Length/Index based if else statements

Question

Fawad Farooq Ashraf 2022-5-1

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1709175-length-index-based-if-else-statements

评论： Fawad Farooq Ashraf 2022-7-30

采纳的回答： Voss

在 MATLAB Online 中打开

I have a vector of variable length, for example

b = [0.25;0.5;0.75;1;1.5;1.75;2.0];

and based on the length of this vector, I have some specific parameter K against each element of b, x is the input and my final output is m

if x < b(1)
    m = K(1);
elseif x < b(2)
    m = K(2);
elseif x < b(3)
    m = K(3);
elseif x < b(4)
    m = K(4);
elseif x < b(5)
    m = K(5);
elseif x < b(6)
    m = K(6);
else
    m = K(7);
end

I want to generalize my code based on the length of b. Here, the length was 7 so I had to run it manually like this for 7 elements. How can I generalize this for any length of b?

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Answer 1

Voss 2022-5-1

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https://ww2.mathworks.cn/matlabcentral/answers/1709175-length-index-based-if-else-statements#answer_954880

编辑：Voss 2022-5-1

在 MATLAB Online 中打开

idx = find(x < b,1);
if isempty(idx)
    idx = numel(b);
end
m = K(idx);

The above assumes b is sorted in ascending order, as in the example. If b is not necessarily sorted, you'd have to sort it first.

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Joe Jones 2022-7-27

Dear

Have you solved this problem? I met the error recently.

compilation of model failed while trying to resolve underspecified signal dimensions

@Fawad Farooq Ashraf

Fawad Farooq Ashraf 2022-7-30

@Joe Jones I guess you have to use the "Ports and Data Manager" for that. In the editor window for MATLAB Function, click on "Edit Data" and then try to specify the type and size. That should work for you.

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