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5.1 Functions defined on the command-line
Functions can be defined by entering code on the command line, a feature not supported by the other leading brand. For example, you may type:
octave:1> function s = hello_string (to_who)
> ## Say hello
> if nargin<1, to_who = "World"; end
> s = ["Hello ",\
> to_who];
> endfunction
octave:2> hello_string ("Moon")
ans = Hello Moon
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