How can i use the ceil function rightly?

i notice that the ceil function does not work right on some value and i do not know why

for example:i used ceil(2.7/0.3) and it results 10 but the right result must be 9

However,when i tried another value,e.g ceil(2.4/0.3),it results 8 which is right

this function also work wrong on some another values,like ceil(2.1/0.3),ceil (4.2/0.3)

Thank you

Answer 1

[Walter Roberson]

>> 2.7/0.3 - 9

ans =

1.77635683940025e-15

so ceil() is correct.

As to why 2.7/0.3 is not exactly 9, see http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F

[Chau Phong]

Thank you so much,i get it now