Copying from one array to another

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R J 2014-9-20

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评论： Star Strider 2014-9-21

Hi,

I have a data.txt file that I import using txt2mat. The relevant data are in chunks of length 1250 or 1500 points, but when I try to copy them to an array I get a "Subscripted assignment dimension mismatch" error.

For example: A = [1;2;3;4;5] and B = [1;2;3;4;5;6] If I want to copy the contents of A and B to temp(1,:) and temp(2,:), respectively, I get the error. Is it possible for me to store the contents of A and B, although they are different lengths, in the same temp array?

Any help in handling this would be appreciated.. Thanks!

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Azzi Abdelmalek 2014-9-20

You know they are different sizes, then what do you want?

John 2014-9-20

When you do an assignment like that, the rows have to be the same size. Consider using a cell. Or preallocating temp to be big enough to hold the biggest row and then storing the rows A and B after padding them with NaNs

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Answer 1

Star Strider 2014-9-20

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As a cell array: yes. As a numeric array: no, unless you preallocate an array with a row length the size of the longest row vector.

Example:

A = [1;2;3;4;5]; 
B = [1;2;3;4;5;6];
% Cell Array:
tempc = {A B};
% Numeric Array
tempn = nan(max(size(A,1),size(B,1)),2);    % Preallocate NaN Matrix
tempn(1:size(A,1),1) = A;
tempn(:,2) = B;