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'rotating' matrix data around one point

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Doubutsu
Doubutsu 2014-3-17
评论： Doubutsu 2014-3-18
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
  1 个评论
Doubutsu
Doubutsu 2014-3-18
I wanted to know this to solve a problem I had. But now the problem was solved on an other way, so I don't need to know this anymore. Thanks everyone for helping!

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Andrei Bobrov
Andrei Bobrov 2014-3-17
编辑：Andrei Bobrov 2014-3-17
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));
  1 个评论
Doubutsu
Doubutsu 2014-3-17
thanks a lot.
It does what I wanted it to do, but how does it work? Could you please explain it to me, because I don't understand it at all (I am not that good with matlab).
Thanks in advance

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更多回答（1 个）

Jos (10584)
Jos (10584) 2014-3-17
You can use CIRCSHIFT to move the a point to the centre of the matrix, and then apply ROT90 to rotate it, and apply CIRCSHIFT again.
M1 = magic(5)
rotpos = [0 1] % position of rotation point
M2 = circshift(M1,-rotpos)
M3 = rot90(M2)
M4 = circshift(M3, rotpos)
I am not sure if this is what you're really after though ...

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