Please help me an error occur

A=[1:5;6:-0.2:5.2;13 4 - 3 1 30;x 4 9]

Error using vertcat

Dimensions of arrays being concatenated are not consistent

WHat should i do to remove that error

Answer 1

[Steven Lord]

Let's look at each of the terms you're trying to concatenate together.

term1 = 1:5

term1 = 1×5

1 2 3 4 5

term2 = 6:-0.2:5.2

term2 = 1×5

6.0000 5.8000 5.6000 5.4000 5.2000

term3 = [13 4 - 3 1 30]

term3 = 1×4

13 1 1 30

% term4 = [x 4 9]

The space around the minus sign in term3 makes MATLAB treat that part as (4-3) not [4, -3] as I suspect you intended. I recommend separating the elements in that term with commas to clearly indicate to MATLAB where each element begins and ends.

term3 = [13, 4, - 3, 1, 30]

term3 = 1×5

13 4 -3 1 30

For your fourth term, that will be a 1-by-5 vector as well if x is a 1-by-3 vector. You haven't shown us x so I can't tell if that will also be a problem in creating your matrix.