Loop problem

2011 5 30
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Hello, I have a loop problem in Matlab
Consider the following datasets:
models = 5x10 (5 rows, 10 columns)
bsdata = 5x20 (5 rows, 20 columns)
I want to do the following calculation:
Result=models(bsdata);
If I do so, I obtain a 5x20 dataset. How can I do this for all the 10 columns of models? I would like to obtain a 10x200 dataset? I have tried the following, but it doesn’t work:
for i=1:10
Result=models(:,i)(bsdata);
end
Thanks,
Pieter

6 个评论
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Fangjun Jiang
Fangjun Jiang 2011-5-30
what do you mean by Result=models(bsdata) since models and bsdata are matrix. What operation do you want to do to obtain the results?
Charles
Charles 2011-5-30
Hi,
your question is confusing and maybe you should frame it better.
models = ones(5, 10); %gives a 5 x 10 matrix
bsdata =zeros(5, 20): % 5 x 20 matrix
Result=models(bsdata); %Are not possible, bsdata is larger than models
Result=bsdata(models);%Possible. References bsdata indexed by models.
for i=1:10
Result=models(:,i)(bsdata);
end
This part is not really clear. I think it is better you rather clarify what you mean with words.
Pieter
Pieter 2011-5-30
I try to explain it: bsdata is a dataset that picks random numbers from models. So if bsdata has the number 3, this means that it takes the third element from models. So if I do Results=models(bsdata), results will take the third number from models.
A short example:
models = [3;8;7;6]
bsdata = [2;2;1;4, 3;4;2;1]
If you do: result=models(bsdata);
result = [8;8;3;6, 7;6;8;3]
I hope this makes it more clear.
The problem I have is that he only does this calculation for the first column of models, and not for column 2-10.
Pieter
Pieter 2011-5-30
@ Charles, you are right, my example is not correct. Instead of models being a 5x10 matrix, make it a 5x30 matrix, than it should work (I think)
Oleg Komarov
Oleg Komarov 2011-5-30
Still not clear why you have a matrix for bsdata instead of a vector. How are you gonna draw a 5 by 20 matrix from a 5 by 30?
Pieter
Pieter 2011-5-30
You are right, it are vectors. I was using the wrong word.

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 采纳的回答

Oleg Komarov
Oleg Komarov 2011-5-30

0 个投票

Then:
Result = models(bsdata,:);
You will draw rows direclty fro models.

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