Default value Initialization

[dr clueless]

Hi there
After creating a twodimensional array of the form

double** psimilarity = new double*[doccount];
for (int i = 0; i < doccount ; ++i)
psimilarity[i] = new double[doccount];
similarity = psimilarity;

VC++.Net initializes every arrayvalue with the same value to the power of minus 63. But my goal is to have every value being initialized to 0.0.
I tried

memset(similarity,0,sizeof(double)*doccount*doccount);

but then the programm crashes half the time.

I should point out, that the programm is very performance sensitive (wich isnt :rolleyes: )

Thank you

[xenonex]

i'm not sure i understand what you asking for, but what i think is you want to set every index of the array to the same memory location? if that is what you are trying to do it is impossible. it defies the logic of how an array works. the index increments along the bits based on the size of the datatype definition for that array. index 3 for instance would be (3 *double), and would increment that many bits from the array pointer initial memory address. otherwise i don't understand what you are asking and i apologize for wasting your time.

[Danny]

people hate it when I say this, but if you want to allocate an array and make sure that it's zero initialized, use calloc(), not new. calloc ensures zero-initialization of the allocated elements. Of course, use free() to release it afterwards.