difference between .01 and 0.01 in matlab?

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Rapheal
Rapheal 2012-5-11
Hi!
pls whats the difference between .01 and 0.01 in matlab?
thanks

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回答（4 个）

Richard Brown
Richard Brown 2012-5-11
Readability
John D'Errico
John D'Errico 2012-5-11
Um, zero. As far as MATLAB is concerned, the two are identical. To prove that, I'll do this:
>> hex = sprintf('%bx',0.01)
hex =
3f847ae147ae147b
>> hex = sprintf('%bx',.01)
hex =
3f847ae147ae147b
So the two numbers in hex form are identical. Or look at them using HPF.
DefaultNumberOfDigits 60
hpf(0.01)
ans =
0.0100000000000000002081668171172168513294309377670288085937500
hpf(.01)
ans =
0.0100000000000000002081668171172168513294309377670288085937500
Image Analyst
Image Analyst 2012-5-11
Just a leading zero but essentially they are the same - subtracting them will give a perfect zero (I tried/verified). Perhaps you're thinking of this: http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F
Rapheal
Rapheal 2012-5-12
im confused because i tried it on 2 different computers with different versions of matlab. On the computer that had Matlab 2012 there was an error while in the other computer with matlab 2007 it ran smoothly.
  2 个评论
Image Analyst
Image Analyst 2012-5-12
Tried WHAT on two different computers? What was the error (make sure you copy and paste all the red error text)?
Walter Roberson
Walter Roberson 2012-5-12
What is it that you tried, and what error message resulted?

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