Why do I get: "Error using vertcat Dimensions of matrices being concatenated are not consistent."

I have a vector, which should be splitted at certain points (if condition). The parts of the vector should emerge as column in a matrix. In a for-loop I want to establish the new matrix step by step. I have made some preallocation, but I still get an error message. Can someone help me? Here is my code:

Entire = zeros (d,e);     %preallocation

for b = 1: lengthRS

      if trigger (b,1) ==1 && trigger (b+1) == 1;     %condition for splitting

          single  = ERGsignal(b:b+d,1);   %make single part of vector (ERGsignal)

          Entire = [Entire; single];     %Building up Matrix

      end
  end

[Stephen23]

Note that it is a bad idea to name a variable |single, as this is the name of the inbuilt function single.

Answer 1

[Torsten]

Does this work ?

Entire = [];

for b = 1: lengthRS

        if trigger (b,1) ==1 && trigger (b+1,1) == 1;     %condition for splitting
            single  = ERGsignal(b:b+d,1);   %make single part of vector (ERGsignal)
            Entire = horzcat(Entire, single);     %Building up Matrix
        end
    end

Best wishes

Torsten.

[Stephen23]

Note that it is a bad idea to name a variable single, as this is the name of the inbuilt function single.

[Sarah]

Thank you so much, Torsten! This was exactly what I was looking for! :)

Answer 2

[James Tursa]

Entire has e columns

single has 1 column

So unless e == 1, they won't match and hence the error. That being said, it looks like maybe you intended to build up Entire by columns instead of rows. If so, use a comma instead of a semi-colon when attaching "single" (and adjust the size of Entire accordingly).

"single" is an extremely poor choice for a variable name btw since it matches a MATLAB class name. I would advise choosing a different name for this variable.

[Sarah]

Thank you for your answer. You are right, my variables were translated rather imprudently.