Changing elements with a condition

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Onur Güven
Onur Güven 2018-12-21
评论： Onur Güven 2018-12-21
Hi all,
I've some basic questions about changing the elements of a 9x9 matrix with a specific condition. The matrix is;
X1 =
0 0 0 0 0 0 0 0 0
0.2778 0.2800 0 0 0 0 0 0 0
0.2222 0.2000 0.3700 0 0 0 0 0 0
0.1333 0.1600 0.1750 0.4600 0 0 0 0 0
0.0889 0.0960 0.1400 0.1500 0.5950 0 0 0 0
0.0667 0.0640 0.0840 0.1200 0.1125 0.5950 0 0 0
0.0611 0.0480 0.0560 0.0720 0.0900 0.1125 0.6400 0 0
0.0444 0.0440 0.0420 0.0480 0.0540 0.0900 0.1000 0.6400 0
0.0222 0.0320 0.0385 0.0360 0.0360 0.0540 0.0800 0.1000 0.6400
And I want to create X2 as
0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0
0 0.278 0.280 0 0 0 0 0 0
0 0.222 0.200 0.370 0 0 0 0 0
0 0.133 0.160 0.175 0.460 0 0 0 0
0 0.089 0.096 0.140 0.150 0.595 0 0 0
0 0.067 0.064 0.084 0.120 0.113 0.595 0 0
0 0.061 0.048 0.056 0.072 0.090 0.113 0.640 0
0 0.044 0.044 0.042 0.048 0.054 0.090 0.100 0.640
And X3 as
0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0
0 0 0.278 0.280 0 0 0 0 0
0 0 0.222 0.200 0.370 0 0 0 0
0 0 0.133 0.160 0.175 0.460 0 0 0
0 0 0.089 0.096 0.140 0.150 0.595 0 0
0 0 0.067 0.064 0.084 0.120 0.113 0.595 0
0 0 0.061 0.048 0.056 0.072 0.090 0.113 0.640
Thanks to everyone for solution.
;
  2 个评论
Rik
Rik 2018-12-21
You mean you want to make a copy and assign zeros to specific rows and columns?

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采纳的回答

James Tursa
James Tursa 2018-12-21
clear X2 X3
[m,n] = size(X1);
X2(2:m,2:n) = X1(1:m-1,1:n-1);
X3(3:m,3:n) = X1(1:m-2,1:n-2);

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