# [Maxima] Significant Figures and Decimal Places

Chibisi Chima-Okereke chibco at gmail.com
Wed Jun 11 09:52:28 CDT 2008

```Hi Stavros, thanks alot for that explanation.

Kind regards

Chibisi

On Wed, Jun 11, 2008 at 2:19 PM, Stavros Macrakis <macrakis at alum.mit.edu>
wrote:

> To control the number of digits displayed for floating-point numbers, set
> fpprintprec.  To calculate to an arbitrary precision, use fpprec and use
> bigfloats (with B instead of E for the exponent).
>
> Example:
>
> (%i1) sin(2.3);
> (%o1)                           0.74570521217672                <<< regular
> floating point
> (%i2) fpprintprec:4;
> (%o2)                                   4
> (%i3) sin(2.3);
> (%o3)                                 0.75                   <<< should
> really have printed 0.7457
> (%i4) sin(2.3b0);
> (%o4)                               7.457b-1               <<< bfloats can
> have their precision set, but display is also controlled by fpprintprec
> (%i5) fpprec:100;
> (%o5)                                  100
> (%i6) sin(2.3b0);
> (%o6)                               7.457b-1          <<< calculated to 100
> digits, but displayed to 4 digits
> (%i7) fpprintprec:fpprec;
> (%o7)                                  100
> (%i8) sin(2.3b0);
> (%o8)
> 7.457052121767201773854062116434995389426487780204742575076282805000009931390472578711914171840928876b-1
> (%i9) %o4;
> (%o9)                        7.457052121767202b-1                   <<< %o4
> was calculated to default fpprec (16)
> (%i10) %o6;
> (%o10)
> 7.457052121767201773854062116434995389426487780204742575076282805000009931390472578711914171840928876b-1
>
>                                                                    <<< %o6
> was calculated with fpprec=100; here is the full display
>
>
> On Tue, Jun 10, 2008 at 7:56 AM, Chibisi Chima-Okereke <chibco at gmail.com>
> wrote:
>
>> Dear All,
>>
>> I am a new user to Maxima, and I can't see a function to display numerical
>> outputs to a certain number of significant figures or decimal places. I have
>> seen the floor, ceiling, and round functions, but was wandering if there is
>> something for significant figures or decimal places.
>>
>> Kind Regards
>>
>> Chibisi
>>
>> _______________________________________________
>> Maxima mailing list
>> Maxima at math.utexas.edu
>> http://www.math.utexas.edu/mailman/listinfo/maxima
>>
>>
>
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