Creating a for loop that Concatinates the outputted matrixes

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James
James 2014-4-9
编辑： Joseph Cheng 2014-4-9
Hi,
I have a file that is a master file, it just contains other file names. I am trying to get matlab to loop through this file and get the data that I need from each of the files listed in the "master file". Here is my code so far,
[num txt raw]=xlsread('vehicle master file');
for(x=1:length(txt))
x;
filename=txt{x};
[num1 txt1 raw1 = xlsread(filename);
txtrow7=txt1(32:end,7);
index1 = find(ismember(txtrow7,'response delay','legacy'));
num5=num1(32:end,5);
DR=num1(index1,5);
%remove NaN
DR1=Snip(DR,nan);
%find and remove 10's
values10=find(DR1==10);
DR1(values10)=[];
end
contained in the for loop is all the code that I want to do. The "DR1" is a 300x1 matrix. I do not know how do get this script to loop back through and create another final matrix and concatinate them together so after the second file I will have a matrix "DR2" that is 600x1. And so on depending on how many times the loop runs. How would I do this?
Thanks.

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回答（1 个）

Joseph Cheng
Joseph Cheng 2014-4-9
编辑：Joseph Cheng 2014-4-9
If the resulting DR1 length for each iteration is variable and you are not concerned about time, you can insert your DR2=[] before the for loop and at end of the for loop you do DR2 = [DR2;DR1]; which will set DR2 as DR2 appended with DR1;
[num txt raw]=xlsread('vehicle master file');
DR2=[]; %creates empty array;
for(x=1:length(txt))
%%stuff done to get DR1
DR1(values10)=[];
DR2=[DR2;DR1]%append DR2 with DR1;
end
Iteration 1: DR2 is empty so DR2 will be DR1.
Iteration 2: DR2 already has the stuff from previous iteration and then you concatenate old stuff with new.
  1 个评论
Joseph Cheng
Joseph Cheng 2014-4-9
编辑：Joseph Cheng 2014-4-9
Preallocating the DR2 can be performed as such.
[num txt raw]=xlsread('vehicle master file');
DR2=zeros(300*length(txt),1);
for(x=1:length(txt))
%%stuff done to get DR1
DR1(values10)=[];
DR2((i-1)*300+1:i*300) = DR1; %if DR1 is always 300 long
end
for different length DR1;
CurrentPos = 1;
DR2=zeros(300*length(txt),1); %pre allocation something representative to your data.
for(x=1:length(txt))
%%stuff done to get DR1
DR1(values10)=[];
DR2(Cpos:Cpos+length(DR1)-1) = DR1; %if DR1 is always 300 long
Cpos = Cpos+length(DR1);
end
DR2(Cpos:end)=[]; %clear out remaining allocated space.
Any of the methods should work.

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