On Tue, Jun 23, 2009 at 8:58 PM, CLOSE Dave
<address@hidden> wrote:
I asked:
> I want to join two arrays to make a bigger array.
Judd Storrs answered:
> I think should [ A B ] work.
Ok, thanks; I missed the space separator. I was using a comma. But, as
you can probably guess, this is just the latest frustration with a more
complex task. Here's an outline of the whole problem.
Given a CSV file with 15 columns, I want to create a new CSV file with
the first column identical to the first column of the existing file and
a single additional column equal to a convolution of one of the other
columns of the existing file. Diagrammatically,
FileA = Time, H2,H3,H4,.. FileB = Time, Hx
00:05,01,02,03,.. ==> 00:05,11
00:10,04,05,06,.. 00:10,12
00:15,07,08,09,.. 00:15,13
(The numbers aren't real, just made up for this example. But the first
column is a time of day string, not a simple number. It actually
contains a date as well.)
I can read in FileA with << A = csv2cell ( "FileA" ); >> and extract
just the first column with << T = A ( :, 1 ); >>. I can read it in again
with << B = dlmread ( "FileA", "," ); >> and perform my convolution on
column 2 like this,
f = # some formula;
r = rows ( B );
C1 = conv ( B(2:r,2), f );
C2 = rot90 ( C1 );
Now I need to join T and C2 to produce a new array, presumably a cell
array which I can write out with cell2csv(). But I also need to add a
heading to the C2 column. When I try << C2 = { "Hx" rot90(C1) }; >>, I
get the aforementioned array of arrays, even using a space rather than a
comma.