How do I make an if, elseif, else statement?

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zizo
zizo 2011-6-14
if 0<x<10
y=4*x
elseif 10<x<40
y = 10*x
else
y = 500
end
I would expect test cases of
x= -1
x= 5
x= 30
x=100
  2 个评论
Jan
Jan 2011-6-14
Think of the case of x==10, e.g. by "10<=x & x < 40".
Walter Roberson
Walter Roberson 2011-6-14
Good point, Jan.
zizo, Jan's point here is one that I pointed out to you before, when you asked a question a month ago, http://www.mathworks.com/matlabcentral/answers/7479-just-q

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采纳的回答

Paulo Silva
Paulo Silva 2011-6-14
The correct way to do the conditions is this:
if 0<x & x<10
y=4*x
elseif 10<x & x<40
y=10*x
else
y=500
end

更多回答（1 个）

Sean de Wolski
Sean de Wolski 2011-6-14
Or the vectorized solution:
y = repmat(500,size(x));
idx = 0<x&x<10;
y(idx) = 4*x(idx);
idx = 10<x&x<40;
y(idx) = 10*x(idx);
  3 个评论
显示 1更早的评论
Matt Fig
Matt Fig 2011-6-14
@Paulo, perhaps this is better?
and(0<x,x<10)
Sean de Wolski
Sean de Wolski 2011-6-14
Is it just the order of operations that worries you?
BTW. I'm not even sure my approach would be faster than with the accelerated for-loops.

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