Select an area in the heatmap
whether mark the selected area as a rectangle
Users can use mouse to click two positions on the heatmap, the function will return the row index and column index for the selected region in the selected matrix.
This function only works under interactive graphical environment.
A list containing row index and column index corresponding to the selected region.
Zuguang Gu <[email protected]>
# No example for this function NULL
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