Hello Reco,
> Being so if i change the labels , and do zlabel="Y axis" ,
> ylabel="Z label" (in the draw3d instruction), i get what i want ,
> but , to maintain consistency , i still need to swap the values -m-
> and -n-, in all vector definitions!And it is a prone error method , i
> 'd like to know if there is a way to simply swap , axis drawn in the
> gnuplot window , say swap z with y , for example.
>
You can't do that from Maxima's syntax. A quick look at the Gnuplot
manual didn't give me any idea on how to do that.
Some time ago, someone suggested me the idea to introduce the
possibility of making transformations before rendering, like rotations
or symmetries. For example, you define a basic function like x^2+y^2 and
then apply to it translations and/or rotations in order to orientate it
in any direction. Maybe such a feature could be of some help in cases
like yours.
> The output of the former expresssion , that originates vector vx ,
> ( = linsolve_by_lu(A,b) ) returns what seems a vector , as maxima
> interprets it.So when i try to use this value to draw this vector
> (with the former draw3d() instrcution) i get the error :
>
> draw (vector): coordinates are not correct
>
Graphic object 'vector' expects two lists as arguments, and the output
of linsolve_by_lu contains a column matrix. You have to transform it
into a list; try
(%i1) display2d:false $
(%i2) linsolve_by_lu(matrix([5,7],[9,6]), matrix([1],[1]));
0 errors, 0 warnings
(%o2) [matrix([1/33],[4/33]),false]
(%i3) first(transpose(first(%)));
(%o3) [1/33,4/33]
--
Mario