CODEWITHSUNDEEP
matlabmatrix
Elad L.
Elad L.

Reputation: 639

How to add an element to the end of a matrix?

I am trying to add an element to the end of a matrix and i dont know the length of the matrix.

EvantCal = 999*ones(1,2);
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%// in a different function
EventCal(end + 1) = [1, 3]; 
%// the numbers are random
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this is the error I get when I run the code:

In an assignment A(I) = B, the number of elements in B and I must be the same.

Upvotes: 1

Views: 710

Answers (1)

Dan
Dan

Reputation: 45741

The error is becasue you a trying to stuff a 1-by-2 matrix (i.e. [1, 3], which is also the B from the error message) into a single element of EventCal (note that the I in the error message is your end+1 which is a single element). Rather try

EventCal(end+1,:) = [1, 3]

Here the : refers to all the columns which in your case is 2. Hence 1 row (end+1 is a single number) and 2 columns thus exactly matching the dimensions of your 2-by*1* matrix you are trying to append.

Also, if performance isn't a major issue, you can also use matrix concatenation (but this is less efficient than the indexing approach):

EventCal = [EventCal; [1,3]]

Upvotes: 1

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