what is wrong with my code? vertcat error

t = [0:0.4:40];

a = [20.*sin(t); 20.*cos(t); 0];

b = [0; 0; (10-((t.^2)/16))];

s = a+b

It gives me: Error using vertcat Dimensions of matrices being concatenated are not consistent. what is wrong?

[Stephen23]

You are trying to concatenate vectors with different numbers of columns:

>> size(t)
ans =
     1   101
>> size(0)
ans =
   1   1

t has 101 columns (as do sin and cos outputs too), whereas 0 has one column. It is not possible to vertically concatenate arrays with different numbers of columns.

Answer 1

[M]

You are trying to define a matrix that can not exist.

In your case, t is a vector of dimension 101

size(t)
ans =

     1   101

and so is

20.*sin(t)

but when you write

a = [20.*sin(t); 20.*cos(t); 0];

0 is a scalar of dimension

What you should do is have a look at the function

zeros(M,N) or zeros([M,N]) is an M-by-N matrix of zeros.

Answer 2

[Rik]

The dimensions of matrices being concatenated are not consistent. t is a row-vector, 0 is not.

Apart from that, a will have 203 elements, while b will have only 103 elements, so a+b will fail.

Answer 3

[Puneet]

A_trans = (T * [A; 1])';

Error using vertcat

[DGM]

You're trying to concatenate an array A, and the scalar 1. A has more than one column.