Comparing two numbers by using IF in Matlab
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I want to compare two numbers (x, and y), if they are equal or not.
However, even if these two numbers are equal, if condition in Matlab does not recognize them as equal numbers.
How I can make if statement recognize these two numbers if they are equal?
x=10.^(0.1.*4);
y=2.5119;
if x == y
z=1
'equal'
else
z=2
'Not Equal'
end
采纳的回答
Iain
2014-10-15
The code is correct.
The problem is that x - y is not precisely 0. The magnitude of the difference will be less than 1e-5
You have two options, define y to the 16th significant figure, or allow a tolerance like this:
if abs(x-y) < tolerance
更多回答（2 个）
Stephen Carter
2014-10-15
They are not equal:
>> format long
>> x
x =
2.511886431509580
>> y
y =
2.511900000000000
Image Analyst
2014-10-15
0 个投票
See the FAQ for an explanation and some code to make it do what you want: http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F
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