Picking up the correct index values

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Ganesh Kini 2020-5-27

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https://ww2.mathworks.cn/matlabcentral/answers/535448-picking-up-the-correct-index-values

评论： Ganesh Kini 2020-5-28

采纳的回答： Rik

I have 4 arrays, two combinations of Nwell and Pwell voltages of Transistor 1 and Transistor 2

For transistor 1

vnw_1 =

0.00000 0.90000

vpw_1 =

-1.8000 -1.2000

So we define as (Vn, Vp) as (0.00000, -1.8000) and another (0.90000, -1.2000) these are the combination respectively.

for transistor 2

vnw_2 =

0.90000 0.00000

vpw_2 =

-1.20000 0.20000

Similarly we have (Vn, Vp) as (0.90000, -1.2000) and another (0.00000, 0.20000)

we can see that (0.90000, -1.2000) is common in T1 and T2.

I want to get the common voltage as the output

Answer (0.90000, -1.2000)

How do i do that? There is nothing linked to the concepts of transistors, just i need that combination as the output. How do i do that? Please help me

采纳的回答

Rik 2020-5-27

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You should probably rethink the way you store these values, because this is much more difficult to index than it needs to be.

vnw_1 = [ 0.00000  0.90000];
vpw_1 = [-1.80000 -1.20000];
vnw_2 = [ 0.90000  0.00000];
vpw_2 = [-1.20000  0.20000];
Answer=[];
for T1_ind=1:2
    T1=[vnw_1(T1_ind) vpw_1(T1_ind)];
    for T2_ind=1:2
        T2=[vnw_2(T2_ind) vpw_2(T2_ind)];
        if isequal(T1,T2)
            Answer=T1;
        end
    end
end

First convert your four vectors to two arrays so you can compare them. Make sure the things you want to compare are on the rows of your array. Then you can use ismembertol. You could also try with ismember first, but if your decimal values can't be expressed as a binary fraction you may get rounding errors. (just like you can't store 1/3 in a decimal value, Matlab can't store every value without rounding)

VNW1=[-0.20000  -0.20000];
vpw1=[-0.90000  -1.80000];
VNW2=[1.20000   0.30000   0.90000  -0.20000   1.20000];
VPW2=[0.00000  -1.20000  -0.90000   -1.80000  -0.30000];
T1=[VNW1(:) vpw1(:)];
T2=[VNW2(:) VPW2(:)];
L=ismembertol(T1,T2,'rows');
matches=T1(L,:);