error when calculating factorial

2014 8 12
2 个回答
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更新时间：2014 8 12
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I want to calculate all the combinations for a X number of variables and I am doing this code:
m=6;%number of variables
TC=0;
for n=1:m,
C=factorial(m)/((factorial(n)*factorial(m-n));
TC=TC+C; %total number of combinations
end
TC
but I have the following error message from MATLAB:
Unbalanced or unexpected parenthesis or bracket.
Does anybody know which would be the right code to compute the total number of combinations, or where is the error in my code?

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 采纳的回答

Christoph
Christoph 2014-8-12

1 个投票

C=factorial(m)/((factorial(n)*factorial(m-n));
You are opening two parentheses, but closing only one in the denominator

更多回答（1 个）

Ben11
Ben11 2014-8-12

1 个投票

The error is due to a missing bracket at the end of this line:
C=factorial(m)/((factorial(n)*factorial(m-n));
Add a bracket and it works.
C=factorial(m)/((factorial(n)*factorial(m-n)));

13 个评论
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Josep
Josep 2014-8-12
okay, I see the missing bracket but there is still an error..
Error in factorial (line 4)
C=factorial(m)/((factorial(n)*factorial(m-n)));
any idea?
Ben11
Ben11 2014-8-12
what is the error message? I used your code with the added bracket and it worked.
Josep
Josep 2014-8-12
>> factorial Attempt to execute SCRIPT factorial as a function: C:\Users\p105312\Desktop\factorial.m
Error in factorial (line 4) C=factorial(m)/((factorial(n)*factorial(m-n)));
Ben11
Ben11 2014-8-12
ok is "factorial" the name of your script? If so change it for something else like Factorial_function for instance, otherwise Matlab might confuse it with the built-in function "factorial".
Josep
Josep 2014-8-12
编辑：Josep 2014-8-12
so what you mean is that I have to save the file as a different name than factorial? Because I have already saved the file as fact.m and it still doesn't work.
Ben11
Ben11 2014-8-12
yes, because there is already a built-in function named factorial.
Josep
Josep 2014-8-12
I don't know what I should do to make it works. Sorry for my lack of comprehension but I am new on Matlab.
Ben11
Ben11 2014-8-12
No problem! You can simply save your m.file under a different name using the "save as" button.
Josep
Josep 2014-8-12
编辑：Josep 2014-8-12
Okay! the problem has been that I had to delete the file called factorial in my desktop, now it works perfectly!
Thank you very much Bill, you have been very kind and useful!
Ben11
Ben11 2014-8-12
can you post your whole .m file?
Ben11
Ben11 2014-8-12
yep. That's weird that it does not work if this is what you have in your m.file. Maybe restart matlab and run it again? Copying this code in your command window generates this error?
Josep
Josep 2014-8-12
that works now, everything okay! Thank you ;)

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