Assign a value to a matrix element defined as a variable

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Geovane Gomes 2023-6-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1984644-assign-a-value-to-a-matrix-element-defined-as-a-variable

评论： Steven Lord 2023-6-17

采纳的回答： Torsten

在 MATLAB Online 中打开

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.

2 个评论
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Geovane Gomes 2023-6-17

编辑：Geovane Gomes 2023-6-17

在 MATLAB Online 中打开

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 2023-6-17

Use repmat or repelem.

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Answer 1

Torsten 2023-6-17

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1984644-assign-a-value-to-a-matrix-element-defined-as-a-variable#answer_1257979

移动：Torsten 2023-6-17

在 MATLAB Online 中打开

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
   3     0     0
   3     0     0
   3     0     0
   3     0     0
   3     0     0
   3     0     0
   3     0     0
   3     0     0
   3     0     0
   3     0     0