MATLAB: Is RQ decomposition function available in MATLAB

MATLAB

I would like to use RQ decomposition for my application, but the QR function in MATLAB only performs QR decomposition.

Best Answer

The RQ decomposition function is not available in MATLAB 7.6 (R2008a).

As a workaround, refer to the following submission in MATLAB central :

 <http://www.mathworks.com/matlabcentral/fileexchange/loadFile.do?objectId=16536>

Note that MathWorks does not guarantee or warrant the use or content of these submissions. Any questions, issues, or complaints should be directed to the contributing author.

Related Solutions

MATLAB: How to obtain the coordinates of the mouse on the screen displayed somewhere in the figure window

This enhancement has been incorporated in MATLAB 7.5 (R2007b).

As a workaround in previous MATLAB releases, you can use the following MATLAB function to track mouse motion:

function mousetrk
%MOUSETRK function to track mouse motion
% This function creates two static text controls
% which contain the x & y coordinates of the mouse
% The driving callback is executed by the
% WindowButtonMotionFcn of the figure.
figure
axes('Visible','off')
xbox = uicontrol('Style','text','Tag','xbox');
xboxlabel = uicontrol('Style','text','String','X Value',...
    'Position',get(xbox,'position')+[0 21 0 0]);
ybox = uicontrol('Style','text','Position',[90 20 60 20],'Tag','ybox');
yboxlabel = uicontrol('Style','text','String','Y Value',...
    'Position',get(ybox,'position')+[0 21 0 0]);
callback = ['pt = get(gca,''CurrentPoint'');'...
  'xbox = findobj(''Tag'',''xbox'');' ...
  'ybox = findobj(''Tag'',''ybox'');' ...
  'set(xbox,''String'',num2str(pt(1,1)));' ...
  'set(ybox,''String'',num2str(pt(1,2)));'];
set(gcf,'WindowButtonMotionFcn',callback);

For more information on the WindowButton functions, please refer to the Handle Graphics Property Browser:

https://www.mathworks.com/help/releases/R2009b/techdoc/infotool/hgprop/doc_frame.html

MATLAB: How to index into a structure/cell variable which is not yet evaluated and hence is not in the workspace

You can use the 'subsref' function to do the indexing work in 1 line:

subsref(subsref({dir('*.jpg')},struct('type','{}','subs',{{1}})),struct('type','.','subs','name'))

For better understanding, this long syntax can be deconstructed into 5 lines:

S1.type='{}';
S1.subs={1};
S2.type='.';
S2.subs='name';
subsref(subsref({dir('*.jpg')},S1),S2)

For more information about the 'subsref' function, please see the link:

https://www.mathworks.com/help/matlab/ref/subsref.html

Best Answer

Related Solutions

MATLAB: How to obtain the coordinates of the mouse on the screen displayed somewhere in the figure window

MATLAB: How to index into a structure/cell variable which is not yet evaluated and hence is not in the workspace

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