How to fix my function script?

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michael story
michael story 2018-9-26
评论： michael story 2018-9-26
this is edited my script:
function[s,m]=collatz()
%This function will show the steps and maxvalue of even and odd natural
%numbers. It will show the number of steps needed for the number num to
%reach 1. It will show the maxvalue in the list
%Even numbers will be divided by 2
%Odd numbers will be multiplied by 3 and add to by one
%Both will run as long as the result is greater than 1
clc
s=0
m=?
while x>1
if mod(x,2)==0 %shows x(natural number is even)
x=x/2
elseif mod(x,2)==1 %shows x(natural number is odd)
x=x*3+1
end
end
s=s+1;
m=max(?)?
The script above is what I understood from my professor's comments, but I am still lost the m(maxvalue) and what he is saying about my x value. Sorry if the picture is blurry or sideways.

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James Tursa
James Tursa 2018-9-26
编辑：James Tursa 2018-9-26
You need to have the step increment and the max calculation inside your while loop.
m = x; <-- Use this to initialize up front prior to the while loop
s = s + 1; <-- Put this inside your while loop
m = max(m,x); <-- Put this inside your while loop after the "if" block
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James Tursa
James Tursa 2018-9-26
My guess is you pushed the green triangle button in the editor to run this function. That will run the code without defining the input n. You need to call this from the command line like this:
n = 5; % or whatever
[s,m] = collatz(n)
michael story
michael story 2018-9-26
That was the mistake. Thank you!

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