MATLAB: Round value ??

MATLABnumber

Dear all,

I have to round a number to a specified number of decimal points.Anybody can help me??

Thank you

Best Answer

There are a number of submissions on the FEX:

http://www.mathworks.com/matlabcentral/fileexchange/?term=round

Two that look promising are:

http://www.mathworks.com/matlabcentral/fileexchange/4261-round2

and

http://www.mathworks.com/matlabcentral/fileexchange/26212-round-with-significant-digits

Related Solutions

MATLAB: How to round up all components of a matrix to nearest ‘k’ decimal

vpa(d,3)

We can tell from the number of decimal places that you show that you must be using symbolic numbers, so you can use vpa() to evaluate to a specific number of decimal places.

There is no way to round double precision numbers to a particular number of decimal places, because 0.1 is not exactly representable as a finite binary floating point number, for the same reasons that 1/7 is not exactly representable as a finite decimal number.

MATLAB: How to get floating point number upto 4 decimal points

vpa(sym(x), 4)

will give you 4 digit symbolic numbers.

arrayfun(@(X)  sprintf('%.4f',X), x, 'uniform', 0)

cellstr(num2str(x(:), '%.4f')).'

will give you a cell array of strings representation.

round(x*10000)

will give you integers with an implied decimal point.

But if you are looking for floating point values with exactly 4 decimal places then the symbolic version is as close as you can get. The fraction 1/10 requires an infinite repeating value in binary, just like 1/7 requires an infinite repeating value in decimal. You just cannot represent 0.8462 exactly in binary.

Best Answer

Related Solutions

MATLAB: How to round up all components of a matrix to nearest ‘k’ decimal

MATLAB: How to get floating point number upto 4 decimal points

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