How to place a number (1) in a random position in Line 1 in a matrix of zeros?

I have a Matrix M of zeros (10,10) and I would like to know how to place randomly a variable with the value of 1 into a random spot of the Matrix but ONLY in LINE 1 of the matrix M. How would i code this for M=zeros(10,10); ?

I guess randi and numel(M) would be a good idea but i have no idea of the code.

I would really appreciate an answer and would be really thankful!

Thank you!

Answer 1

[Image Analyst]

Try this:

M = zeros(10, 10);
yourVariable = 1;
column = randi(size(M, 2))
M(1, column) = yourVariable % Stuff the variable into the random column of row 1.

[robert]

thank you

[robert]

But is there a way to randomly place two number `1` in the Matrix, line 1, that always stay besides each other?

Thank you!

[John D'Errico]

If you want to place TWO 1's , side by side, then you just need to locate the FIRST 1. That must fall in position 1 through 9, randomly. The second 1 will always be the next element.

So if you understand how to put one 1 in some random position, then you should understand how to put two of them also.

Answer 2

[John D'Errico]

M = zeros(10,10);
M(1,randi(10)) = 1;

However, if you had no idea how to solve a basic problem of matrix indexing, you REALLY DESPERATELY NEED to start learning MATLAB. This is a basic issue, one that would be covered in the very first tutorials.

[robert]

thank you, i have just started learning