How to use 'find' function in matlab

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Atinesh Singh 2017-3-28

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/332251-how-to-use-find-function-in-matlab

评论： KSSV 2017-3-28

In the below code, We have a random population with structures Position (3D array) and Cost. I need to check whether a particular element present in the population If it does then I want to remove it from the population. I'm using 'find' function for doing it. It was working fine with arrays but with structures I'm getting error below error

_ Undefined operator '~=' for input arguments of type 'struct'_

Here is the code

clc; clear all;
varMin   = -5;           
varMax   =  5; 
D        =  3;
VarSize  = [1 D]; % Decision Variables Matrix Size
NP      = 3;
empty_individual.Position   = [];
empty_individual.Cost       = [];
P  = repmat(empty_individual, NP, 1);
addpath('E:\Dimensionality Reduction\DR & Optimization\Data\Objective Functions');
CostFunction = @(x) sphere(x);
%%Generating random population
for i = 1:NP
    P(i).Position = unifrnd(varMin, varMax, VarSize);
    P(i).Cost     = CostFunction(P(i).Position);
end
xi = [1 1 1];                % xig
P  = P(find(P ~= xi));

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KSSV 2017-3-28

You have to mention what you are expecting actually?

Atinesh Singh 2017-3-28

I need to check whether a particular element present in the population If it does then I want to remove it from the population

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采纳的回答

KSSV 2017-3-28

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/332251-how-to-use-find-function-in-matlab#answer_260650

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idx = 1:length(P) ;
P  = P(find(idx ~= xi));

6 个评论
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Atinesh Singh 2017-3-28

is there any other way to do it

KSSV 2017-3-28

Define xi as a structure..And try using ismemeber etc.

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