PythonQ 240-8XX Manuale Utente Scaricare il pdf (Pagina 15)

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Basic array indexing

Note: all integer indices in Python start at 0!

a=linspace(-1,1,6)

a[2:4] = -1 # set a[2] and a[3] equal to -1

a[-1] = a[0] # set last element equal to first one

a[:] = 0 # set all elements of a equal to 0

a.fill(0) # set all elements of a equal to 0

a.shape = (2,3) # turn a into a 2x3 matrix

print a[0,1] # print element (0,1)

a[i,j] = 10 # assignment to element (i,j)

a[i][j] = 10 # equivalent syntax (slower)

print a[:,k] # print column with index k

print a[1,:] # print second row

a[:,:] = 0 # set all elements of a equal to 0

Numerical Python – p. 249/728

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PythonQ 240-8XX Manuale Utente Pagina 15