MATLAB: ‘rotating’ matrix data around one point

matrix manipulation

Hi everyone,
I am having the following matrix:
   -0.0052   -0.0113   -0.0178   -0.0157   -0.0053    0.0033    0.0073    0.0080    0.0071
   -0.0032   -0.0152   -0.0433   -0.0370   -0.0014    0.0144    0.0173    0.0150    0.0114
    0.0062    0.0026   -0.1158   -0.0565    0.0423    0.0467    0.0380    0.0267    0.0173
    0.0205    0.0551    0.2696    0.3313    0.1654    0.1145    0.0758    0.0435    0.0237
    0.0268    0.0611    0.1415    0.2187    0.2313    0.2187    0.1415    0.0611    0.0268
    0.0237    0.0435    0.0758    0.1145    0.1654    0.3313    *0.2696*    0.0551    0.0205
    0.0173    0.0267    0.0380    0.0467    0.0423   -0.0565   *-0.1158*    0.0026    0.0062
    0.0114    0.0150    0.0173    0.0144   -0.0014   -0.0370   -0.0433   -0.0152   -0.0032
    0.0071    0.0080    0.0073    0.0033   -0.0053   -0.0157   -0.0178   -0.0113   -0.0052
Now I want the data to 'move' around one of the 'points' in the matrix, namely the one between the marked points (0.2696 and -0.01158). So I want to -0.0433 point to be in the place of the -0.0370 point and the -0.0370 point one the place of the -0.0565 point and so on. I have no idea how to do this. Hopefully one of you will know.
Thanks in advance

Best Answer

data = [  -0.0052000  -0.0113000  -0.0178000  -0.0157000  -0.0053000   0.0033000   0.0073000   0.0080000   0.0071000
  -0.0032000  -0.0152000  -0.0433000  -0.0370000  -0.0014000   0.0144000   0.0173000   0.0150000   0.0114000
   0.0062000   0.0026000  -0.1158000  -0.0565000   0.0423000   0.0467000   0.0380000   0.0267000   0.0173000
   0.0205000   0.0551000   0.2696000   0.3313000   0.1654000   0.1145000   0.0758000   0.0435000   0.0237000
   0.0268000   0.0611000   0.1415000   0.2187000   0.2313000   0.2187000   0.1415000   0.0611000   0.0268000
   0.0237000   0.0435000   0.0758000   0.1145000   0.1654000   0.3313000   0.2696000   0.0551000   0.0205000
   0.0173000   0.0267000   0.0380000   0.0467000   0.0423000  -0.0565000  -0.1158000   0.0026000   0.0062000
   0.0114000   0.0150000   0.0173000   0.0144000  -0.0014000  -0.0370000  -0.0433000  -0.0152000  -0.0032000
   0.0071000   0.0080000   0.0073000   0.0033000  -0.0053000  -0.0157000  -0.0178000  -0.0113000  -0.0052000];
s = size(data);
ii = [6 7]; % index rows
jj = [7 7]; % index of columns
z = zeros(s);
z(sub2ind(s,ii,jj)) = 1;
t = 0 + (bwdist(z,'ch') == 1);
boundaries = bwboundaries(t,8);
b = boundaries{1}(1:end-1,:);
b1 = b*[1; s(1)] - s(1);
out = data;
out(b1) = out(circshift(b1,1));
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