write a function to round off numbers
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Write your own roundn function that takes a floating point value as its input and rounds its nth decimal digit to the nearest number.
>> res = roundn(5.672,3); % results in res = 5.67
>> res = roundn(5.677,3); % results in res = 5.68
>> res = roundn(-5.672,3); % results in res = -5.67
>> res = roundn(-5.677,3); % results in res = -5.68
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Answers (2)
Image Analyst
on 28 Feb 2014
Try multiplying by a factor of 10 then rounding and dividing. That should be a good hint - probably too much of one.
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Image Analyst
on 28 Feb 2014
Instead of checking for every possible factor of 10, why don't you just use 10^myFloat?
And how are you running it, if not from the command line? What value are you passing in when it does not run?
Walter Roberson
on 28 Feb 2014
This cannot be done in MATLAB, not if the values are to be stored numerically as datatype single() or double().
>> fprintf('%.999g\n', 0.1)
0.1000000000000000055511151231257827021181583404541015625
This establishes that even if you had 0.1 already given, that you do not actually get exactly 0.1 stored.
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