Assign a value to a matrix element defined as a variable

Hi all,

Is it possible to assign values (variables) to elements in a matrix that is defined as a function handle?

For example:

prop1 = zeros(2);
prop1(:,1) = 1;
prop1(:,2) = 2;
prop1

prop1 = 2×2

1 2 1 2

prop2 = @(x) [0 0;
    0 0]

prop2 = function_handle with value:
    @(x)[0,0;0,0]

prop2(:,2) = @(x) x(2)

Nonscalar arrays of function handles are not allowed; use cell arrays instead.

I would like to assign variables to prop2 as I did to prop1.

[Geovane Gomes]

Is it possible to write the following function handle with less effort? Maybe with a couple of code lines.

prop = @(x) [x(1) x(3) 0 0;
    x(1) x(3) 0 0;
    x(1) x(3) 0 0;
    x(1) x(3) 0 0;
    x(1) x(3) 0 0;
    x(1) x(3) 0 0;
    x(1) x(3) 0 0;
    x(1) x(3) 0 0;
    x(1) x(3) 0 0;
    x(1) x(3) 0 0;
    x(1) x(3) 0 0;
    x(2) x(4) 0 0;
    x(2) x(4) 0 0;
    x(2) x(4) 0 0;
    x(2) x(4) 0 0;
    x(2) x(4) 0 0;
    x(2) x(4) 0 0;
    x(2) x(4) 0 0;
    x(2) x(4) 0 0;
    x(2) x(4) 0 0;
    x(2) x(4) 0 0;
    x(2) x(4) 0 0;
    x(2) x(4) 0 0];

[Steven Lord]

Use repmat or repelem.

Answer 1

[Torsten]

prop = @(x)[[x(1)*ones(11,1);x(2)*ones(12,1)],[x(3)*ones(11,1);x(4)*ones(12,1)],zeros(23,1),zeros(23,1)];
prop([1 2 3 4])

ans = 23×4

1 3 0 0 1 3 0 0 1 3 0 0 1 3 0 0 1 3 0 0 1 3 0 0 1 3 0 0 1 3 0 0 1 3 0 0 1 3 0 0

[Geovane Gomes]

It worked perfectly

Thanks!

Answer 2

[Voss]

prop = @(x)[x([repmat([1 3],11,1); repmat([2 4],12,1)]) zeros(23,2)];

[Geovane Gomes]

Great solution!

Thanks!