MATLAB: How to display a complex decimal result with actual precision value

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I am trying to do arithmetic calculation with a number e=0.015923-0.03179523i iteratively to generate an encryption key which is to be expected a high precision complex decimal number. After calculation, I got the result only upto 4 decimal digits. I tried digits() but problem is that the result displayed according to the number given in digits(). I want the result with actual precision value. Please help.

Best Answer

The default display format, format short, displays numbers "Short, fixed-decimal format with 4 digits after the decimal point." But note that this has no impact on how the numbers are stored and computed, which is to double precision. Change your display format if you want to see more decimal places.

If you want to compute your complex number using higher precision than double precision, use Symbolic Math Toolbox.

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MATLAB: How to set MATLAB to read an input with more than 15 decimal places

IEEE 754 Double Precision is limited to 53 bits precision, which comes out between 15 and 16 decimal places. You cannot use ordinary MATLAB Double Precision to compute 17 decimal places. You would need to use a high precision library of some kind.

The MATLAB Symbolic Toolbox can handle more than 16 digits.

MATLAB: How to avoid the loss of the last digit (it gives a zero instead of a one)

num2str(uint64(14472334024676221),'%u')

You have exceeded flintmax:

flintmax Largest consecutive integer in floating point format.
  flintmax returns the largest consecutive integer in IEEE double
  precision, which is 2^53. Above this value, double precision format
  does not have integer precision, and not all integers can be represented 
  exactly.

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MATLAB: How to set MATLAB to read an input with more than 15 decimal places

MATLAB: How to avoid the loss of the last digit (it gives a zero instead of a one)

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