Creating a Factorial for an Input/Output Array using Loops

I was tasked a homework problem to take a user-inputted array and output the resulting factorial of each array element in a new array. We're only allowed to use the following built-in functions: length, size, round, abs, fprintf, plot. (In my code below I'm using disp as a easy way to quickly see the output, I'll be changing it to fprintf later.)

I don't have issues creating a factorial loop for a single number, but I'm unsure how to take an array, "factorialize" it, and output it in another array. Here's my code thus far:

Array = input('Enter an array of positive integers in brackets: ');
N = length(Array);

for k = 1:N
    if Array(k)<0 || (round(Array(k)) ~= Array(k))
        error('Array can''t have negative or fractional numbers.\nArray A(%g) = %g', k, Array(k));
    else
        f(1) = [Array(k)*k];
        k = k+1;
    end
end

disp([f]);

The portion for checking the if statement works correctly, it prints the error whenever a fraction or negative number is input.

My problem is actually "factorializing" the array under the else statement. I've tried a few different combos of placeholders to create the output array, but I can't seem to figure out the right way to do it for it to result in actually printing an array and not a single integer.

Thanks in advance for the help!

[darova]

What about external for loop?

Answer 1

[Voss]

% Array = input('Enter an array of positive integers in brackets: ');
Array = [4 7 2 0 3 1]; % can't take input here, so suppose they entered this Array
N = length(Array);

for k = 1:N
    if Array(k)<0 || (round(Array(k)) ~= Array(k))
        error('Array can''t have negative or fractional numbers.\nArray A(%g) = %g', k, Array(k));
    else
        f(k) = 1;
        for m = 1:Array(k)
            f(k) = m*f(k);
        end
    end
end

disp([f]);

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