Display decimal as a fraction?
The number 1.5 represents 3/2 in decimal form.
In sage I can get 3/2 to display as a decimal: 3/2.n()
I haven't had any luck converting 1.5 to a fraction.
The number 1.5 represents 3/2 in decimal form.
In sage I can get 3/2 to display as a decimal: 3/2.n()
I haven't had any luck converting 1.5 to a fraction.
answered 2016-03-01 01:59:46 +0200
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1.5 equals to 1 1/2 .
I ran across another way that's posted here where the author, John D Cook mentions the nsimplify
command in SymPy (which you can can access in Sage). As the post indicates, you can suggest constants (eg pi) that should be considered and "...can also give nsimplify a tolerance, asking it to find a simple representation within a neighborhood of the number". Here's a screenshot of it recognizing 1.3333333333333 in a Sage Cell Server.
You can try:
sage: QQ(1.5)
3/2
or:
sage: (1.5).exact_rational()
3/2
As a warning, i let you undertand the following behaviour with decimal numbers:
sage: (1.1).exact_rational()
2476979795053773/2251799813685248
Indeed. 4/3 is not a floating-point number since it can not be written as `p/2^q`. So, when you write sage: a = RR(4/3) You only get an approximation of `4/3`, whose value is sage: a.exact_rational() 6004799503160661/4503599627370496 If you want to recover `4/3` from `a`, you can do sage: a.simplest_rational() 4/3 or, sage: QQ(a) 4/3 But you should understand that two roundings were done during your computation, and that you may have lost something there.
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Asked: 2013-06-30 20:32:27 +0200
Seen: 31,454 times
Last updated: Sep 15 '13
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