Hi Sayan,
On 27 March 2013 16:31, Sayan Chatterjee <sayanchatter...@gmail.com> wrote:
> p_za = [None]*N is not giving away the error message.
>
> for i in range(0,N):
> p_za.append = p_initial[i] + t*K*cos(K*p_initial[i]); is also not
> working.
>
append() is a method, so using append you want something like:
for i in range(0,N):
p_za.append( p_initial[i] + t*K*cos(K*p_initial[i]) );
After every loop iteration, the list grows by having one item appended to
it, being the result of the expression: p_initial[i] +
t*K*cos(K*p_initial[i])
> Could you please redirect me to a link where the example is demonstrated?
>
http://courses.cms.caltech.edu/cs11/material/python/misc/python_idioms.html
See the paragraph on "Sequence multiplication".
> What is the simplest way to assign an array element a value?
>
What you have is fine for assignment to a particular slot in the list.
What you've missed and has already been pointed out, is to initialise/set
the length of your list first, before trying to set the value of arbitrary
slots. In the C example you posted the array is declared with length 200
up front. In your Python code however you assign [], which is a list of
length 0. By contrast, the expression I gave you before, e.g. [None] * N,
generates a list of length N, with each element in the list being the None
object, thus initialising the list, ensuring that you can later assign to
arbitrary slots when needed.
Walter
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