How do I remove elements of an array from another array?
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Loren99
am 12 Jul. 2022
Bearbeitet: Dyuman Joshi
am 17 Sep. 2022
Hi everyone! I would like to understand how to remove elements in an array. I post my code and then I explain my problem.
This is my code:
for k = 1:size(allpoint_i,1)
countP = ismember(Pp, allpoint_i(k,:),'rows');
sumP(k) = sum(countP); %it counts how many times the point is first point of a segment
countS = ismember(Sp, allpoint_i(k,:),'rows');
sumS(k) = sum(countS); %it counts how many times the point is end point of a segment
if ((sumP(k)+sumS(k))<=2)
%insert condition to remove that point both from Pp and Sp
end
end
I explain my problem. Let's start from the first element of allpoint_i. For the first element of allpoint_i I have sumP(1) = 1 and sumS(1)=1. So for the if statement, I have to remove that point from Pp and Sp. In Pp it occupies the 4th row, in Sp it occupies the first row and in addition, I would like to remove not only the 4th row of Pp and the first row of Sp, but also the 4th row of Sp and the first row of Pp. How can I do it? I attach a zip file containing the variables Pp, Sp, allpoint_i. Thanks in advance
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Dyuman Joshi
am 12 Jul. 2022
Bearbeitet: Dyuman Joshi
am 17 Sep. 2022
Try this -
r1=[];r2=[];
for k = 1:size(allpoint_i,1)
countP = ismember(Pp, allpoint_i(k,:),'rows');
sumP(k) = sum(countP); %it counts how many times the point is first point of a segment
countS = ismember(Sp, allpoint_i(k,:),'rows');
sumS(k) = sum(countS); %it counts how many times the point is end point of a segment
if ((sumP(k)+sumS(k))<=2)
%insert condition to remove that point both from Pp and Sp
r1=[r1 find(sum(Pp==allpoint_i(k,:),2))'];
r2=[r2 find(sum(Sp==allpoint_i(k,:),2))'];
end
end
Pp([r1 r2],:)=[];
Sp([r1 r2],:)=[];
4 Kommentare
Dyuman Joshi
am 12 Jul. 2022
I think you skipped over my last 2 lines of code.
%Deleting the rows
Pp([r1 r2],:)=[];
Sp([r1 r2],:)=[];
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