Why am I receiving an error message in an array calculation?

I'm having some difficulty performing an array calculation. I would like to fill the contents of column 3 based on a specific formula using the contents of columns 1 and 2. I have some example code below.

% Example data.
column1data = [231.3 228.8 237.5 222.5]';
column2data = [107.5 121.3 108.8 111.3]';

% I want to create an addtional 3 columns so I end up with a 4 x 5 array.
% I first create a vector that is the same length as vectors 1 and 2.
lendata = length(column1data);

% I then create three additional vectors (columns) of zeros and join all together.
column3 = zeros(1, lendata)';
column4 = zeros(1, lendata)';
column5 = zeros(1, lendata)';
array = [column1data column2data column3 column4 column5];

Once I've created the array, I want to use the below formula to return 4 values in column 3.

array(:, 3) = (81*9.81)*(3.14/2)*((array(:, 2)/array(:, 1)) + 1);

However, I get an error message returned. Can someone please advise what I'm missing?

Thank you.

Answer 1

[Walter Roberson]

use ./ not /

[Benjamin Horsley]

Well, I feel silly! Thank you, @Walter Roberson.