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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.

James Tursa
on 17 Sep 2020

Edited: James Tursa
on 17 Sep 2020

Asad (Mehrzad) Khoddam
on 17 Sep 2020

function f = Factorial(n)

%

%

if n = 0 || n = 1

f = 1;

elseif n >= 1

f = n * Factorial(n-1);

end

Rik
on 17 Sep 2020

Why did you post this answer? Direct answers without an explanation encourages cheating.

If you don't respond I will delete this answer.

William
on 17 Sep 2020

function f = Factorial(n)

%

if n = 0 || n = 1

f = 1;

elseif n >= 1

a = 1:n;

f = prod(a);

end

Asad (Mehrzad) Khoddam
on 17 Sep 2020

I didn't seem to be an assignment. Also, some parts were ready and correct.

I have seen some answers from you with similar conditions:

Rik
on 17 Sep 2020

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
on 17 Sep 2020

Asad (Mehrzad) Khoddam
on 17 Sep 2020

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

Stephen Cobeldick
on 17 Sep 2020

The if statement is superfluous: that for loop will only iterate for n>=2 anyway.

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