Factorial without the Command
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I am struggling to figure out how to compute a factorial without the use of the command. My task is to input a nonnegative integer and have the program compute its factorial.
Here is what I have for my script so far.
function Factorial = ex1(n)
%
%
if n = 0
Factorial = 1;
elseif n >= 1
Factorial = n(n-1)(n-2)(n-3)(3)(2)(1);
end
This program does not run, however I do not know where to go from here.
0 件のコメント
回答 (4 件)
James Tursa
2020 年 9 月 17 日
編集済み: James Tursa
2020 年 9 月 17 日
You could use either use a loop to multiply all of the numbers from 1 to n, or use recursion to multiply n by the factorial of n-1 (with some method of stopping the recursion). Were you instructed to use one of these methods? You could also use some different MATLAB functions for this, but I am not sure which ones would be allowed for your homework.
Asad (Mehrzad) Khoddam
2020 年 9 月 17 日
function f = Factorial(n)
%
%
if n = 0 || n = 1
f = 1;
elseif n >= 1
f = n * Factorial(n-1);
end
1 件のコメント
William
2020 年 9 月 17 日
function f = Factorial(n)
%
if n = 0 || n = 1
f = 1;
elseif n >= 1
a = 1:n;
f = prod(a);
end
4 件のコメント
Rik
2020 年 9 月 17 日
A comment posted after you posted your answer confirmed my suspicion. If you thought this wasn't a homework assignment, why didn't you post the best solution: using the built-in factorial function.
The link you posted did not look like homework to me, although I see how it might be. That user also showed willingness to put in their own effort, and they posted that a hint would also suffice. If that one is a homework question, it is a complex one, and getting help here is a valid strategy.
I would question the usefulness of posting several answers on what is obviously a homework question, if only because the OP has posted a statement to that effect.
I have the option to delete answers, but I chose to not use it if there is at least the suggestion that reasonable people might disagree. If you actually think it isn't a homework question, then you should at least try to answer the question such that you use optimal code.
PS I'll probably move your comment and this one to your answer, because that is what we are discussing.
Asad (Mehrzad) Khoddam
2020 年 9 月 17 日
From the initial code, I thoughed that he wants to use a recursive function. So I modified the second part of the code. Later after seeing your comment and the code of the others, I noticed that he wants to use basic operations. That's all I did and thank you for your comment about being more carefull.
Asad (Mehrzad) Khoddam
2020 年 9 月 17 日
Using only basic operations:
function f = Factorial(n)
%
% initial value, 0! and 1!
f = 1;
if n > 1
for i=2:n
f = f * i;
end
end
1 件のコメント
Stephen23
2020 年 9 月 17 日
The if statement is superfluous: that for loop will only iterate for n>=2 anyway.
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