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A function file may contain secondary functions called subfunctions. These secondary functions are only visible to the other functions in the same function file. For example, a file f.m containing
function f ()
printf ("in f, calling g\n");
g ()
endfunction
function g ()
printf ("in g, calling h\n");
h ()
endfunction
function h ()
printf ("in h\n")
endfunction
defines a main function f and two subfunctions. The
subfunctions g and h may only be called from the main
function f or from the other subfunctions, but not from outside
the file f.m.