns a number, 1 if the file exists and 0 otherwise. Use it combined with fail() or stop() for error checking :
if (not(exist("/home/xy/xyz/metview/grib_file"))) then fail("specified input file does not exist!")end if(...)
Anchor file
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filehandler file file ( string )
Assigns a file handler to a file whose name is the function argument. The file handler can be used in place of the file name in file output functions - write() and append() .
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none newpage newpage newpage ( display window )
Forces a new page to be taken in the current PostScript file.
Anchor print
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none print print (...)
Prints all its arguments to the output area of the main user interface (and to that of any opened macro editor window).
Anchor read
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fieldset read read ( string )observations read ( string )geopoints read ( string )list read ( string )netcdf read ( string )
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The variable of type list is used to hold the contents of an ASCII file - the elements of this list variable are themselves lists, each holding a line of text. The elements of these sub lists are the text line tokens (component strings) arising from the parsing of the text.
table read_table ( definition )Anchor read_table read_table
Reads an ASCII table-based file such as a comma separated value (CSV) file. Use the Table Reader icon to construct the input definition for this function.
Anchor tmpfile
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string tmpfile tmpfile ( )
Reserves and returns a unique file name (inside the Metview cache directory) for a temporary file. Returned filenames are unique even when there are several copies of the same macro being executed simultaneously.
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none write write write ( string,any,... )none write ( filehandler,any,... )
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