put smaller matrix in bigger matrix

Question

Andrea 2012-5-30

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Hello I have row=[1 2 5 4 3 6] and column=[5 7 3 4 8 14]. I want to select and put each Q(row,column) in a new data. for example Q(row(1),column(1)), Q(row(2),column(2)), and Q(row(3), column(3)), .. . I want to put these Q in a new matrix P. Can anybody help me? something like this that does not work: P=Q((1:row),(1:column)) or P=Q(row,column)

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Rahul 2012-5-30

How do you want output

q= 1 5

2 7

5 3

4 4

3 8

6 14

Is this how your output q should look like? give an example of your output..

Andrea 2012-5-30

No. These are the indicators of row and col. for example Q(row(1),column(1))=10, Q(row(2),column(2))=25 , and Q(row(3), column(3))=12 and ....

I want to to put them in a matrix P=zeros(size(Q)). in the way their arrangement will not change.

please see this example:

Q =

1 2 3 4 5 6

3 2 1 6 5 4

0 1 10 5 5 1

8 7 9 8 1 0

row = [2 3];

col= [ 4 5 6];

P =

6 5 4 0 0 0

5 5 1 0 0 0

0 0 0 0 0 0

and then, I want to select another sub-matrix (with different size such as 1*2) and put it right next to the first part in Matrix P.

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Answer 1

Andrei Bobrov 2012-5-30

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/39877-put-smaller-matrix-in-bigger-matrix#answer_49500

在 MATLAB Online 中打开

eg:

Q = randi(456,10,15);
row=[1 2 5 4 3 6];
column=[5 7 3 4 8 14];
P = Q(sub2ind(size(Q),row,column));

EDIT

p = Q(row,column);
P = zeros(size(Q));
P(1:numel(row),1:numel(column)) = p;

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Andrea 2012-5-30

Just one issue occurs. I need matrix p to have Q(row(1),column(1)), Q(row(1),column(1)), Q(row(2),column(2)), Q(row(3),column(3)), Q(row(4),column(4)), Q(row(5),column(5)), and Q(row(6),column(6)). But what (p = Q(row,column);) give me is a 6*6 matrix in this way Q(row(1),column(1)), Q(row(1),column(2)), Q(row(1),column(3)), Q(row(1),column(4)), and..... How can solve this problem?