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how to scan lines vertically?

Hi, Currently im scanning lines in a binary image. The thing is i wanted to scan vertically yet i only found out that the for loop is only scanning it vertically. Here is the example of the code. Is there any way that i could scan the image vertically? I did swap the x and y together with rows and cols but it does not work.

for( int y=0; y< frame_gray.rows; y+=10){
for (int x=0;x< frame_gray.cols;x+=1){

if (frame_gray.at<uchar>(y,x)==0)
{  cout << "0 binary=" << endl;}

else
{  cout << "1 binary=" << endl;}
//waitKey(0);

}

cout << "new pixel line" << endl;
}