How to make a permanent change to a matrix using sortrows?

16 Oct 2017
1 Answer
Answer Accepted
Updated 17 Oct 2017
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The code im writing, im using sort rows and its working great, it takes my array of random numbers and then puts it in order completely but it isnt a permanent change to the array. From what I can tell the last part of my code prints out the array,sorts it and then prints it again but the array goes back to normal? is there anyway to keep sortrow changes to my array?
a=0; b=0; c=0; d=0; e=0; f=0;
k = 80; u = 40; sigmas = .05; %GPa
c1 = (k + (4/3)*u) ; c2 = (k - (2/3)*u);
P = zeros(50,7);
N = zeros(10,6);
for i = 1:50
for j = 1:6
P(i,j) = (-.0025 + (.005*rand(1)));
end
end
%for di = 1:10
for i = 1:50
a = P(i,1); d = P(i,2); f = P(i,3); b = P(i,4); c = P(i,5); e = P(i,6);
sigmaxx = (a*c1 + a*c2 + a*c2); sigmayy = (d*c2 + d*c1 + d*c2);
sigmazz = (f*c2+f*c2+f*c1); sigmaxy = (2*b*u);
sigmazx = (2*c*u); sigmayz = (2*e*u);
F = ((sigmaxx - sigmayy)^2)+((sigmayy-sigmazz)^2)+((sigmaxx-sigmazz)^2)+6*((sigmaxy^2)+(sigmazx^2)+(sigmayz^2));
Cf = ((F - (2*sigmas^2))/(2*sigmas^2))^2;
P(i,7) = Cf;
end
disp(P)
sortrows(P,7)
disp(P)
>> GE
1.0e+05 *
0.0000 0.0000 -0.0000 0.0000 0.0000 0.0000 0.1659
0.0000 0.0000 -0.0000 0.0000 0.0000 -0.0000 0.3517
-0.0000 -0.0000 0.0000 -0.0000 -0.0000 0.0000 0.1382
0.0000 0.0000 0.0000 -0.0000 0.0000 0.0000 0.0815
-0.0000 0.0000 -0.0000 0.0000 0.0000 -0.0000 0.4886
0.0000 -0.0000 0.0000 0.0000 -0.0000 -0.0000 1.7163
0.0000 -0.0000 0.0000 -0.0000 0.0000 -0.0000 0.1106
0.0000 0.0000 0.0000 -0.0000 0.0000 0.0000 0.1178
0.0000 0.0000 -0.0000 -0.0000 0.0000 -0.0000 1.4394
-0.0000 0.0000 -0.0000 -0.0000 0.0000 0.0000 0.3773
-0.0000 -0.0000 -0.0000 -0.0000 0.0000 -0.0000 0.0505
-0.0000 -0.0000 -0.0000 -0.0000 -0.0000 -0.0000 0.1971
-0.0000 0.0000 0.0000 -0.0000 0.0000 0.0000 1.2847
0.0000 0.0000 0.0000 0.0000 -0.0000 -0.0000 0.0548
-0.0000 -0.0000 0.0000 -0.0000 -0.0000 0.0000 0.7923
-0.0000 -0.0000 0.0000 0.0000 -0.0000 0.0000 1.5805
0.0000 -0.0000 -0.0000 0.0000 0.0000 -0.0000 0.6276
0.0000 -0.0000 -0.0000 0.0000 -0.0000 0.0000 1.1048
0.0000 0.0000 0.0000 0.0000 -0.0000 -0.0000 0.0482
-0.0000 0.0000 -0.0000 -0.0000 -0.0000 0.0000 0.4118
0.0000 0.0000 -0.0000 -0.0000 0.0000 -0.0000 0.2474
-0.0000 -0.0000 0.0000 -0.0000 -0.0000 0.0000 0.5147
-0.0000 -0.0000 0.0000 0.0000 -0.0000 0.0000 0.7107
0.0000 0.0000 0.0000 0.0000 -0.0000 -0.0000 0.0695
0.0000 0.0000 -0.0000 -0.0000 -0.0000 0.0000 0.1451
0.0000 0.0000 -0.0000 -0.0000 0.0000 0.0000 0.8630
0.0000 -0.0000 0.0000 -0.0000 0.0000 0.0000 0.1166
