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How to use if statements with arrays?

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Dylan Zeigler
Dylan Zeigler 2013-2-12
编辑： David 2020-1-28
I am trying to use an if statement with an array,
x = 1:1:4
if x > 2
y = x + 1
else
y = x - 1
end
I want the resulting array for y to be [ 0, 1, 4, 5], how would i execute specific functions for only certain numbers in an array? i want y = x + 1 to only affect the numbers in the x array that are greater then 2 and y = x - 1 to only affect the numbers in the x array that are less then 2.

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Brian B
Brian B 2013-2-12
y = (x>2).*(x+1) + (x<=2).*(x-1)
  2 个评论
Brian B
Brian B 2013-2-12
编辑：Brian B 2013-2-12
Just watch out if you want to generalize this. The following will not work (i.e., give you a finite numerical result), for example:
a = [0 1 2];
b = [4 3 2];
y = (a~=0).*(b./a); % ... + (a==0)*0 not needed

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