Erlang dynamic variable names on each iteration -


program working now. simplest solution best. registered processes did not work. having trouble call await/2 base case of start/6. turned out using modified list t_t.

%variables t = 10000000,        p = 4,               tpart = 2500000,             width = 1.0 / t, pi = pi(t, p, [], 1), calls pi/4 , gets list of pid  start(t, p, tpart, width, pi, 1). %calls start pi variable should contain 4 pids        % create list of p pids , return pi(_, p, list, count) when count > p -> list; pi(t, p, list, count) -> pid = spawn(pi, child, []), count2 = count + 1, pi(t,p, [pid|list], count2).   %start iterates through list of pids , sends work order each process start(_, p, _, _, _, staticlist, count) when count > p -> await(staticlist, 0.0); start(t, p, tpart, width, [head|tail], staticlist, count) ->       head ! {work, self(), p, count, tpart, width},    count2 = count + 1,    start(t,p,tpart,width,tail, staticlist, count2).   %  collects partial sums child processes. print final output await([], final) -> io:format(" final sum: ~.8f \n", [(final * 4.0)]); await([pid | rest], final) ->     receive         {done, pid, sum} ->         partial = final + sum,         await(rest, partial)     end.

you cannot name pids directly. can take process name, however, , register using register/2. should careful, though, because registered process name needs atom , potentially fill atom table if aren't careful. 

%call function pi = pi(t,p, [], 1, getname(1)), %list of pids  % main function should return list of pid's different names.  pi(t, p, list, count) when count >= p -> list; pi(t, p, list, count) -> pid = spawn(pi, child, []), % want have name be: pidx = ... count2 = count + 1, name = getname(count2), register(name,pid), pi(t,p, [name|list], count2).   %helper method returns atom. want use variable name in main function. getname(count) -> x = "pid", y = integer_to_list(count), name = x ++ y, list_to_atom(name).

if need list of pids, why name them @ all? this:

%call function pi = pi(t,p, [], 1, getname(1)), %list of pids  % main function should return list of pid's different names.  pi(t, p, list, count) when count >= p -> list; pi(t, p, list, count) -> pid = spawn(pi, child, []), % want have name be: pidx = ... count2 = count + 1, pi(t,p, [pid|list], count2).

this return list of pids without need of other helper function.


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