value of variable is changed in iteration

Question

summyia qamar 2016-12-15

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https://ww2.mathworks.cn/matlabcentral/answers/317001-value-of-variable-is-changed-in-iteration

评论： summyia qamar 2016-12-15

采纳的回答： José-Luis

在 MATLAB Online 中打开

a=[2 2.8];b=[2.8 3];c=[2.5 3];d=[2 2.8];e=[2.5 3];f=[2.8,3];g=[2.5 3];

m=[];

for z=a;

    for y=b;
         for x=c;
            for w=d;
                for v=e;
                    for u=f;
                        for t=g;
f=48*z+33*y+10*x+37*w+30*v+45*u+64*t;
m=[m;z y x w v u t f]
                        end
                    end
                end
            end
        end
    end
end
the 5th iteration shown is result is 
m =
            2          2.8          2.5            2          2.5          2.8          2.5        648.4
            2          2.8          2.5            2          2.5          2.8            3        680.4
            2          2.8          2.5            2          2.5            3          2.5        657.4
            2          2.8          2.5            2          2.5            3            3        689.4
            2          2.8          2.5            2            3        689.4          2.5        31560
and so on the values of 6th colume are changed while I have given the values f=[2.8 3]..why it is selecting 689.4 in next iteration?

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José-Luis 2016-12-15

Please look at my answer that does what you want, in a simpler way.

Please accept the answer that best solves your problem.

summyia qamar 2016-12-15

but there's no option for answer acceptance here

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Answer 1

José-Luis 2016-12-15

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https://ww2.mathworks.cn/matlabcentral/answers/317001-value-of-variable-is-changed-in-iteration#answer_247317

编辑：José-Luis 2016-12-15

在 MATLAB Online 中打开

Is this what you are trying to do?

a=[2 2.8];
b=[2.8 3];
c=[2.5 3];
d=[2 2.8];
e=[2.5 3];
f=[2.8,3];
g=[2.5 3];
[A,B,C,D,E,F,G] = ndgrid(a,b,c,d,e,f,g);
result = [A(:),B(:),C(:),D(:),E(:),F(:),G(:)];
temp_var = (48 .* A) + (33 .* B) + (10 .* C) + (37 .* D) + (30 .* E) + (45 .*F) + (64 .* G);  
result = [result, temp_var(:)];

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summyia qamar 2016-12-15

oh thanks alot.its done..I want to represent the vales 2, 2.5,2.8,3 as W1,W2,W3,W4 in the final matrix..how is it possible. I tried (==)method but its not working

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Answer 2

Adam 2016-12-15

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https://ww2.mathworks.cn/matlabcentral/answers/317001-value-of-variable-is-changed-in-iteration#answer_247316

Why would you ever choose to do this in 7 nested for loops?!

You could do this far quicker just using the original a, b, c etc rather than z, y, x in a loop.

What is the final result you are trying to achieve?

As far as your bug goes though you are reassigning f in your loop which is also used as one of your original variables. Rename this and it will probably do what you want.