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From: Guangping Zhang on 8 Mar 2010 14:07
Dear All:
I'm a new Matlab user, I hope I can get help.
I have two matrix in structure S, S. T1 and S.M1, S.T1 is 20000X2, S.M1 is 94X2 matrix. S.M1 was extracted from S.T1, now I need get index from S.T1 to using the loop below and it works fine:

for i=1:length(S.M1)
ind(i)=val2ind(S.T1(:,1), S.M1(i,1));
end


Actually I have 30 pairs of matrix, M1,M2,M3…M30 and T1,T2,T3… in the structure S, I need get the index of M1 from T1, index of M2 from T2,…, so I use another for loop to try get all the index, unfortunately, I got error:

for j=1:3
for i=1:length(S.(sprintf('M%j',j)))
S.(sprintf('ind%j',j))(i)=val2ind(S.(sprintf('T%j',j))(:,1), S.(sprintf('M%j',j))(:,1));
end
end

??? Reference to non-existent field 'T'.

Finally, I realize that the serial M file has different length, so maybe the' for loop' is the error source, I try to write it for a while but cannot figure it out. May someone help me? I will really appreciate it.
From: Walter Roberson on 8 Mar 2010 14:30
Guangping Zhang wrote:
> Dear All:
> I'm a new Matlab user, I hope I can get help.
> I have two matrix in structure S, S. T1 and S.M1, S.T1 is 20000X2, S.M1
> is 94X2 matrix. S.M1 was extracted from S.T1, now I need get index from
> S.T1 to using the loop below and it works fine:
>
> for i=1:length(S.M1)
> ind(i)=val2ind(S.T1(:,1), S.M1(i,1));
> end
>
> Actually I have 30 pairs of matrix, M1,M2,M3…M30 and
> T1,T2,T3… in the structure S, I need get the index of M1 from T1,
> index of M2 from T2,…, so I use another for loop to try get all
> the index, unfortunately, I got error:
>
> for j=1:3
> for i=1:length(S.(sprintf('M%j',j)))
> S.(sprintf('ind%j',j))(i)=val2ind(S.(sprintf('T%j',j))(:,1),
> S.(sprintf('M%j',j))(:,1));

Those should be %d formats, not %j. As in

sprintf('ind%d', j)

> end
> end
> ??? Reference to non-existent field 'T'.
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