Getting 'N/D' to eval as a fraction not a decimal
03-07-2015, 01:48 AM (This post was last modified: 03-07-2015 02:02 AM by Joe Horn.)
Post: #4
 Joe Horn Senior Member Posts: 1,995 Joined: Dec 2013
RE: Getting 'N/D' to eval as a fraction not a decimal
(03-06-2015 08:32 PM)BruceH Wrote:  Well, I found a solution that (I think) always works, but it sure ain't elegant!

subst(N/D,N=N,D=D); gives '1/2'

Unfortunately that returns a single decimal fraction (not a ratio of two integers) if the non-programmable "Change apparent integers into exact integers" setting in CAS Settings (page 1, check box at end of line 3) is unchecked.

EDIT: Very non-elegant, but this works:

print(string(N)+"/"+string(D))

EDIT 2: Do NOT use the following method unless both N and D are always very small integers. If either N or D are large, it is prone to error, and it depends on the value of the system variable epsilon (CAS Settings, page 2):

print(exact(N/D))

<0|ɸ|0>
-Joe-
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 Messages In This Thread Getting 'N/D' to eval as a fraction not a decimal - BruceH - 03-05-2015, 07:57 AM RE: Getting 'N/D' to eval as a fraction not a decimal - Joe Horn - 03-06-2015, 03:50 AM RE: Getting 'N/D' to eval as a fraction not a decimal - BruceH - 03-06-2015, 08:32 PM RE: Getting 'N/D' to eval as a fraction not a decimal - Joe Horn - 03-07-2015 01:48 AM RE: Getting 'N/D' to eval as a fraction not a decimal - BruceH - 03-07-2015, 06:31 AM RE: Getting 'N/D' to eval as a fraction not a decimal - Joe Horn - 03-09-2015, 02:21 AM RE: Getting 'N/D' to eval as a fraction not a decimal - BruceH - 03-09-2015, 10:21 PM RE: Getting 'N/D' to eval as a fraction not a decimal - Joe Horn - 03-10-2015, 04:24 AM RE: Getting 'N/D' to eval as a fraction not a decimal - Han - 03-10-2015, 03:46 AM RE: Getting 'N/D' to eval as a fraction not a decimal - cyrille de brébisson - 03-10-2015, 06:26 AM RE: Getting 'N/D' to eval as a fraction not a decimal - Joe Horn - 03-11-2015, 04:23 AM RE: Getting 'N/D' to eval as a fraction not a decimal - cyrille de brébisson - 03-11-2015, 06:18 AM RE: Getting 'N/D' to eval as a fraction not a decimal - Joe Horn - 03-11-2015, 06:23 PM

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