Prints one or more expressions expr_1, …, expr_n as a Fortran 90 program. Output is printed to the standard output.
f90 prints output in the so-called "free form" input format for
Fortran 90:
there is no special attention to column positions.
Long lines are split at a fixed width with the ampersand & continuation
character.
load("f90") loads this function. See also the function fortran.
Examples:
(%i1) load ("f90")$
(%i2) foo : expand ((xxx + yyy + 7)^4);
4 3 3 2 2 2
(%o2) yyy + 4 xxx yyy + 28 yyy + 6 xxx yyy + 84 xxx yyy
2 3 2
+ 294 yyy + 4 xxx yyy + 84 xxx yyy + 588 xxx yyy + 1372 yyy
4 3 2
+ xxx + 28 xxx + 294 xxx + 1372 xxx + 2401
(%i3) f90 ('foo = foo);
foo = yyy**4+4*xxx*yyy**3+28*yyy**3+6*xxx**2*yyy**2+84*xxx*yyy**2&
+294*yyy**2+4*xxx**3*yyy+84*xxx**2*yyy+588*xxx*yyy+1372*yyy+xxx**&
4+28*xxx**3+294*xxx**2+1372*xxx+2401
(%o3) false
Multiple expressions.
Capture standard output into a file via the with_stdout function.
(%i1) load ("f90")$
(%i2) foo : sin (3*x + 1) - cos (7*x - 2);
(%o2) sin(3 x + 1) - cos(7 x - 2)
(%i3) with_stdout ("foo.f90",
f90 (x=0.25, y=0.625, 'foo=foo, 'stop, 'end));
(%o3) false
(%i4) printfile ("foo.f90");
x = 0.25
y = 0.625
foo = sin(3*x+1)-cos(7*x-2)
stop
end
(%o4) foo.f90