# [Maxima] units

C Y smustudent1 at yahoo.com
Wed Jan 10 10:07:10 CST 2007

```I should probably warn you that this units package was never really
finished and is basically unsupported - Robert Dodier also has a units
package and you might want to try that instead.

That said, I think the command you want is:
setunits([N,m]);

CY

--- Micha³ Tworek <lotnick at epf.pl> wrote:

> Hi,all :-)
> I've got troubles with units . I read
> http://maxima.sourceforge.net/docs/manual/pt/maxima_71.html .
>
> What am I doing? This is my example.First with mass,acceleration and
> force...everything OK. But from i7 you'll see that I have troubles
> with calculate [kg/s^2] to [N/m] .Sometimes I get outputs for q in
> these units, but I need outputs in  N/m . I'm not going to explain
> everyone that these units are equal.
>
> By hand:  [kg/s^2]=[ (N*s^2)/m    /  s^2 ]= [N/m]
>
> >From maxima:
>
>
>
> *******************************************************************
> *                       Units version 0.50                        *
> *          Definitions based on the NIST Reference on             *
> *              Constants, Units, and Uncertainty                  *
> *       Conversion factors from various sources including         *
> *                   NIST and the GNU units package                *
> *******************************************************************
>
> Redefining necessary functions...
> Initializing unit arrays...
> Done.
> (%i2) Mass:70*kg;
> (%o2) 70*kg
> (%i3) acceleration:9.81*[m/s^2];
> (%o3) [9.810000000000001*m/s^2]
> (%i4) Force:Mass*acceleration;
> (%o4) [686.7000000000001*(kg*m)/s^2]
> (%i5) setunits(N);
> (%o5) done
> (%i6) Force;
> (%o6) [6867/10*N]
> (%i7) q:287*[kg/s^2];
> (%o7) [287*kg/s^2]
> (%i8) setunits(N,m);
> Too many arguments supplied to setunits(units):
> [N,m]
>  -- an error.  To debug this try debugmode(true);
> (%i9) setunits[(N,m)];
> (%o9) setunits[m]
> (%i10) q;
> (%o10) [287*kg/s^2]
> (%i11) setunits[(N,m)];
> (%o11) setunits[m]
> (%i12) q;
> (%o12) [287*kg/s^2]
> (%i13) setunits(N/m);
> Argument to `concat' not an atom: %force/%length
> #0: setunits(units=[N/m])(unit.mac line 606)
> #1: setunits(units=N/m)(unit.mac line 624)
>  -- an error.  To debug this try debugmode(true);
> (%i14) setunits[N/m];
> (%o14) setunits[N/m]
> (%i15) q;
> (%o15) [287*kg/s^2]
> (%i16)
>
************************************************************************************************************
> Anyone knows what to do?
>
>
>
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