nested loop in eval command and generalized the programme

hi all

i want to generalized the following program. the theme is...actually i want to pair in the following manner, gudx1-gudx2, 1-3, 1-4, 1-5, 2-3, 2-4, 2-5, 3-4, 3-5, 4-5, 5-1, 5-2, 5-3, 5-4

pair with itself and decreasing one is not allowed except the final variable, who can pair with all variable below him except himself.

and 2nd main point is changing of any variable chx1,chx2,chx3,chx4,chx5 is allowed only one time, means we cannot change a value of above variable twice or thrice.

chx1=genx1
chx2=genx2
chx3=genx3
chx4=genx4
chx5=genx5

if ((gudx1>0) & (gudx2>0))
    if (chx1==genx1)
        chx1= gudx2;
    end
end

if ((gudx1>0) & (gudx3>0))
    if (chx1==genx1)
        chx1= gudx3;
    end
end

if ((gudx1>0) & (gudx4>0))
    if (chx1==genx1)
        chx1= gudx4;
    end
end

if ((gudx1>0) & (gudx5>0))
    if (chx1==genx1)
        chx1= gudx5;
    end
end

if ((gudx2>0) & (gudx3>0))
    if (chx2==genx2)
        chx2= gudx3;
    end
end

if ((gudx2>0) & (gudx4>0))
    if (chx2==genx2)
        chx2= gudx4;
    end
end

if ((gudx2>0) & (gudx5>0))
    if (chx2==genx2)
        chx2= gudx5;
    end
end

if ((gudx3>0) & (gudx4>0))
    if (chx3==genx3)
        chx3=gudx4;
    end
end

if ((gudx3>0) & (gudx5>0))
    if (chx3==genx3)
        chx3=gudx5;
    end
end

if ((gudx4>0) & (gudx5>0))
    if (chx4==genx4)
        chx4= gudx5;
    end
end

if ((gudx5>0) & (gudx1>0))
    if (chx5==genx5)
        chx5= gudx1;
    end
end

if ((gudx5>0) & (gudx2>0))
    if (chx5==genx5)
        chx5= gudx2;
    end
end

if ((gudx5>0) & (gudx3>0))
    if (chx5==genx5)
        chx5= gudx3;
    end
end

if ((gudx5>0) & (gudx4>0))
    if (chx5==genx5)
        chx5= gudx4;
    end
end

i have tried but i know this one is logically and syntax wise is wrong.

for i:1:numChromosomes
    for j=i+1:numChromosomes
         eval(sprintf('if ((gudx%d>0) & (gudx%d>0))',[i j],'if(chx%d==gen%d)',[i i],'chx%d==gud%d',[i j],end,end))
    end
end

kindly help me too generalize it i will be highly thankful to you

regards

Answer 1

[Geoff Hayes]

Mudasir - you should consider using matrices to manage your chromosome data, rather than creating individual variables. If we assume that your gudx, genx, and chx variables are integers, then we could do something like the following

 chx  = [chx1  ; chx2  ; chx3  ; chx4  ; chx5];
 gudx = [gudx1 ; gudx2 ; gudx3 ; gudx4 ; gudx5];
 genx = [genx1 ; genx2 ; genx3 ; genx4 ; genx5];

 for u=1:length(gudx)

    % handle the case where if u is last element, then we compare
    % against all elements
    if u==length(gudx)
        strtId = 1;
        stopId = u-1;
    else
        strtId = u+1;
        stopId = length(gudx);
    end

    for v=strtId:stopId

        if gudx(u)>0 && gudx(v)>0

            if chx(u)==genx(u)
               chx(u) = gudx(v);

               % since chx(u) has changed, then exit the inner
               % for loop
               break;
            end
        end
     end
 end

The above code runs, but you should ensure that all conditions that you require are met.

[Mudasir Ahmed]

Thanks sir