10.9.6: Solitary Operators

The solitary operators are illustrated below, in alphabetical order.

{rpn argc}

Yields number of command-line arguments given by the user when Gri was invoked. Thus, invoking Gri as

gri myfile.gri file1.dat file2.dat

yields 3, for arguments `myfile.gri', `file1.dat', and `file2.dat'. These arguments are accessible through the `argv' unary operator (see Unary Operators).

{rpn e}

Yields the base of natural logarithms, i.e. `2.718'...

{rpn pi}

Yields Pi, i.e. `3.141'...

{rpn rand}

Generate a random number in the range 0 to 1, using the C subroutine `drand48()' if it is available, otherwise the less well-distributed `rand()' subroutine.

{rpn wordc}

Returns number of words used in invoking the present command. Similar to the `\.words.' synonym (see Local Synonyms). Example:

`let us test .it.' { show "This command has " {rpn wordc} " words" } let us test 10 let us test {rpn 3 1 +} let us test "this" let us test "this thing"

The operator `wordv' may be used to extract the words of the command (see Unary Operators).