[SciPy-user] Concatenating 1D arrays
Robert Kern
robert.kern at gmail.com
Wed Feb 8 11:26:25 CST 2006
Rudolph van der Merwe wrote:
> What is the Numpy prefered way of recursively concatenating 1D arrays
> (vectors) into a 2D array (matrix)?
>
> I'm trying to convert the following Matlab code to Python:
>
> x=[];
> y=[];
> for k=1:N,
> c = get_column_vector_from_somewhere()
> r = get_row_vector_from_somewhere()
> x = [x c]
> y = [y; r]
> end
Assuming that you don't actually know N (in which case Johannes' second example
is appropriate),
x = []
y = []
while have_more_vectors():
x.append(get_column_vector_from_somewhere())
y.append(get_row_vector_from_somewhere())
x = hstack(x)
y = vstack(y)
--
Robert Kern
robert.kern at gmail.com
"In the fields of hell where the grass grows high
Are the graves of dreams allowed to die."
-- Richard Harter
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