How to assign values to an array with broadcasting

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Bill Tubbs 2020-7-28

评论： Walter Roberson 2021-3-8

Is there any way to do broadcasting while assigning values to an array?

I know how to broadcast a computation:

G = zeros(3)
G + [1 2 3]

ans =

1 2 3

But I want to assign the above values to G directly:

G(:,:) = [1 2 3]

Unable to perform assignment because the size of the left side is 3-by-3 and the size of the right side is 1-by-3.

I know how to broadcast a simple scalar value:

G(:) = 1

G =

1 1 1

And I realise I could do this instead:

G(:,:) = repmat([1 2 3], 3, 1)

G =

1 2 3

But I wondered if there is a simpler way to assign a vector of values to all the rows using automatic broadcasting.

Judging by the answers to this question, I am guess not, but I wanted to check.

madhan ravi 2020-7-28

编辑：madhan ravi 2020-7-28

Your way of using repmat() is the easiest way.

AB WAHEED LONE 2021-3-8

For any dimension matrix,you can do

X=repmat(fading,20,1)

where fading is a matrix of any size. For me it was fading coefficient matrix

Walter Roberson 2021-3-8

repmat was discussed above. Bill was hoping for something more efficient.

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