[Octave-bug-tracker] [bug #42071] complex trig functions differ from Matlab

[Michael Godfrey]

Follow-up Comment #6, bug #42071 (project octave):

As usual in these matters, best to start at the beginning.

The short answer is simple:
octave:3> i*20*pi
ans = 0000000000000000  404f6a7a2955385ei
octave:4> format long
octave:5> ans
ans =   0.000000000000000 + 62.831853071795862i
octave:6> exp(i*20*pi)
ans =  1.00000000000000e+00 - 2.44929359829471e-15i
octave:7> 

MATLAB Version 7.9.0.529 (R2009b)
>> i*20*pi   

ans =

   0000000000000000   404f6a7a2955385ei

>> format long
>> ans

ans =

                  0 +62.831853071795862i

>> exp(i*20*pi)

ans =

  1.000000000000000 - 0.000000000000002i

>> 
So, it is time to fix the format conversion for
type complex.  Any volunteers?

A longer version of the above is attached. No really
important information, just some history.

And, this report should be relabelled as

format conversion of imaginary part of type complex.

Michael


(file #31143)
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Additional Item Attachment:

File name: format_conv                    Size:1 KB


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