[Solved] Error: invalid types ‘int [200][float]’ for array subscript

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So from the comments: if col is float col[H][W];, your trying to index vx/vy via a float. You would have to cast to int again:

int vx2 = vx[static_cast<int>(col[iposy][iposx])];
int vy2 = vy[static_cast<int>(col[iposy][iposx])];

Be careful: There is no implicit index checking, so if your floats are out of range (negative or > WIDTH/HEIGHT), you most probably run into a segmentation fault…

solved Error: invalid types ‘int [200][float]’ for array subscript