Adding 2 different length array
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I have problem in adding 2 different length array e.g x=[1 2 3 4 5 6 ]', Y =[ 3 5 7 8 ]' Ans= 4 7 10 13 6 but I do not know how to get this answer ? in my code I have tried
dir_list=dir('v1_ch.txt');
vec1=[];
for j=1:12
data=dlmread(dir_list((j-1)*13+k).name,';',3 );
latitude=data(:,1);
longitude=data(:,2);
ch4=data(:,3);
vec1=vec1+ch4; % here I tried to add array together
end
but it does not work ?
1 个评论
Jan
2011-10-23
Please edit your question and use the standard code formatting as explained in the "Markup help" link.
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the cyclist
2011-10-23
Arrays have to be the same size (or one has to be a scalar) to add them, otherwise it is ambiguous to MATLAB what should be done with the "leftover" elements.
In your case, you want to pad a zero onto the end of Y, so the addition could be done like this:
x = [1 2 3 4 5 6]';
y = [3 5 7 8]';
A = x + [y;zeros(2,1)];
This will result in A = [4 7 10 12 5 6]'. (This is not exactly what you wrote as your answer, but I am guessing it is what you meant.)
If you don't know ahead of time how many zeros you need to pad at the end, then you can use the size() or length() command to determine the array dimensions, to calculate how many zeros you need.
Finally, you might want to read the "Getting Started" guide. The basics of vector manipulation are covered there.
更多回答（1 个）
Azmat Ameen
2020-12-17
编辑：Azmat Ameen
2020-12-17
function[t,x]=padding(t1,t2,x1,x2)
t=min(min(t1),min(t2)):max(max(t1),max(t2));
y1=zeros(1,length(t));
y2=y1;
y1((t>=min(t1))&(t<=max(t1)))=x1;
y2((t>=min(t2))&(t<=max(t2)))=x2;
x=(y1+y2)
stem(t,x)
end
Use this function to pad zeros and you will get the addition of two different array with different length.
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