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Default value: 65
f90_output_line_length_max
is the maximum number of characters of Fortran code
which are output by f90
per line.
Longer lines of code are divided, and printed with an ampersand &
at the end of an output line
and an ampersand at the beginning of the following line.
f90_output_line_length_max
must be a positive integer.
Example:
(%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_output_line_length_max;
(%o3) 65
(%i4) 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
(%o4) false
(%i5) f90_output_line_length_max : 40 $
(%i6) f90 ('foo = foo);
foo = yyy**4+4*xxx*yyy**3+28*yyy**3+6*xx&
&x**2*yyy**2+84*xxx*yyy**2+294*yyy**2+4*x&
&xx**3*yyy+84*xxx**2*yyy+588*xxx*yyy+1372&
&*yyy+xxx**4+28*xxx**3+294*xxx**2+1372*xx&
&x+2401
(%o6) false
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;
the number of output characters per line, not including ampersands,
is specified by f90_output_line_length_max
.
f90
outputs an ampersand at the end of a split line
and another at the beginning of the next line.
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
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