recursion - Recursive Combination on Fortran -


i wrote recursive program on fortran calculate combinations of npoints of ndim dimensions follows. first wrote program on matlab , running. in fortran, problem after first iteration assigning absurd values list of points, no explanation. give me hand?

program main    implicit none     integer :: ndim, k, npontos, contador,i,iterate, test    integer, dimension(:), allocatable :: pontos     print*, ' '    print*, 'npoints?'    read *, npontos    print*, 'ndim?'    read *, ndim    k=1    contador = 1    open(450,file= 'combination.out',form='formatted',status='unknown')    write(450,100) 'comb  ','stat  ',(' pt ',i,' ',i=1,ndim)    write(450,120) ('xxxxxxxxxx ',i=1,ndim+1)    allocate(pontos(ndim))     i=1,4    pontos(i)=i    end      test = iterate(pontos, ndim, npontos,k,contador)          end program main           recursive integer function iterate(pontos, ndim, npontos, k,contador)            implicit none            integer, intent(in) :: ndim, k, npontos            integer,dimension(:) :: pontos            integer contador,inic,i,j,m               if (k.eq.ndim)                  inic=pontos(ndim)                  = pontos(ndim),npontos                     pontos(k)=                     write(*,*) pontos(:)                       contador=contador+1                  end                  pontos(ndim)= inic + 1                              else                  inic = pontos (k)                  j = pontos(k),(npontos-ndim+k)                      pontos(k)=j                      pontos= iterate(pontos, ndim, npontos, k+1,contador)                 end             end if               pontos(k)=inic+1;            if (pontos(k).gt.(npontos-ndim+k+1))                 m =k+1,ndim                     pontos(m)=pontos(m-1)+1                 end             end if                         end function iterate

there many issues in code... stopped debugging it. got far, it's comment.

this doesn't make sense: 

pontos= iterate(pontos, ndim, npontos, k+1,contador)

you changing pontos inside iterate, , never set return value within function.

you need a) provide result statement recursive functions (and set it) or b) convert subroutine. since modifying @ least 1 dummy argument, should go b).

since using assumed-shape dummy arguments, need specify interface function/subroutine, either explicitly or module.

neither format 100 nor format 120 specified in code.


Comments

Post a Comment

Popular posts from this blog

c++ - Difference between pre and post decrement in recursive function argument -

i have following sample code used pre-decrement void function(int c) { if(c == 0) { return; } else { cout << "dp" << c << endl; function(--c); cout << c << endl; return; } } this function give output input 4 : dp3 dp2 dp1 dp0 0 1 2 3 but when use post decrement void function(int c) { if(c == 0) { return; } else { cout << "dp" << c << endl; function(c--); cout << c << endl; return; } } output goes in infinite loop dp4 can explain me in detail why happens ? this happens because function(c--) called same value of c , when finishes c decremented. recursively called, hence called same value no chance of return , hit stack overflow error. assume this, int x = 1, y = 0; y = x++ result y == 1 , x == 2. if y = ++x , bot x , y 2.
Read more

php - Nothing but 'run(); ' when browsing to my local project, how do I fix this? -

i added new project. made mistake in projectname.conf file in sites-available apache2, led me reinstalling apache2. after reinstalling , re-enabling projects on every page of every project .. <body> run(); </body> .. i've run composer update, restarted service, restarted pc, checked config files, tried disabling new project. there nothing in error log, , access.log: 127.0.0.1 - - [15/may/2015:01:40:47 +0200] "get / http/1.1" 304 181 "-" "mozilla/5.0 (x11; ubuntu; linux x86_64; rv:38.0) gecko/20100101 firefox/38.0" maybe i'm forgetting apache2 reinstall? don't think did different last time installed it. looks haven't setup php correctly. take @ this great guide , maybe you're forgetting link php config apache2.
Read more

php - How can I echo out this array? -

i don't know how go grabbing data in variable , put foreach loop. class tree{ private $info = array( array('name'=>'jim','state'=>'nu','company'=>'nu','phone'=>array('cell'=>'5615111111','office'=>'5611111111'),'email'=>array('primary'=>'exs@example.com','ex@there.com')), array('name'=>'joe smith','city'=>'phoenix','phone'=>'4805551111','email'=>'jsmith@some_email.com'), array('name'=>'john doe','city'=>'chandler','company'=>'doe co.','email'=>array('jdoe@gmail.com','personal'=>'email@email.com'),'phone'=>'6025550002') ); } if you're inside of class, can access private variable using $this->variablename . example, i...
Read more