How to create a matrix of ones and zeros with location of ones based on array that also contains zeros?

Question

esperanta 2023-1-24

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1899515-how-to-create-a-matrix-of-ones-and-zeros-with-location-of-ones-based-on-array-that-also-contains-zer

编辑： Dyuman Joshi 2023-1-24

Hi,

I have a vector V= [3 1 1 5 0 4], which contains both zeros and nonzero values, I want to obtain a matrix of ones and zeros with location of ones based on vector V. I tried the following code:

V= [3 1 1 5 0 4]

out=zeros(n,m);

m=numel(V);

n=max(V);

out = zeros(n, m);

idx=sub2ind([n m],V,1:m);

out(idx)=1

but I obtained the error: "Error using sub2ind. Out of range subscript".

If I remove the zero from V, the code above works.

My desired result is:

out =

0 1 1 0 0 0

0 0 0 0 0 0

1 0 0 0 0 0

0 0 0 0 0 1

0 0 0 1 0 0

Is it possible to obtain it without a for loop?

Thanks!

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Dyuman Joshi 2023-1-24

编辑：Dyuman Joshi 2023-1-24

在 MATLAB Online 中打开

You get the error because the code includes 0 as an index.

V = [3 1 1 5 0 4];
idx = V~=0;
m = max(V);
n = numel(V);
R = V;
C = 1:n;
Z = zeros(m,n);
out = sub2ind([m n], R(idx), C(idx));
Z(out) = 1
Z = 5×6
     0     1     1     0     0     0
     0     0     0     0     0     0
     1     0     0     0     0     0
     0     0     0     0     0     1
     0     0     0     1     0     0