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slow down the for loop operation for huge set of datas

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SatyaPrakash Gupta 2020-4-2

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评论： darova 2020-4-3

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Hello Team,

I would like to increase the search operation in quite faster way, the below code i have implemented takes atleast 40mins to complete it because i have very huge data

for i = 1:length(LocationsListData.x) % which is approximately 26532957
    idx = inpolygon(X(:),Y(:),LocationsListData.x(i),LocationsListData.y(i)) ;% X and Y has 4196*4196 size for each element
    idx(idx==0)=[];
    if~isempty(idx)
        value(i) = idx;
    end
end  

do you see any possiblities to reduce the speed ? if so and then how can i do that ?

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SatyaPrakash Gupta 2020-4-3

Hii Darova,

please find the locationListdata attaced in the below link.

there is no polygon available , i have grid where i use to search for available data in each grid using inpolygon function

https://drive.google.com/drive/folders/1q0cvqyjwUiTGgBHoSfRQlaHDLeosWw_G

darova 2020-4-3

You have there some military data or what?

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回答（1 个）

Mohammad Sami 2020-4-3

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https://ww2.mathworks.cn/matlabcentral/answers/514747-slow-down-the-for-loop-operation-for-huge-set-of-datas#answer_423708

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You don't need to use the for loop with the inpolygon function.

idx = inpolygon(X(:),Y(:),LocationsListData.x,LocationsListData.y);

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SatyaPrakash Gupta 2020-4-3

this will also slow down and take much time.

anyway i dont need this logic anymore,thank you

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MATLAB Language Fundamentals Loops and Conditional Statements

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