choose a part of matrix with an condition

Question

Bashar AlHalaq 2022-2-1

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1640460-choose-a-part-of-matrix-with-an-condition

评论： Arif Hoq 2022-2-2

i have the following code:

clc; clear all; close all;

lamda=1;

n=100;m=10;

for i=1:n

u=rand;

t(i)=-log(1-u)./lamda;

end

aa=min(t);aaa=max(t);

alpha=(t-aa)./(aaa-aa);

cut=alpha';

x=t';

fs =sort([x cut]);

result the follwling fuzzy set

0.0251095217432329 0

0.0259813666329032 0.000157215256236631

0.0343724949438669 0.00167034379911478

0.0365119840971735 0.00205614675493619

0.0444796386769595 0.00349291248150910

0.0685101096620772 0.00782620237994602

0.0729419959197381 0.00862538138743353

0.0729823212975833 0.00863265305316889

0.0771056967721968 0.00937619991509561

0.0782934192059375 0.00959037572660854

0.0942481070214086 0.0124674016320231

0.118104923234842 0.0167693772683126

0.132928037723898 0.0194423524388193

0.141464614937633 0.0209817090261459

0.150486651883491 0.0226086060430634

0.160165769148197 0.0243539909377214

0.162624667685636 0.0247973913271754

0.174022001792908 0.0268526133320516

0.177437098264183 0.0274684399236455

0.186089797358388 0.0290287361659603

0.192389357916822 0.0301647031700760

0.193639507619337 0.0303901361664079

0.198540620337461 0.0312739283420046

0.230425224929311 0.0370235133201386

0.243585467389849 0.0393966314230066

0.246461893804786 0.0399153224438845

0.277901483165116 0.0455846601389507

0.291537135509796 0.0480435064345724

0.309915334323799 0.0513575514785294

0.319423270431970 0.0530720681651994

0.334011019687199 0.0557026011467529

0.357922356879197 0.0600144082676525

0.364889059485256 0.0612706775287480

0.365435326188982 0.0613691829633927

0.443159715125493 0.0753848179315693

0.449823839934316 0.0765865249115897

0.468569891981819 0.0799669030166767

0.513582634608457 0.0880838168734941

0.554022281661509 0.0953760881810300

0.581646474411458 0.100357415241576

0.588036425496520 0.101509681899418

0.601783323397470 0.103988588527837

0.613498559211000 0.106101136094633

0.638552105558661 0.110618911854234

0.638916426867956 0.110684608021834

0.651875003547725 0.113021360782915

0.687205861775114 0.119392390762089

0.691297023750098 0.120130128731106

0.705899157309337 0.122763255559417

0.823433299288465 0.143957576323044

0.858045642838051 0.150199040285924

0.888157505568769 0.155628955940717

0.889518685776218 0.155874410490757

0.893463294721270 0.156585721313814

0.915285437208968 0.160520794815401

0.937878900953337 0.164594956669108

0.955028908877928 0.167687528435336

0.978256016710709 0.171875952033193

0.992685558782281 0.174477956335836

1.08909370982563 0.191862736987945

1.11174608686031 0.195947522369003

1.11550892269812 0.196626054992669

1.11575884057759 0.196671121384552

1.25770274616163 0.222267127912803

1.28429691903436 0.227062716843958

1.29259304165275 0.228558713504230

1.35119807040169 0.239126653651248

1.37659600127880 0.243706530482590

1.37747485674277 0.243865009919242

1.45006245198353 0.256954353586431

1.52626623667126 0.270695785896039

1.52631887410864 0.270705277731460

1.53674879873361 0.272586051813950

1.55574556165166 0.276011639306878

1.56381957936798 0.277467584944880

1.59033309595797 0.282248629547901

1.75485836515092 0.311916615975340

1.77673375075387 0.315861290531090

1.94447021196261 0.346108334519763

1.97521587492537 0.351652540075276

2.05646098147899 0.366303047747151

2.08463410738727 0.371383361070237

2.18820048893875 0.390058948214269

2.21500819936291 0.394893043261894

2.23664670373312 0.398795002256487

2.38362299297179 0.425298472365837

2.42209071247778 0.432235156230854

2.57895632620045 0.460521916809850

2.68559900772363 0.479752237134110

2.70979097605743 0.484114649009811

2.76197414497776 0.493524568561156

2.76341068061933 0.493783611564858

2.85507329914818 0.510312655010629

2.90563229743653 0.519429696315966

2.97068170733797 0.531159718211906

3.03761808247567 0.543230006738578

3.11245164225496 0.556724353514239

3.61120264525975 0.646661528881897

5.47375984678937 0.982526785607316

5.57065841146458 1

with two columns first the element of the set and the second represent the degree of membership of the element