-0.0000 -0.0000 0.0000 -0.0000 0.0000 -0.0000 0.1223
-0.0000 -0.0000 0.0000 0.0000 0.0000 -0.0000 0.8756
-0.0000 -0.0000 0.0000 0.0000 -0.0000 -0.0000 0.3255
0.0000 -0.0000 -0.0000 -0.0000 -0.0000 0.0000 0.8802
-0.0000 0.0000 -0.0000 -0.0000 0.0000 0.0000 1.6178
-0.0000 -0.0000 0.0000 -0.0000 -0.0000 -0.0000 1.8305
0.0000 -0.0000 -0.0000 -0.0000 -0.0000 0.0000 0.5213
-0.0000 0.0000 0.0000 -0.0000 -0.0000 0.0000 2.2296
-0.0000 0.0000 -0.0000 -0.0000 -0.0000 -0.0000 0.3583
0.0000 0.0000 0.0000 -0.0000 0.0000 -0.0000 0.1360
-0.0000 -0.0000 -0.0000 0.0000 -0.0000 -0.0000 0.0235
-0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.5958
-0.0000 -0.0000 -0.0000 0.0000 -0.0000 -0.0000 0.2636
0.0000 -0.0000 -0.0000 -0.0000 -0.0000 0.0000 1.1244
0.0000 -0.0000 -0.0000 0.0000 0.0000 0.0000 2.1475
-0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.3680
0.0000 -0.0000 0.0000 -0.0000 -0.0000 -0.0000 0.0437
-0.0000 0.0000 -0.0000 -0.0000 0.0000 0.0000 0.9815
-0.0000 -0.0000 0.0000 0.0000 0.0000 -0.0000 0.2089
0.0000 -0.0000 -0.0000 -0.0000 0.0000 0.0000 0.1444
0.0000 -0.0000 0.0000 0.0000 0.0000 0.0000 1.5641
-0.0000 0.0000 -0.0000 -0.0000 0.0000 0.0000 0.2793
-0.0000 0.0000 -0.0000 0.0000 -0.0000 0.0000 0.2917
ans =
1.0e+05 *
-0.0000 -0.0000 -0.0000 0.0000 -0.0000 -0.0000 0.0235
0.0000 -0.0000 0.0000 -0.0000 -0.0000 -0.0000 0.0437
0.0000 0.0000 0.0000 0.0000 -0.0000 -0.0000 0.0482
-0.0000 -0.0000 -0.0000 -0.0000 0.0000 -0.0000 0.0505
0.0000 0.0000 0.0000 0.0000 -0.0000 -0.0000 0.0548
0.0000 0.0000 0.0000 0.0000 -0.0000 -0.0000 0.0695
0.0000 0.0000 0.0000 -0.0000 0.0000 0.0000 0.0815
0.0000 -0.0000 0.0000 -0.0000 0.0000 -0.0000 0.1106
0.0000 -0.0000 0.0000 -0.0000 0.0000 0.0000 0.1166
0.0000 0.0000 0.0000 -0.0000 0.0000 0.0000 0.1178
-0.0000 -0.0000 0.0000 -0.0000 0.0000 -0.0000 0.1223
0.0000 0.0000 0.0000 -0.0000 0.0000 -0.0000 0.1360
-0.0000 -0.0000 0.0000 -0.0000 -0.0000 0.0000 0.1382
0.0000 -0.0000 -0.0000 -0.0000 0.0000 0.0000 0.1444
0.0000 0.0000 -0.0000 -0.0000 -0.0000 0.0000 0.1451
0.0000 0.0000 -0.0000 0.0000 0.0000 0.0000 0.1659
-0.0000 -0.0000 -0.0000 -0.0000 -0.0000 -0.0000 0.1971
-0.0000 -0.0000 0.0000 0.0000 0.0000 -0.0000 0.2089
0.0000 0.0000 -0.0000 -0.0000 0.0000 -0.0000 0.2474
-0.0000 -0.0000 -0.0000 0.0000 -0.0000 -0.0000 0.2636
-0.0000 0.0000 -0.0000 -0.0000 0.0000 0.0000 0.2793
-0.0000 0.0000 -0.0000 0.0000 -0.0000 0.0000 0.2917
-0.0000 -0.0000 0.0000 0.0000 -0.0000 -0.0000 0.3255
0.0000 0.0000 -0.0000 0.0000 0.0000 -0.0000 0.3517
-0.0000 0.0000 -0.0000 -0.0000 -0.0000 -0.0000 0.3583
