MATLAB: Integer check

integer

How can i do an integer check in matlab? Say i have a number, a = 1.5, how do i check if it is integer or not? i want to use an if statement:

if non_integer(a) == true

end

so i need to know what to use for "non_integer", which would return a true or false

Best Answer

floor(x)==x

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MATLAB: Does MATLAB support quadruple precision – 128-bit floating point arithmetics

The floating point arithmetic format that occupies 128 bits of storage is known as binary128 or quadruple precision.

The following blog post by MathWorks' Chief Mathematician Cleve Moler describes an implementation of quadruple precision programmed entirely in the MATLAB language:

https://blogs.mathworks.com/cleve/2017/05/22/quadruple-precision-128-bit-floating-point-arithmetic/

Please note that quadruple precision is not available as of MATLAB R2018b. As a workaround, it is possible to obtain more precision using Variable Precision Arithmetic from the Symbolic Math Toolbox. Another possibility is to use the Fixed-Point Toolbox to obtain more precision. Note that in either case, the numbers will not be of the floating point format.

MATLAB: About isinteger command(confusion)

Matlab represents integers in differnt ways:

int8, int16, etc. see Christians answer
with a special use of double, which is called flint. See Floating Points

I use this function to test for flint

    function    isf = isflint( m )
    %   floating double only
        try
            bitand( abs( m ), 1 );
            isf = true;
        catch me
            isf = false;
        end
    end

I picked up the idea from a contribution by the "Pedestrian" in the FEX.

(I stripped off comments and error handling.)

Best Answer

Related Solutions

MATLAB: Does MATLAB support quadruple precision – 128-bit floating point arithmetics

MATLAB: About isinteger command(confusion)

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