How can i return a value based on mutliple fields?

Question

Emma Kuttler 2019-11-10

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https://ww2.mathworks.cn/matlabcentral/answers/490324-how-can-i-return-a-value-based-on-mutliple-fields

评论： Emma Kuttler 2019-11-11

采纳的回答： Shubham Gupta

I have a structure named N2, with three fields - Components, PowerConsequences, and ICTConsequences.

>>N2 =

struct with fields:

Components: [43660×2 double]

PowerConsequences: [43660×1 double]

ICTConsequences: [43660×1 double]

>> fieldnames(N2)

ans =

3×1 cell array

{'Components' }

{'PowerConsequences'}

{'ICTConsequences' }

The components field is a vector with two columns, so N2.Components returns a list like this. It describes the combination of 2 components in a system, and the other fields describe effects.

290 296

291 292

291 293

291 294

291 295

291 296

292 293

And so on. How do i return a value in the field PowerConsequences or ICTConsequences based on two specific values in the field Components - ie for the values (290,296) in the Components field, how do i return the value in the PowerConsequences Field?

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Answer 1

Shubham Gupta 2019-11-11

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https://ww2.mathworks.cn/matlabcentral/answers/490324-how-can-i-return-a-value-based-on-mutliple-fields#answer_400822

编辑：Shubham Gupta 2019-11-11

在 MATLAB Online 中打开

Try:

id = find(N2.Components(:,1) == 290 & N2.Components(:,2) == 296);
PowerConsequences_out = N2.PowerConsequences(id);
ICTConsequences_out = N2.ICTConsequences(id);

I hope it helps.

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Emma Kuttler 2019-11-11

What if i wanted to return the average of everything with a specific value in the components field? Like the value in the field PowerConsequences for all combinations of components that contain component 1? Would it be something like this?

>> mean(id = find(N2.Components(:,1)=1)

My end goal is to take the average of all PowerConsequences for all combinations that include Component 1, Component 2, etc

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