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

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

[Jan]

Think of the case of x==10, e.g. by "10<=x & x < 40".

[Walter Roberson]

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

Answer 1

[Paulo Silva]

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

Answer 2

[Sean de Wolski]

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);

[Paulo Silva]

good one :) also one thing that I never do is 0<x&x<10 , was afraid it might result on error but guess not.

[Matt Fig]

@Paulo, perhaps this is better?

and(0<x,x<10)

[Sean de Wolski]

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.