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# 51. f90

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## 51.1 Functions and Variables for f90

Function: f90 (expr)

  The f90 command is an update to the original maxima fortran command. The primary difference is the way long lines are broken.

  In the next example, notice how the fortran command breaks lines within symbols. The `f90` command never breaks within a symbol.

      (%i1) load("f90")$

      (%i2) expr:expand((xxx+yyy+7)^4);
               4            3         3        2    2
      (%o2) yyy  + 4 xxx yyy  + 28 yyy  + 6 xxx  yyy
                   2          2        3             2
       + 84 xxx yyy  + 294 yyy  + 4 xxx  yyy + 84 xxx  yyy
                                     4         3          2
       + 588 xxx yyy + 1372 yyy + xxx  + 28 xxx  + 294 xxx
       + 1372 xxx + 2401
      (%i3) fortran(expr);
            yyy**4+4*xxx*yyy**3+28*yyy**3+6*xxx**2*yyy**2+84*xxx*yyy**2+294*yy
           1   y**2+4*xxx**3*yyy+84*xxx**2*yyy+588*xxx*yyy+1372*yyy+xxx**4+28*
           2   xxx**3+294*xxx**2+1372*xxx+2401
      (%o3)                       done
      (%i4) f90(expr);
      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)                       done

  The `f90` implementation was done as a quick hack. It is not a necessarily a good example upon which to base other language translations.

  To use this function write first `load("f90")`.

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This document was generated by Robert Dodier on August, 25 2007 using texi2html 1.76.