How to access elements in numpy.array without converting the array?

Hello all,

I'm using an outofprocess python enviornment and would like to access individual or a set of elements in a numpy array without converting it. For example.

NP = py.importlib.import_module('numpy');

x = NP.array([1 3 5 7 9 11]);

now I would like to change x(2) to 0, this is what I do now and is clearly not efficient for very large arrays in a for loop for example.

tmp = double(x);

tmp(2) = 0;

x = NP.array(tmp);

my ultimate goal is to be able to take change a set of elements eg. 3:4, or 2:2:6

Thank you for your help

Answer 1

[Al Danial]

Use NumPy's put() function:

>> NP = py.importlib.import_module('numpy');

>> x = NP.array([1 3 5 7 9 11]);

>> ind = int64([0 2]); % indices to 1st and 3rd elements

>> newvals = [-11 -55]; % new values for 1st and 3rd elements

>> NP.put(x, ind, newvals);

>> x

x =

Python ndarray:

-11 3 -55 7 9 11

Use details function to view the properties of the Python object.

Use double function to convert to a MATLAB array.

[Robert]

Perfect, thank you.