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 Significant digits for complex numbers?		  New Topic  Reply to Topic
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verrallr@a

Canada
44 Posts
Posted - 04/08/2005 :  3:46:39 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Version (Select Help-->About Origin): 7.5
Operating System:NT

It seems we cannot double-precision complex numbers. We can only get 7 signicant figures for each of the real and imaginary part. Is that correct?

Richard.

easwar

USA
1965 Posts
Posted - 04/08/2005 :  4:38:37 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Richard,

We tested and it works fine:


#define		CC_REAL_PART			0.9876543210987e300
#define		CC_IMAGINARY_PART		0.1234567890123e-280

void	test_complex()
{
	complex		cc;
	
	cc.m_re = CC_REAL_PART;
	
	cc.m_im = CC_IMAGINARY_PART;
	
	printf("real part = %17.13e\nimag. part = %17.13e\n", cc.m_re, cc.m_im);
	
	ASSERT(cc.m_re == CC_REAL_PART);
	ASSERT(cc.m_im == CC_IMAGINARY_PART);
	
	return;
}



Easwar
OriginLab



Edited by - easwar on 04/08/2005 5:00:06 PM
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verrallr@a

Canada
44 Posts
Posted - 04/08/2005 :  11:36:49 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
OK, thanks Easwar.
In my code, when running Debug and watching Local Variables, it only appears as 7 digits. But, maybe thats just for space. I also used a small program in Origin's help, and it seemed to show only 7 digits. But, your example is conclusive.

Thanks much,
Richard.
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