Undefined function 'concat' for input arguments of type 'double'.

I am getting this error while running the following code. 'Undefined function 'concat' for input arguments of type 'double'.'

load train.mat; y1=y; load handel.mat; y2=y; load gong.mat; y3=y; concat(y1,y2,y3);

Answer 1

[TADA]

The error message pretty much sums it up. You can't concat arguments of type double.

If you are trying to create a vector, use either the bracket syntax

 v1 = [y1, y2, y3] % for a row vector (commas aren't mandatory)
 v2 = [y1; y2; y3] % for column vector (semicolons are mandatory)

or you can use the equivalent functions vertcat or horzcat

If you're trying to generate a string, you must first convert them to strings

 str = strcat(num2str(y1), num2str(y2), num2str(y3));
 % or use brackets to concat the character vectors
 str = [num2str(y1), num2str(y2), num2str(y3)] % again commas aren't necessary
 % or the equivalent function call:
 str = horzcat(num2str(y1), num2str(y2), num2str(y3));