using Numeric in C++

[GujuBoy]

I have made a program in "Python" which imports Numeric and calls the
function

ones_array = Numeric.ones(blah,blah)

i see that C++ has a <numeric> library and i was wondering where the
"ones" function is ... in that library...

please help

 

[John Carson]

I have made a program in "Python" which imports Numeric and calls the
function

ones_array = Numeric.ones(blah,blah)

i see that C++ has a <numeric> library and i was wondering where the
"ones" function is ... in that library...

Since this is not a Python group, perhaps you would like to tell us what the
"ones" function does. I would not assume that the common use of the word
"numeric" implies common functionality between Python and the C++ library.

 

[reidarok]

The 'ones'-function in Numeric creates a new array of a given
size/dimension and fills it with the value '1'.

A simple C++ version of this code could be the following:

#import <cstring>

double [] ones_array = new double[blah] // initialize an array with
'blah' length
memset(ones_array, 1, sizeof(double))

If you want a more advanced array class, you might want to take a look
at the STL vector-class.

 

[Alf P. Steinbach]

* (e-mail address removed):

[mostly incoherent]

The 'ones'-function in Numeric creates a new array of a given
size/dimension and fills it with the value '1'.

There is no 'ones' function and there is no Numeric in standard C++.

A simple C++ version of this code could be the following:

#import <cstring>

This is not standard C++.

double [] ones_array = new double[blah] // initialize an array with

This is not standard C++.

memset(ones_array, 1, sizeof(double))

This is Undefined Behavior.

If you want a more advanced array class, you might want to take a look
at the STL vector-class.

That's good advice.

 

[Pete Becker]

The 'ones'-function in Numeric creates a new array of a given
size/dimension and fills it with the value '1'.

A simple C++ version of this code could be the following:

#import <cstring>

double [] ones_array = new double[blah] // initialize an array with
'blah' length
memset(ones_array, 1, sizeof(double))

double *ones_array = new double[blah];
fill(ones_array, ones_array + blah, 1.0);
or:
fill_n(ones_array, blah, 1.0);