-0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.3680
-0.0000 0.0000 -0.0000 -0.0000 0.0000 0.0000 0.3773
-0.0000 0.0000 -0.0000 -0.0000 -0.0000 0.0000 0.4118
-0.0000 0.0000 -0.0000 0.0000 0.0000 -0.0000 0.4886
-0.0000 -0.0000 0.0000 -0.0000 -0.0000 0.0000 0.5147
0.0000 -0.0000 -0.0000 -0.0000 -0.0000 0.0000 0.5213
-0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.5958
0.0000 -0.0000 -0.0000 0.0000 0.0000 -0.0000 0.6276
-0.0000 -0.0000 0.0000 0.0000 -0.0000 0.0000 0.7107
-0.0000 -0.0000 0.0000 -0.0000 -0.0000 0.0000 0.7923
0.0000 0.0000 -0.0000 -0.0000 0.0000 0.0000 0.8630
-0.0000 -0.0000 0.0000 0.0000 0.0000 -0.0000 0.8756
0.0000 -0.0000 -0.0000 -0.0000 -0.0000 0.0000 0.8802
-0.0000 0.0000 -0.0000 -0.0000 0.0000 0.0000 0.9815
0.0000 -0.0000 -0.0000 0.0000 -0.0000 0.0000 1.1048
0.0000 -0.0000 -0.0000 -0.0000 -0.0000 0.0000 1.1244
-0.0000 0.0000 0.0000 -0.0000 0.0000 0.0000 1.2847
0.0000 0.0000 -0.0000 -0.0000 0.0000 -0.0000 1.4394
0.0000 -0.0000 0.0000 0.0000 0.0000 0.0000 1.5641
-0.0000 -0.0000 0.0000 0.0000 -0.0000 0.0000 1.5805
-0.0000 0.0000 -0.0000 -0.0000 0.0000 0.0000 1.6178
0.0000 -0.0000 0.0000 0.0000 -0.0000 -0.0000 1.7163
-0.0000 -0.0000 0.0000 -0.0000 -0.0000 -0.0000 1.8305
0.0000 -0.0000 -0.0000 0.0000 0.0000 0.0000 2.1475
-0.0000 0.0000 0.0000 -0.0000 -0.0000 0.0000 2.2296
1.0e+05 *
0.0000 0.0000 -0.0000 0.0000 0.0000 0.0000 0.1659
0.0000 0.0000 -0.0000 0.0000 0.0000 -0.0000 0.3517
-0.0000 -0.0000 0.0000 -0.0000 -0.0000 0.0000 0.1382
0.0000 0.0000 0.0000 -0.0000 0.0000 0.0000 0.0815
-0.0000 0.0000 -0.0000 0.0000 0.0000 -0.0000 0.4886
0.0000 -0.0000 0.0000 0.0000 -0.0000 -0.0000 1.7163
0.0000 -0.0000 0.0000 -0.0000 0.0000 -0.0000 0.1106
0.0000 0.0000 0.0000 -0.0000 0.0000 0.0000 0.1178
0.0000 0.0000 -0.0000 -0.0000 0.0000 -0.0000 1.4394
-0.0000 0.0000 -0.0000 -0.0000 0.0000 0.0000 0.3773
-0.0000 -0.0000 -0.0000 -0.0000 0.0000 -0.0000 0.0505
-0.0000 -0.0000 -0.0000 -0.0000 -0.0000 -0.0000 0.1971
-0.0000 0.0000 0.0000 -0.0000 0.0000 0.0000 1.2847
0.0000 0.0000 0.0000 0.0000 -0.0000 -0.0000 0.0548
-0.0000 -0.0000 0.0000 -0.0000 -0.0000 0.0000 0.7923
-0.0000 -0.0000 0.0000 0.0000 -0.0000 0.0000 1.5805
0.0000 -0.0000 -0.0000 0.0000 0.0000 -0.0000 0.6276
0.0000 -0.0000 -0.0000 0.0000 -0.0000 0.0000 1.1048
0.0000 0.0000 0.0000 0.0000 -0.0000 -0.0000 0.0482
-0.0000 0.0000 -0.0000 -0.0000 -0.0000 0.0000 0.4118
0.0000 0.0000 -0.0000 -0.0000 0.0000 -0.0000 0.2474
-0.0000 -0.0000 0.0000 -0.0000 -0.0000 0.0000 0.5147
-0.0000 -0.0000 0.0000 0.0000 -0.0000 0.0000 0.7107
0.0000 0.0000 0.0000 0.0000 -0.0000 -0.0000 0.0695
0.0000 0.0000 -0.0000 -0.0000 -0.0000 0.0000 0.1451
