MATLAB: Double precision becomes complex double after calculation

complex doubledouble precision

The outputs for c1(p) becomes complex double after calculation. However, it should be double precision since I am just raising the power of the element. Is there any possibility to fix it? I calculated manually and all the outputs should be double precision.

Best Answer

-1 is real. 0.5 is real. (-1)^(0.5) is complex. There's nothing to "fix" as that's the expected behavior.

If you want MATLAB to throw an error when you raise a real number to a real power and would receive a complex result, use the realpow function.

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MATLAB: Double precision

I didn't know double precision was broken. You can get higher precision with the Symbolic Toolbox. Or if you only need integers, with the FEX submission vpi by John D'Errico:

http://www.mathworks.com/matlabcentral/fileexchange/22725-variable-precision-integer-arithmetic

MATLAB: Matlab integer format for answer

Try a function, like int32(), fix(), ceil(), floor(), uint8(), int32(round()), etc.

a = (2+24)/(4*3) % Floating point.
aInteger = int32(a)
whos aInteger; % int32
aInteger = round(a)
whos aInteger; % Double


aInteger = floor(a)
whos aInteger; % Double
aInteger = ceil(a)
whos aInteger; % Double
aInteger = fix(a)
whos aInteger; % double
aInteger = uint16(a)
whos aInteger; % uint16

Note that with round(), ceil(), floor(), and fix() you will end up with a double but with no fractional part. If you want an actual integer, you have to cast to an integer data type with int32(), int16(), etc.

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MATLAB: Double precision

MATLAB: Matlab integer format for answer

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