Course of Raku / Essentials / Functions essentials / Creating and calling functions / Exercises / Function table

Solution: Function table

This program is, probably, a good example of using the loop loop. With it, you can set both the edges and the step directly in the units you need. Note that you can return to this task later after learning Raku sequences.

Code

Here is the solution:

sub f($x) { $x² }

loop (my $x = -3; $x <= 3; $x += 0.1) {
    say "$x\t{f($x)}";
}

🦋 Find the program in the file function-table.raku.

Output

The program prints a long list of the x — f(x) table. A part of this output is shown here:

$ raku exercises/functions/function-table.raku
-3	9
-2.9	8.41
-2.8	7.84

. . .

-0.2	0.04
-0.1	0.01
0	0
0.1	0.01
0.2	0.04

. . .

2.7	7.29
2.8	7.84
2.9	8.41
3	9

Visualisation

It is wise to visualise the output with some external program, for example, Excel or gnuplot.

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