Re: [Reduce-algebra-developers] How to read a matrix from file, into reduce script?

[Nasser M. A. <nm...@12...>]

I found it. So I am ok.

It is

    in  "A.mat";

I just needed to add

    end;

At the end of my A.mat to make reduce happy.

Strange I could not find this command in the manual. But I just
saw the help pages that come with Reduce which is much easier
to use than the manual.

--Nasser

On 1/6/2024 1:50 AM, Nasser M. Abbasi wrote:
> Currently my script has matrix of data I want to process.
> 
> So the matrix is inside the script itself.
> 
> But I'd like to separate the matrix from the script,
> and just have the script read the matrix from a file,
> as I will have many different matrices to process.
> 
> This is what I have now:
> 
> ---- file.red-----
> 
> load_package "algint";
> off nat;
> % off echo;
> linelength 4000;
> 
> COMMENT  These are integration problems to solve;
> 
> matrix A;
> A:=mat(( (x^6-x^5+x^4-x^3+1)*exp(x),x),
>          ( (-x^2+2)*exp(x/(x^2+2))/(x^3+2*x),x ),
>          ( (2*x^4-x^3+3*x^2+2*x+2)*exp(x/(x^2+2))/(x^3+2*x),x   ),
>          ( (1+exp(x))*exp(exp(x)+x)/(exp(x)+x),x   ),
>          ( exp(1+1/ln(x))*(-1+ln(x)^2)/ln(x)^2,x   ),
>          ( exp(x+1/ln(x))*(-1+(1+x)*ln(x)^2)/ln(x)^2,x   ) )$
> 
> 
> nrows := part(length(A),1)$
> 
> etc.., the rest of the script..
> -------------------------
> 
> Which I run using
> 
>            redcsl < file.red
> 
> WHat I'd like to do is put the matrix in its own file.
> say A.mat
> 
> ------- A.mat---------------
> matrix A;
> A:=mat(( (x^6-x^5+x^4-x^3+1)*exp(x),x),
>          ( (-x^2+2)*exp(x/(x^2+2))/(x^3+2*x),x ),
>          ( (2*x^4-x^3+3*x^2+2*x+2)*exp(x/(x^2+2))/(x^3+2*x),x   ),
>          ( (1+exp(x))*exp(exp(x)+x)/(exp(x)+x),x   ),
>          ( exp(1+1/ln(x))*(-1+ln(x)^2)/ln(x)^2,x   ),
>          ( exp(x+1/ln(x))*(-1+(1+x)*ln(x)^2)/ln(x)^2,x   ) )$
> --------------------------------
> 
> And read file.red read that file at the start.
> 
> But I do not see a command to do this looking at the manual PDF file.
> 
> The matrix will always be called variable A if this makes
> any difference and the input file can be A.mat or any other name.
> 
> Is this possible to do in Reduce? I am using rev 6657 on
> Linux.
> 
> In Maple, I just do
> 
>          read file.mpl
> 
> And this reads any Maple expressions/variables in file.mpl
> 
> Thanks
> --Nasser