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Creating a function to output factorials.

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MILLER BIGGELAAR
MILLER BIGGELAAR el 16 de Abr. de 2020
Comentada: MILLER BIGGELAAR el 16 de Abr. de 2020
Hi I am trying to create a user defined function that will allow me to enter an integer and it will output the given factorial.
function [y] = fact(x)
clc
y=1;
for i=1:x
y=y*i;
end
disp(y)
This is it and it is working but I also need it to display an error message if it is a negative integer or non integer (e.g 8.5) and for it to also display 1 for factorial 0.
I have tried adding if statements in the loop for if x<0 etc. but I am getting the same answer which is just 1.
It works for positive integers just not the others.
Any thoughts?

Respuesta aceptada

Walter Roberson
Walter Roberson el 16 de Abr. de 2020
if ~isnumeric(x) || ~isscalar(x) || x ~= fix(x) %x == fix(x) checks for integer
error('Oh, oh, oh, oh, oh!')
end
  3 comentarios
Walter Roberson
Walter Roberson el 16 de Abr. de 2020
Works for me:
if ~isnumeric(x) || ~isscalar(x) || x ~= fix(x) || x<0 %x == fix(x) checks for integer
error('Oh, oh, oh, oh, oh!')
end
MILLER BIGGELAAR
MILLER BIGGELAAR el 16 de Abr. de 2020
I got it to work, I put the if statement after the factorial when I needed to put it before.
Much appreciated.

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