why does this not work ?

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Anne
Anne 2017-4-3
评论： Image Analyst 2017-4-3
for n=1:4 % size(PIDS,1);
BC = {n,4};
BC{n,1} = {PIDS{n,1}; FNS{n,1}; PPNameS{n,1}; APS{n,1}};
BC{n,2} = {PIDS{n,2}; FNS{n,2}; PPNameS{n,2}; APS{n,2}};
BC{n,3} = {PIDS{n,3}; FNS{n,3}; PPNameS{n,3}; APS{n,3}};
BC{n,4} = {PIDS{n,4}; FNS{n,4}; PPNameS{n,4}; APS{n,4}};
end
BC
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Anne
Anne 2017-4-3
'Index exceeds matrix dimensions' is the complete error message.
Jan
Jan 2017-4-3
编辑：Jan 2017-4-3
No, a complete error message should contain the failing line also. Are you running tis in the command window? If so, create a script or even better a function. Then debugging is easier und you (and the readers) do not have to guess, where the error occurres.
I've edited my answer.

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回答（1 个）

Jan
Jan 2017-4-3
编辑：Jan 2017-4-3
You overwrite BC in each iteration. Perhaps you want to move the pre-allocation before the loop:
BC = cell(4, 4); % Not: {4, 4};
for n = 1:4 % size(PIDS,1);
BC{n,1} = {PIDS{n,1}; FNS{n,1}; PPNameS{n,1}; APS{n,1}};
BC{n,2} = {PIDS{n,2}; FNS{n,2}; PPNameS{n,2}; APS{n,2}};
BC{n,3} = {PIDS{n,3}; FNS{n,3}; PPNameS{n,3}; APS{n,3}};
BC{n,4} = {PIDS{n,4}; FNS{n,4}; PPNameS{n,4}; APS{n,4}};
end
"BC = {n,4}" means, that BC is set to a [1 x 2] cell array. Is this intented? Afterwards the elements {n, 1:4} are added. But the values from the former itereations are overwritten.
To get the reason of the error message, write the code in a script or better a function. Then typ this in the command window:
dbstop if error
Now run your code again until it stops at the error. Inspect the variables and the indices: At least one of the arrays has less elements than you request.
  1 个评论
Image Analyst
Image Analyst 2017-4-3
Anne, read this and this before you respond again. Also post some sample data for PIDS, FNS, PPNameS, and APS so we can try things to help you.

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