How can i selecet a set from the fuzzy set above which contian the elements have a degree of membership greater than 0.5

with my best regurads

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Answer 1

Arif Hoq 2022-2-1

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1640460-choose-a-part-of-matrix-with-an-condition#answer_886205

编辑：Arif Hoq 2022-2-1

在 MATLAB Online 中打开

Try this:

lamda=1;
n=100;m=10;
for i=1:n
    u=rand;
    t(i)=-log(1-u)./lamda;   
end
aa=min(t);aaa=max(t);
alpha=(t-aa)./(aaa-aa);
cut=alpha';
x=t';
fs =sort([x cut]);
element_of_set=fs(:,1);
degree_of_membership=fs(:,2);
greater_value=degree_of_membership(degree_of_membership>0.5) % expexted value greater than 0.5
greater_value = 7×1
    0.5102
    0.5625
    0.6472
    0.7921
    0.8183
    0.8215
    1.0000

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Arif Hoq 2022-2-1

编辑：Arif Hoq 2022-2-2

在 MATLAB Online 中打开

is that your answer ? if no, let me do it again.

lamda=1;
n=100;m=10;
for i=1:n
    u=rand;
    t(i)=-log(1-u)./lamda;   
end
aa=min(t);aaa=max(t);
alpha=(t-aa)./(aaa-aa);
cut=alpha';
x=t';
fs =sort([x cut]);
element_of_set=fs(:,1);
degree_of_membership=fs(:,2);
greatr_value_element_of_set=element_of_set(element_of_set>0.5)  % greater value than 0.5 of element of set
greatr_value_element_of_set = 66×1
    0.5058
    0.5063
    0.5217
    0.5509
    0.5833
    0.6188
    0.6228
    0.6246
    0.6251
    0.6628
greater_value_degree_of_membership=degree_of_membership(degree_of_membership>0.5) %greater value than 0.5 of degree of membership
greater_value_degree_of_membership = 7×1
    0.5025
    0.5201
    0.5396
    0.5577
    0.6691
    0.9690
    1.0000
greater_value_fs=fs(fs>0.5)  % greater value than 0.5 of Fuzzy set
greater_value_fs = 73×1
    0.5058
    0.5063
    0.5217
    0.5509
    0.5833
    0.6188
    0.6228
    0.6246
    0.6251
    0.6628

the last variable (greater_value_fs) is shown in 1 single column. first 60 data for 'element of set', rest of 7 for 'degree of membership'. as 'fs' is 2 column matrix you need to arrange it according to your expected outcome.

Arif Hoq 2022-2-2

编辑：Arif Hoq 2022-2-2

在 MATLAB Online 中打开

Try this one also.

lamda=1;
n=100;m=10;
for i=1:n
    u=rand;
    t(i)=-log(1-u)./lamda;   
end
aa=min(t);aaa=max(t);
alpha=(t-aa)./(aaa-aa);
cut=alpha';
x=t';
fs =sort([x cut]);
element_of_set=fs(:,1);
degree_of_membership=fs(:,2);
greatr_value_element_of_set=element_of_set(element_of_set>0.5);  % greater value than 0.5 of element of set
greater_value_degree_of_membership=degree_of_membership(degree_of_membership>0.5); %greater value than 0.5 of degree of membership
greater_value_from_fs=fs(fs>0.5);  % greater value than 0.5 of Fuzzy set
idx=find(degree_of_membership>0.5);
greater_value_degree_of_membership(idx)=greater_value_degree_of_membership;
%% fuzzy set  in which value of degree of membership >0.5
A=[element_of_set greater_value_degree_of_membership];  %  Make a matrix of fuzzy set 
indices = find(A(:,2)==0);
A(indices,:) = []
A = 18×2
    0.0244    0.5388
    0.0295    0.5755
    0.0456    0.5773
    0.0641    0.5791
    0.0718    0.5934
    0.0938    0.6832
    0.1094    0.8300
    0.1115    0.9298
    0.1146    1.0000
    2.7354    0.5388

Bashar AlHalaq 2022-2-2

thank you that is all right thank you Arif Hoq

Arif Hoq 2022-2-2

@Bashar AlHalaq If you find your answer, then please consider marking it as accepted answer. That will make it easier for others with similar issues to find an answer.

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