How to stop from rounding off the decimal numbers?

Hi,

if yupperleft(j)== piinterval(i) upperleft(i)= x1(j);

In the above code, yupperleft is the array which i have calculated by some formulation. piinterval is the array generated from : piinterval=(0:0.1:1);

Matlab is storing the value at 31 index of yupperleft as 0.1000. piinterval(2) will also be 0.1000.

But when comparing they are not getting equal. The reason is because yupperleft is actually 0.0999999999999999.

Is there any way so that i can round off or do something so that 0.0999999999999999 gets to 0.1000 actually not just for to show.

Thanks

Answer 1

[Image Analyst]

Use tolerances to compare floating point numbers. See the FAQ for code samples and an explanation: http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F

Answer 2

[Stephen23]

The simplest method is to allow for some tolerance in the comparison:

A = 0.1;
B = 0.09999999;

Instead of

A==B

you should use

abs(A-B) < 1e-6 % pick this value to suit your needs

Answer 3

[Virtualkeeda]

Thank you so much @Image Analyst and @Stephen Cobeldick . The tolerance method worked.

Thank you @Star Strider yours roundn method is also working.