Thanks to all who presented their ideas on how to address this issue with
J. As usual, I learn a lot from the users of this Forum!
F.
On Fri, Dec 18, 2020 at 8:58 AM Francesco Pedulla' wrote:
> Dear all,
> I need to represent the 2D rotation matrix 'R'
>
> R = |cos(t
mple:
>R"0(0 30p1 45p1 60p1%180)
>1 0
>0 1
>
> 0.866025 _0.5
> 0.5 0.866025
>
> 0.707107 _0.707107
> 0.707107 0.707107
>
> 0.5 _0.866025
> 0.866025 0.5
>
> FYI,
>
> --
> Raul
>
>
((cos , -@sin) ,: sin , cos)
>
> R 1r6p1
>
> 0.866025 _0.5
>
> 0.5 0.866025
>
>
> Ben
>
> On Fri, 18 Dec 2020 at 18:59, Francesco Pedulla' wrote:
>
> > Dear all,
> > I need to represent the 2D rotation matrix 'R'
> >
> > R = |
Dear all,
I need to represent the 2D rotation matrix 'R'
R = |cos(t) -sin(t)|
|sin(t) cos(t)|
and compute it for different values of the rotation angle 't'. I am aware
the matrix of function can be represented as a gerund, which I like:
R =: 2 2$cos`(-@sin)`sin`cos .
To compute R(t),
>
> On Mon, Apr 1, 2019 at 6:40 AM bill lam wrote:
>
> > I guess some client driver missing Anyways, this addon has not been
> > maintained for several years. You better download the data/odbc addons.
> It
> > should also work with mysql if you have installed
Dear all,
this is the first time I try to connect the J interpreter to an external
RDBMS, so it is likely I'm doing something wrong - unfortunately, I cannot
tell what...
The PC I am using runs Windows 7 Enterprise SP1. The intepreter version is
J806. The RDBMS is mySQL 5.7, which I can easily con
Hello everybody,
I am using J801 under Ubuntu. Here is a behaviour I do not understand:
mat=:i.2 3
r90=:|."1@:|:"2
r90^:0 mat
0 1 2
3 4 5
r90^:1 mat
3 0
4 1
5 2
r90^:2 mat
5 4 3
2 1 0
So far, so good. But:
r90^:(i.3) mat
0 1 2
3 4 5
0 0 0
3 0 0
4 1 0
5 2 0
5 4 3
2 1 0
0 0 0
