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Re: Applying each element of a vector to each row of a matrix
From: |
Jonathan Webster |
Subject: |
Re: Applying each element of a vector to each row of a matrix |
Date: |
Mon, 20 Dec 2010 02:07:29 -0500 |
User-agent: |
Thunderbird 2.0.0.24 (X11/20101213) |
Jordi Gutiérrez Hermoso wrote:
On 19 December 2010 14:59, Jonathan Webster <address@hidden> wrote:
Having done a long stint at work using APL, and wanting to save my time
rather than the computer's time, I long ago wrote rho.m , implementing
the arbitrary reshape properties of the APL operator of that name. I
can supply it if anyone is interested.
Yes please. More code for the sharin' (and I promise I'll get around
some day to finishing that website that should make this kind of
sharing easier).
- Jordi G. H.
Here are further examples:
octave:3> vex = 1:3
vex =
1 2 3
octave:4> mm = rho ( 2,3,3)
mm =
2 2 2
2 2 2
2 2 2
octave:5> mmm = mm .^ rho(vex,3,3)
mmm =
2 4 8
2 4 8
2 4 8
octave:6> (rho ( 2,3,3) .^ rho((1:3),3,3))
ans =
2 4 8
2 4 8
2 4 8
Be well,
Jonathan
function [arout,ver] = rho( arin,ny,nx)
% function arout = rho( arin,ny,nx)
% inslpired in name and function by the APL operator of the same name
% does NOT use Fortran indexing: fills rows first
%author: JCWebster
%cdate: 4/27/2000
%purpose: utility routine like the APL operator 'rho'
%modified: 6/15/2000 to add revision number
ver = ["RHO","1.2"];
[nyi,nxi]= size(arin);
if (nyi >= 1)
arin = reshape (arin,1,(nyi*nxi));
endif
nnTot = ny * nx ; % total number of elemenents in output
arout = zeros(1,nnTot);
lengIn = length( arin); % length of input
ii = 0; % counter in input arg
for iii = 1:nnTot
ii++;
arout(1,iii) = arin(1,ii);
if(ii>=lengIn)
ii=0;
end
end
arout = reshape(arout, nx,ny)';
- Applying each element of a vector to each row of a matrix, Jordi Gutiérrez Hermoso, 2010/12/19
- Re: Applying each element of a vector to each row of a matrix, Martin Helm, 2010/12/19
- Re: Applying each element of a vector to each row of a matrix, Jordi Gutiérrez Hermoso, 2010/12/19
- Re: Applying each element of a vector to each row of a matrix, Martin Helm, 2010/12/19
- Re: Applying each element of a vector to each row of a matrix, Jordi Gutiérrez Hermoso, 2010/12/19
- Re: Applying each element of a vector to each row of a matrix, Martin Helm, 2010/12/19
- Re: Applying each element of a vector to each row of a matrix, Jordi Gutiérrez Hermoso, 2010/12/19
- Re: Applying each element of a vector to each row of a matrix, Olaf Till, 2010/12/19
- Re: Applying each element of a vector to each row of a matrix, Jonathan Webster, 2010/12/19
- Re: Applying each element of a vector to each row of a matrix, Jordi Gutiérrez Hermoso, 2010/12/20
- Re: Applying each element of a vector to each row of a matrix,
Jonathan Webster <=
- Re: Applying each element of a vector to each row of a matrix, Jordi Gutiérrez Hermoso, 2010/12/19
- Re: Applying each element of a vector to each row of a matrix, Judd Storrs, 2010/12/19
- Re: Applying each element of a vector to each row of a matrix, Martin Helm, 2010/12/19
- Re: Applying each element of a vector to each row of a matrix, Francesco Potortì, 2010/12/20
- Re: Applying each element of a vector to each row of a matrix, Judd Storrs, 2010/12/20
- Re: Applying each element of a vector to each row of a matrix, Judd Storrs, 2010/12/19
- Re: Applying each element of a vector to each row of a matrix, Jordi Gutiérrez Hermoso, 2010/12/20
Re: Applying each element of a vector to each row of a matrix, Jaroslav Hajek, 2010/12/20