MATLAB error in counting

2012 4 18
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How is it possible that my calculator comes out a different result than matlab calculated?
>> suma2= 7874;
voxsuma2=suma2*2*0.9766;
str = ['označena plocha je 2', num2str(voxsuma2), ' mm^2.']
str =
označena plocha je 215379.4968 mm^2.
a calculator:7874*2=15748
15748*0.9766=15379,4968
15379,4968 or 215379.4968 is correct? WTH??

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Adam
Adam 2012-4-18
good, as I do that the result was the same as on a calculator?

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Friedrich
Friedrich 2012-4-18

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Hi
num2str is correct here, but the missing space after the 2 makes the result looking wrong, because the correct number 15379.4968 appears right after the 2. Try
suma2= 7874;
voxsuma2=suma2*2*0.9766;
str = ['označena plocha je 2 ', num2str(voxsuma2), ' mm^2.']
(Note the extra space after "je 2" before the num2str)

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Adam
Adam 2012-4-18
str = ['označena plocha je 2 ', num2str(voxsuma2), ' mm^2.']
do not understand why but when I removed the "2" so it goes well
str = ['označena plocha je',num2str(voxsuma2),'mm^2.'];
thank you much for the quick help and advice
Friedrich
Friedrich 2012-4-18
Its a formatting thing, the num2str works correct. take the number you see on the screen 215379.4968 and ignore the 2 in front of it and you will get 15379.4968. The 2 you see is the 2 you print before it with the text string "je 2". Its like a typo. The 2 doenst belong to the value which num2str gives but it looks like it does.

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