Sum and average even numbers
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Write a code that can add all the even numbers less than and including 50 and to find their average.
You can use the basic loop commands,colon operators and basic arithmetic operators.
10 个评论
Oleg Komarov
2011-4-14
Go for it dude!!! Bellaaaaaa!!!
Matt Fig
2011-4-14
What have you done so far to solve your problem? Show your work and ask a specific MATLAB question, then you will get help.
NONE NONE
2011-4-15
Sean de Wolski
2011-4-15
I don't know. It sounds more theoretical to me (citation: Matt's answer)
Walter Roberson
2011-4-15
NONE NONE: you did not write a question, you wrote imperative statements, also known as "commands". Imperative statements are similar to, "Take out the garbage", "Cut your hair", and "Give me the answer to my homework question." Questions ask something, and look like, "What is the air-speed velocity of an unladen swallow?", or "Could you help me find documentation on how to add numbers without using a loop?", or "Could I get you another beer?"
Sean de Wolski
2011-4-15
Is that an African or European swallow? And, how many beers have you gotten for the swallow?
Walter Roberson
2011-4-15
Swallows prefer cider.
http://www.aeppeltreow.com/images/Barn%20Swallow%20Cider%20v1%20-%20working.jpg
Matt Tearle
2011-4-15
How could a swallow carry a beer? (Note: it's not a question of where he grips it -- it's a simple question of weight ratios)
Matt Fig
2011-4-15
@Matt,
http://bottlecollecting.blogspot.com/
Walter Roberson
2011-4-15
There is are some serious questions here suitable for implementation in MATLAB. See the following for details of calculations:
http://www.style.org/unladenswallow/
回答（4 个）
Matt Tearle
2011-4-14
3 个投票
Why bother? The answer is -Inf. Your teacher needs to write more precise questions.
4 个评论
Walter Roberson
2011-4-15
Matt, infinity is neither even nor odd, so the most you can do is talk about the _limit_ of the answer rather than the answer itself.
Matt Tearle
2011-4-15
But if you add up all the even negative integers (up to -realmax), in MATLAB you'll get a -Inf result. And because infinity isn't a number, the question itself is, by definition, a limit problem (which will result in -infinity, so MATLAB is right! W00t!)
Walter Roberson
2011-4-16
MATLAB doesn't have any negative integers below -realmax so adding the ones "up to -realmax" is going to get you -realmax .
It is not a priori obvious that one would get -inf rather than nan or some other value when doing the calculation you were probably thinking of, so doing the calculation does become worthwhile.
Matt Tearle
2011-4-18
Hah. I just realized that, in my mind, a:dx:b goes "up to b", even if dx < 0. Stupid semantics.
Paulo Silva
2011-4-14
)05:2:2(mus
2 个评论
Sean de Wolski
2011-4-14
That's a pretty sweet emoticon. A cyclops with a button down suit?
Paulo Silva
2011-4-14
lol that's funny, it does look weird and cool at the same time :)
Jan
2011-4-15
1 个投票
The famous Mr. Gauss could solve these calculations in some seconds without a computer. He imagined a table with the largest and smallest element sided by side, and the 2nd largest and 2nd smallest, etc. How many such pairs can you create? How large is the sum of these two elements? Are you able to ask Wikipedia how to use these information to creatre your answer with "basic arithmetic operators" only?
Sean de Wolski
2011-4-14
0 个投票
Okay, I wrote it. Can I have a beer now?
5 个评论
Oleg Komarov
2011-4-14
I want the pointsssssssssss to increase the distance Sean :)...
Matt Tearle
2011-4-14
Yes, but you probably have to buy it yourself.
Sean de Wolski
2011-4-14
Oleg, you take the points I take the beer?
Sean de Wolski
2011-4-14
Matt, I thought that was one of the conditions of solving a doit4me?
Oleg Komarov
2011-4-14
Doh...
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