small floating point has been considred as zero value!

hi,

x=0.16
if x>0.1 
    d=1
else 
    d=0
end

the answer is 0

I do not know where is the problem?

[Les Beckham]

I don't see a problem. Are you sure this is really the code that you are having the problem with?

x = 0.16

x = 0.1600

if x > 0.1 
    d = 1
else 
    d = 0
end

d = 1

Answer 1

[Steven Lord]

More likely than not, your value for x is not what you think it is. If we run your code on Answers:

x=0.16

x = 0.1600

if x>0.1 
    d=1
else 
    d=0
end

d = 1

Now if your number was part of a larger array with numbers of varying magnitudes, part of the display may look like 0.16 without it actually being 0.16:

x = [1e-6 0.16e-3]

x = 1x2

1.0e-03 * 0.0010 0.1600

Note that x(2) displays as 0.16 but there's that "1.0e-03 *" right below the name of the variable. So it's actually much smaller; basically one one-thousandth of 0.16:

y = x(2)

y = 1.6000e-04

1000*y-0.16

ans = 0

and that is not greater than 0.1 (aka 1.0000e-01)

format shorte
z = 0.1

z = 
   1.0000e-01

So when we use y in place of 0.16, MATLAB correctly identifies that y is not greater than 0.1:

if y > 0.1
    d = 1
else
    d = 0
end

d = 
     0

Answer 2

[Star Strider]

Your code works correctly when I run it here —

x=0.16

x = 0.1600

if x>0.1 
    d=1
else 
    d=0
end

d = 1

d

d = 1

.