# How to create an original matrix by using non zero value indices?

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SUKUMAR NAGINENI on 19 Feb 2021
Edited: SUKUMAR NAGINENI on 20 Feb 2021
A = [1 0 0 0 1;
1 0 0 0 1 ;
1 0 0 0 0;
1 0 0 0 0;
1 0 0 0 0];
[R1 C1] = size(A); %% Size of A is 5 x 5
[X, Y] = find(A);
P = [X, Y];
P = [ 1 1;
2 1;
3 1;
4 1;
5 1;
1 5;
2 5];
[R2 C2] = size(P); %% Size of P is 7 x 2
How to create an original matrix (A) of the size 5 x 5 by using non zero value indices of variable P of the size 7 x 2 and remaining indices values are zero.
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### Accepted Answer

yanqi liu on 20 Feb 2021
sir, may be use the follows code
clc; clear all; close all;
A = [1 0 0 0 1;
1 0 0 0 1 ;
1 0 0 0 0;
1 0 0 0 0;
1 0 0 0 0];
%% Size of A is 5 x 5
[R1, C1] = size(A);
[X, Y] = find(A);
P = [X, Y];
P = [ 1 1;
2 1;
3 1;
4 1;
5 1;
1 5;
2 5];
%% Size of P is 7 x 2
[R2 C2] = size(P);
%% gen matrix
B = zeros(max(P(:,1)), max(P(:,2)));
loc = sub2ind(size(B), P(:,1), P(:,2));
B(loc) = 1;
disp(B)
isequal(A, B)
1 0 0 0 1
1 0 0 0 1
1 0 0 0 0
1 0 0 0 0
1 0 0 0 0
ans =
logical
1
>>
##### 1 CommentShowHide None
SUKUMAR NAGINENI on 20 Feb 2021
Dear yanqi liu
Thank you so much sir for your help,
you can read the book 《计算机视觉与深度学习实战 , This textbook link is not available on any website in India. If possible, kindly share the link to the soft copy of the book.
Thanks & regards
Sukumar.

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