How can i use a struct/cell in a Function?

Question

Timon Niedecken 2018-5-15

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/400880-how-can-i-use-a-struct-cell-in-a-function

评论： Timon Niedecken 2018-5-15

I have a given struct and want to combine the data within it to one array. Therefore i wrote this Function:

function vector = combinedata(Input)
n = length(Input.features);
j = 1;
for i = 1:n
    nn = length(data.features{1,i}.geometry.coordinates);
    for ii = 1:nn
        vector(j,1) = data.features{1,i}.geometry.coordinates(ii,1);
        vector(j,2) = data.features{1,i}.geometry.coordinates(ii,2);
        j = j+1;
    end
end

but when i try it, i get following error message:

pray = combinedata(data)
Undefined variable "data" or class "data.features".
Error in combinedata (line 5)
    nn = length(data.features{1,i}.geometry.coordinates);

I have tried it outside the function and was able to use the length function without problems:

length(data.features{1,10}.geometry.coordinates)
ans =
       4

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Answer 1

James Tursa 2018-5-15

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https://ww2.mathworks.cn/matlabcentral/answers/400880-how-can-i-use-a-struct-cell-in-a-function#answer_320308

编辑：James Tursa 2018-5-15

The variable name you are using as the input argument in your function is "Input", not "data". There is no "data" variable in your function. Try changing all of your "data" names to "Input" inside your function.