Ordering vectors of numbers of type double and strings according to another vector

Question

L'O.G. 2022-12-7

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1873287-ordering-vectors-of-numbers-of-type-double-and-strings-according-to-another-vector

回答： Eric Delgado 2022-12-7

How do I order the following arrays?

vector_1 = [1 3 7 8 9 10];
string_1 = {'apples' 'pears' 'plums' 'oranges' 'peaches' 'grapes'};

Specifically, I want to re-order them according to [3 1 7 9 8 10] for vector_1.

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Answer 1

Voss 2022-12-7

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https://ww2.mathworks.cn/matlabcentral/answers/1873287-ordering-vectors-of-numbers-of-type-double-and-strings-according-to-another-vector#answer_1122507

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vector_1 = [1 3 7 8 9 10];
string_1 = {'apples' 'pears' 'plums' 'oranges' 'peaches' 'grapes'};
vector_1_reordered = [3 1 7 9 8 10];
[~,idx] = ismember(vector_1_reordered,vector_1);
string_1_reordered = string_1(idx)
string_1_reordered = 1×6 cell array
    {'pears'}    {'apples'}    {'plums'}    {'peaches'}    {'oranges'}    {'grapes'}

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Answer 2

Eric Delgado 2022-12-7

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https://ww2.mathworks.cn/matlabcentral/answers/1873287-ordering-vectors-of-numbers-of-type-double-and-strings-according-to-another-vector#answer_1122512

在 MATLAB Online 中打开

You could write a simple loop...

string_1 = {'apples' 'pears' 'plums' 'oranges' 'peaches' 'grapes'};
vector_1 = [1 3 7 8 9 10];
vector_2 = [3 1 7 9 8 10];
idx = [];
for ii = 1:numel(vector_1)
    idx(ii) = find(vector_1 == vector_2(ii), 1);
end
string_2 = string_1(idx)
string_2 = 1×6 cell array
    {'pears'}    {'apples'}    {'plums'}    {'peaches'}    {'oranges'}    {'grapes'}