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POMATLAB: Ignoring Specific Columns in a Matrix when Carrying Out a Loop
 

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    <p>so far I have this:</p> <pre><code>for l=1:50 %# matrix of distances between terminal nodes, index of column represents %# where the searcher is going from and the index of the row represents %# where the searcher is going to d = [ 10 2 2 3 3 2 4 5 5 4 4 4 3 3 4 4; 10 10 2 5 5 4 6 7 7 6 6 6 5 5 6 6; 10 2 10 5 5 4 6 7 7 6 6 6 5 5 6 6; 10 5 5 10 2 3 7 8 8 7 7 7 6 6 7 7; 10 5 5 2 10 3 7 8 8 7 7 7 6 6 7 7; 10 4 4 3 3 10 6 7 7 6 6 6 5 5 6 6; 10 6 6 7 7 6 10 3 3 2 4 4 5 5 6 6; 10 7 7 8 8 7 3 10 2 3 5 5 6 6 7 7; 10 7 7 8 8 7 3 2 10 3 5 5 6 6 7 7; 10 6 6 7 7 6 2 3 3 10 4 4 5 5 6 6; 10 6 6 7 7 6 4 5 5 4 10 2 5 5 6 6; 10 6 6 7 7 6 4 5 5 4 2 10 5 5 6 6; 10 5 5 6 6 5 5 6 6 5 5 5 10 2 3 3; 10 5 5 6 6 5 5 6 6 5 5 5 2 10 3 3; 10 6 6 7 7 6 6 7 7 6 6 6 3 3 10 2; 10 6 6 7 7 6 6 7 7 6 6 6 3 3 2 10 ]; i=1; %# start the searcher at the origin h=5; t=0; %# start time of the game k=find(d(i,:)==min(d(i,:))); %# position closest nodes j=randsample(k,1,true); %# randomly selects closest node if multiple nodes within closest distance c=min(d(i,:)); while j~=h %# while the searcher is not in the same position as the hider d(:,j)=[]; %# delete the column corresponding to the searchers position so he cannot return here %# want to ignore all previous positions not delete them! i=j; %# reset the searchers current position k=find(d(i,:)==min(d(i,:))) %# find the new minimum distance p=rand(1)*length(k); %# randomly select an index of k q=floor(p)+1 %# take the integer part of k j=k(q) %# randomly select from all the closest nodes t=t+min(d(i,:))+c; %# calculate cumulative time for paths traveled end Found(l)=j-1 %# show position where the hider was found (relate matrix index to node index) Time(l)=t %# show time taken for the searcher to find the hider end </code></pre> <p>So the elements in <code>d</code> are the distance between two positions, represented by the row and column position, then the aim is to reach column 5 (<code>h</code>) by traveling the shortest distances between positions.</p> <p>The problem I have is that I am currently deleting each column as it is searched for the minimum distance, this is then redefining the index of the column and so when <code>h</code> is either not being reached or it is not the correct <code>h</code>. How can I ignore rows already searched in the 'while' loop?</p> <p>Any help will be gratefully received, thank you.</p>
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