MATLAB double addition format long
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vivek patel
il 3 Nov 2022
Modificato: Stephen23
il 3 Nov 2022
Why does the below addition show wrong output when i use the format long option ?
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1179628/image.png)
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Stephen23
il 3 Nov 2022
Modificato: Stephen23
il 3 Nov 2022
"Why does the below addition show wrong output when i use the format long option ?"
Why do you think that it is a "wrong output" ?
Can you show us any double floating point number that is closer to the value 14.2?
format hex
14.2
format long
14.2
N = hex2num({'402c666666666665','402c666666666666','402c666666666667'})
fprintf('%.50f\n',N)
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VBBV
il 3 Nov 2022
format long
x = 14.1 %
x = 0.1
x = 14.1 + 0.1 % when you include + operator
When a mathematical operator /computation is used between any two numbers, Matlab uses its floating point arithmetic precision to compute precisely, Notice the difference in outputs when individual numbers are present without operators !
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