On 6/8/07, Charles R Harris <[EMAIL PROTECTED]> wrote:
On 6/8/07, Mathew Yeates <[EMAIL PROTECTED]> wrote: > > Hi > I'm looking for a more elegant way of setting my array elements > Using "for" loops it would be > for i in range(rows): > for j in range(cols): > N[i,j] = N[i-1][j] + N[i][j-1] - N[i-1][j-1] If the initial values of the recursion are in the first row and column you can use the result: N[i,j] = N[0,j] + N[i,0]. It's like the PDE D_xD_y N = 0 whose solution is the sum of two functions f(x) + g(y). It gets more complicated if you are looking for a more general result. Chuck
Make that N[i,j] = N[0,j] + N[i,0] - N[0,0]. Chuck
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