0.0000 0.0000 -0.0000 -0.0000 0.0000 0.0000 0.8630
0.0000 -0.0000 0.0000 -0.0000 0.0000 0.0000 0.1166
-0.0000 -0.0000 0.0000 -0.0000 0.0000 -0.0000 0.1223
-0.0000 -0.0000 0.0000 0.0000 0.0000 -0.0000 0.8756
-0.0000 -0.0000 0.0000 0.0000 -0.0000 -0.0000 0.3255
0.0000 -0.0000 -0.0000 -0.0000 -0.0000 0.0000 0.8802
-0.0000 0.0000 -0.0000 -0.0000 0.0000 0.0000 1.6178
-0.0000 -0.0000 0.0000 -0.0000 -0.0000 -0.0000 1.8305
0.0000 -0.0000 -0.0000 -0.0000 -0.0000 0.0000 0.5213
-0.0000 0.0000 0.0000 -0.0000 -0.0000 0.0000 2.2296
-0.0000 0.0000 -0.0000 -0.0000 -0.0000 -0.0000 0.3583
0.0000 0.0000 0.0000 -0.0000 0.0000 -0.0000 0.1360
-0.0000 -0.0000 -0.0000 0.0000 -0.0000 -0.0000 0.0235
-0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.5958
-0.0000 -0.0000 -0.0000 0.0000 -0.0000 -0.0000 0.2636
0.0000 -0.0000 -0.0000 -0.0000 -0.0000 0.0000 1.1244
0.0000 -0.0000 -0.0000 0.0000 0.0000 0.0000 2.1475
-0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.3680
0.0000 -0.0000 0.0000 -0.0000 -0.0000 -0.0000 0.0437
-0.0000 0.0000 -0.0000 -0.0000 0.0000 0.0000 0.9815
-0.0000 -0.0000 0.0000 0.0000 0.0000 -0.0000 0.2089
0.0000 -0.0000 -0.0000 -0.0000 0.0000 0.0000 0.1444
0.0000 -0.0000 0.0000 0.0000 0.0000 0.0000 1.5641
-0.0000 0.0000 -0.0000 -0.0000 0.0000 0.0000 0.2793
-0.0000 0.0000 -0.0000 0.0000 -0.0000 0.0000 0.2917

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 Accepted Answer

Cedric
Cedric on 16 Oct 2017
Edited: Cedric on 16 Oct 2017

1 vote

P = sortrows(P,7) ;
Most of the time functions don't operate "externally", so SORTROWS doesn't alter your array P defined in the workspace. It creates a new sorted array that it outputs. You have to store this output back into P if you want P to be the sorted version. If you wanted to keep the original, you could store it into a new variable:
P_sorted = sortrows(P,7) ;

4 Comments
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Shawn Blancett
Shawn Blancett on 16 Oct 2017
Thanks for the reply, that makes a lot of sense why it would work that way.
Shawn Blancett
Shawn Blancett on 17 Oct 2017
Hey if you dont mind me asking, is there a way to run a script that produces a plot more than once , in the end plotting 10 lines on the same graph?
Cedric
Cedric on 17 Oct 2017
Edited: Cedric on 17 Oct 2017
Yes, execute
hold on
before or after the first plot, and the following will be added as overlays.

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Asked:

Shawn Blancett
Shawn Blancett
on 16 Oct 2017

Edited:

Cedric
Cedric
on 17 Oct 2017

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