segmentation fault while running C code-CodePudding

I am getting a segmentation fault while running following code :

void convert_fix2float(vector<int8_t*>& resultin, vector<vector<float>>& resultout, const float* output_scale){
    
    cout<<"entering fix to float"<<endl;    
    for (size_t ii = 0; ii < 3; ii  ) {
    size_t width = shapes.outTensorList[ii].width;
    size_t height = shapes.outTensorList[ii].height;
    size_t channel = shapes.outTensorList[ii].channel;
    size_t sizeOut = channel * width * height;
    for (size_t j = 0; j < sizeOut; j  ){
        resultout[ii][j] = resultin[ii][j] * output_scale[ii];
    }
}

cout<<"exiting fix to float"<<endl;

}

If I comment out the statement

    resultout[ii][j] = resultin[ii][j] * output_scale[ii];

segmentation fault disappears. Can someone help me please to identify the cause of the issue.

CodePudding user response：

Segmentation failt just means that no memory was prepared. So one of your elements

resultout
resultin
output_scale

can not be accessed, because no valid memory is accesible at this position.

CodePudding user response：

Operator operator[]() in std::vector can not create new elements. For creating new elements you can use method insert():

resultout.insert(std::vector<float>())
for (size_t j = 0; j < sizeOut; j  )
{
        resultout[ii].insert(resultin[ii][j] * output_scale[ii]);
}