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for loop with multiple indices

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ba sa
ba sa on 5 Dec 2021
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Answered: Walter Roberson on 5 Dec 2021
我想写一个函数,经过each row of a matrix and at the same time go through each element of the first row, what i had in mind was something like this
functionX1= RREF_GEN (X,M,N)
form = 2:M , n = 1:N;
X1=X(m,:)-(X(m,n)/X(1,n))*X(1,:);
end
this doesn't work, and nesting doesn't either because i want the two loops to run at the same time not one after the other
please help

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Accepted Answer

Walter Roberson
Walter Roberson on 5 Dec 2021
That is not possible for the general case where N is not the same as (M-1) -- that is, if the two variables to be incremented do not have the same length.
If the two did have the same length then
m_vals = 2:M;
n_vals = 1:N;
foridx = 1 : length(m_vals)
m = m_vals(idx);
n = n_vals(idx);
X1=X(m,:)-(X(m,n)/X(1,n))*X(1,:);
end
or
form = 2 : M
n = m - 1;
X1=X(m,:)-(X(m,n)/X(1,n))*X(1,:);
end
or
form = 2 : M
X1=X(m,:)-(X(m,m-1)/X(1,m-1))*X(1,:);
end

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