re-formatting a matrix

This is a simplistic example of a problem I am facing:

depth = [0:1:20]';
data = rand(1,length(depth))';

d = [depth,data];
d = [d;d;d];

Consider the matrix 'd'. Here we have depth in the first column followed by temperature measurements recorded at that depth in column 2 (in this example we have 3 days of data). How could I alter this matrix so that each column represents a specific depth and each row represents time. So, finally I should have 3 rows with 21 columns (hence I do not need the column of depths).

Answer 1

[Andrei Bobrov]

dout  = reshape(d(:,2),numel(depth),[]).';

Answer 2

[Daniel Shub]

First lets create some dummy data. I am intentionally creating it in a non-optimal manner

depth = [0:1:20]';
data1 = rand(length(depth), 1);
data2 = rand(length(depth), 1);
data3 = rand(length(depth), 1);

You can then do

d = [depth, data1, data2, data3]

A better way to generate the data would be

data(:, 1) = rand(length(depth), 1);
data(:, 2) = rand(length(depth), 1);
data(:, 3) = rand(length(depth), 1);

and then

d = [depth, data]

You could of course do

data = rand(length(depth), 3);

but this probably doesn't work with your work flow of how you have the actual data saved.