How to create a series of variables of data?

2 次查看（过去 30 天）
Marlon Saveri Silva
编辑： Stephen23 2015-7-17
Hi, I need to create a lot of variables like these:
K01 = importdata('20150715-PowerDensity_60x60_Mesh300_28m_vs_K-1.dta', DELIMITER, HEADERLINES);
K02 = importdata('20150715-PowerDensity_60x60_Mesh300_28m_vs_K-2.dta', DELIMITER, HEADERLINES);
K03 = importdata('20150715-PowerDensity_60x60_Mesh300_28m_vs_K-3.dta', DELIMITER, HEADERLINES);
...
Kn = importdata('20150715-PowerDensity_60x60_Mesh300_28m_vs_K-n.dta', DELIMITER, HEADERLINES);
I tried the code below (considering http://www.mathworks.com/matlabcentral/answers/57445-faq-how-can-i-create-variables-a1-a2-a10-in-a-loop), but it's not working:
NumFiles=30; %Number of files used = number of points
FileNamePattern='20150715-PowerDensity_60x60_Mesh300_28m_vs_K-';
%%Import Files and save in a variable named "Data"
DELIMITER = ' ';
HEADERLINES = 9;
Data=1:i;
for i=1:1:numel(Data)
FileName=strcat(FileNamePattern, num2str(i), '.dta');
Data{i}=importdata(FileName, DELIMITER, HEADERLINES);
end
It's strange, because this is ok:
i=1
FileName=strcat(FileNamePattern, num2str(i), '.dta');
Test=importdata(FileName, DELIMITER, HEADERLINES);
These data have three parts:
Test.data: [90000x3 double]
Test.textdata: {9x3 cell}
Test.colheaders:{'theta_x' 'theta_y' 'P.Density'}
  2 个评论
Stephen23
Stephen23 2015-7-16
编辑：Stephen23 2015-7-17
The first sentence of that page that you linked states "Please don't do this!". Dynamically named variables are a really bad idea and will make your own life miserable. Do yourself a favor and learn to code using more reliable, faster and much less buggy methods. In particular you could put all of these arrays into one cell array or structure... see dpb's for more information on how to do this.
dpb
dpb 2015-7-16
编辑：Stephen23 2015-7-17
Well, in actuality he did, Stephen. I had just come back as I had intended to compliment him on that step in the right direction but forgot to do so. His problem (and appears superficially to be the only one to my eye) is the use of the curlies to try to reference a structure array instead of a cell array.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

dpb
dpb 2015-7-16
What error(s), specifically are you getting (iow, what precisely what does "not working" mean?
It's somewhat simpler imo to use the dir solution instead for the filenames but whether there's where the problem lies or not isn't discernible w/o the error...
fileMask=[FileNamePattern '*.dta'];
d=dir(fileMask);
for i=1:length(d)
Data(i)=importdata(d(i).name, DELIMITER, HEADERLINES);
end
OK, I see I missed the problem initially; still it would be good to know the error but several things show up --
  1. Don't assign the vector 1:i to Data initially; it's going to become a structure and that reassignment triggers at least a warning and may error if have later version. Also, at that point i isn't defined in the code you've posted
  2. Don't use {} "curlies" for structure array indices; they're reserved for cell array content addressing
Those should resolve the problem I believe...

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 MATLAB 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by