error in eval function
in [Matlab]
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From: Nilanjan Roy on 22 Feb 2010 05:50 so i am giving the following commands and am facing an error in eval function :- >> syms p q m n k >> n =24 >> m = 25 A = symsum ( ((sym('(n-1)!')/(sym('(n-k-1)!') * (sym('k!'))))* (sym('m!')/(sym('(m-k)!')*(sym('k!')))) *(p^k)* ((1 - p)^(n-k-1)) * (q^k)* ((1 - q)^(m - k))), k, 0, n-1) matlab gives eval(A) values in terms of p and q for n = 13; m = 14. But when i use a little higher values like the ones above(25, 24) , I get the following error :- >> eval(A) ??? Error: Unexpected MATLAB operator. Error in ==> sym.eval at 15 s = evalin('caller',vectorize(map2mat(char(x)))); Could anyone suggest any way of avoiding the error and to get the desired eval(A) ?? Thanks a lot.
From: Nilanjan Roy on 22 Feb 2010 10:25 Okk so this is me again..... Although I do not have the reason why this is not working I can make things work when I break the symbolic sum expression into 2 parts :- one from k = 0 to something say (n-10) and then (n-9) to (n-1). I guess the magnitude of the problem is large and thats why the error. Hence consider this post as closed now. Thanks. "Nilanjan Roy" <royn2010(a)gmail.com> wrote in message <hltngu$9js$1(a)fred.mathworks.com>... > so i am giving the following commands and am facing an error in eval function :- > > >> syms p q m n k > >> n =24 > >> m = 25 > > A = symsum ( ((sym('(n-1)!')/(sym('(n-k-1)!') * (sym('k!'))))* (sym('m!')/(sym('(m-k)!')*(sym('k!')))) *(p^k)* ((1 - p)^(n-k-1)) * (q^k)* ((1 - q)^(m - k))), k, 0, n-1) > > matlab gives eval(A) values in terms of p and q for n = 13; m = 14. But when i use a little higher values like the ones above(25, 24) , I get the following error :- > > >> eval(A) > ??? Error: Unexpected MATLAB operator. > > Error in ==> sym.eval at 15 > s = evalin('caller',vectorize(map2mat(char(x)))); > > > Could anyone suggest any way of avoiding the error and to get the desired eval(A) ?? > > > Thanks a lot.
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