Why is MATLAB rounding this?
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I have a part of my code:
eps = 10^(log10(eps) + 0.125);
The program will round it off. For instance, if the original value of eps is 2, the calculated value is 133. This is rounded. If I do the same code in the command window, it gives me the correct value, which is a decimal.
If I run the code:
eps = 10^(log10(eps) - 0.125);
and the original value of eps is 0, it returns 0, and the while loop I have it in blows up.
I would like to stop it from rounding. These take place in a nested if statement, within a while loop.
4 Comments
Bruno Luong
on 13 Feb 2011
Please write what do you expect and you get with a concrete value for eps (and btw change the name eps to something else as Oleg suggested).
Answers (3)
Bruno Luong
on 13 Feb 2011
a = 2
fprintf('%1.16e', 10^(log10(a) + 0.125))
2.6670428643266479e+000
What's your problem???
4 Comments
Oleg Komarov
on 14 Feb 2011
It doesn't give me any problem. What you do before that in your code? Do you have a variable log10 defined, or a self-written log10 fcn?
Jan
on 14 Feb 2011
If you use INT2STR to display the result, the printed number is rounded - read the help text of INT2STR! Use NUM2STR or SPRINTF instead to get the decimals.
Try Bruno's example and post, if it runs as wanted.
0 Comments
Walter Roberson
on 14 Feb 2011
Double-check to see which "format" you have in effect. And if you are using a variable for the "100" part, check the data class of the variable: if it happened to be one of the integer types then the answer would be integer.
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