[Scilab-users] How to assign column data to mlist?

[jrafaelbguerra at hotmail.com]

Hi Samuel,


Thanks for shedding light about these less well documented yet advanced features of the Scilab language.


Best regards


Rafael



Sent by Outlook for Android


From: Samuel Gougeon

Sent: Tuesday 14 July 13:22

Subject: Re: [Scilab-users] How to assign column data to mlist?

To: International users mailing list for Scilab.


Le 13/07/2015 23:53, Rafael Guera a écrit :


Samuel,





Thanks for the detailed explanation.





Not sure of what M(i) should mean in a situation where the matrices have different sizes:





data1= ones(10,4);


data2= zeros(5,3);


M = mlist(['V', 'field1', 'field2']);


M.field1 = data1;


M.field2 = data2;





or when the mlist fields are N-dimensional with different dimensions and/or sizes.





PS:


why not defining  M(i) = M.field#i ?


Do you mean the ith field?

Why not. But mlists are designed to be array-oriented, as cells and structures are:

>From help mlist:

" mlist object is very similar to tlist object. The only difference concerns the extraction and

 insertion syntax: if M is an mlist, for any index i which is not a field name, M(i) is no more the

 i-th field of the list."


If you wish (i) selecting a field, how will you select a component of the M array?


I mean, using i to select a field puts two way for the same purpose (selecting a field, either by its name, or by its index), and removes a way to select a component from the array.


What you wish looks like a simple tlist, with index just shifted by one to ignore the identification vector:

-->t = tlist(["test" "r" "b" "p"], %pi, %f, %z)

 t  =

       t(1)

!test  r  b  p  !

       t(2)

    3.1415927

       t(3)

  F

       t(4)

    z


-->t(3)

 ans  =

  F


-->t.b

 ans  =

  F


Samuel



On Tue, Jul 14, 2015 at 3:22 AM -0700, "Samuel Gougeon" <sgougeon at free.fr> wrote:
Le 13/07/2015 23:53, Rafael Guera a écrit :
>
> Samuel,
>
> Thanks for the detailed explanation.
>
> Not sure of what M(i) should mean in a situation where the matrices
> have different sizes:
>
> data1=ones(10,4);
>
> data2=zeros(5,3);
>
> M=mlist(['V','field1','field2']);
>
> M.field1=data1;
>
> M.field2=data2;
>
> or when the mlist fields are N-dimensional with different dimensions
> and/or sizes.
>
> PS:
>
> why not defining M(i) = M.field#i ?
>
Do you mean the ith field?
Why not. But mlists are designed to be array-oriented, as cells and
structures are:
 From help mlist:
" mlist object is very similar to tlist object. The only difference
concerns the extraction and
  insertion syntax: if M is an mlist, for any index i which is not a
field name, M(i) is no more the
  i-th field of the list."

If you wish (i) selecting a field, how will you select a component of
the M array?

I mean, using i to select a field puts two way for the same purpose
(selecting a field, either by its name, or by its index), and removes a
way to select a component from the array.


What you wish looks like a simple tlist, with index just shifted by one
to ignore the identification vector:
-->t = tlist(["test" "r" "b" "p"], %pi, %f, %z)
  t  =
        t(1)
!test  r  b  p  !
        t(2)
     3.1415927
        t(3)
   F
        t(4)
     z

-->t(3)
  ans  =
   F

-->t.b
  ans  =
   F

Samuel

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